diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_Parse_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_Parse_test.res
index 168be4d8..3f1baf12 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_Parse_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_Parse_test.res
@@ -251,6 +251,13 @@ describe("Peggy parse", () => {
       "{(::map (::$_constructArray_$ (1 2 3)) {|:x| {(::add :x 1)}})}",
     )
   })
+  describe("unit", () => {
+    testParse("1m", "{(::multiply 1 (::$valueOfUnit 'm'))}")
+    testParse(
+      "1m+2cm",
+      "{(::add (::multiply 1 (::$valueOfUnit 'm')) (::multiply 2 (::$valueOfUnit 'cm')))}",
+    )
+  })
 })
 
 describe("parsing new line", () => {
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
index 81bafd97..fa6c58f9 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_test.res
@@ -217,4 +217,8 @@ describe("Peggy to Expression", () => {
       (),
     )
   })
+
+  describe("unit", () => {
+    testToExpression("1m", "(:$$_block_$$ (:multiply 1 (:$valueOfUnit 'm')))", ~v="1", ())
+  })
 })
diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
index 141b4a37..1ab8d559 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
@@ -129,6 +129,23 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
     )
   }
 
+  let doValueOfUnit = (aUnit: string) =>
+    switch aUnit {
+    | "nm" => 0.000000001->EvNumber->Ok
+    | "um" => 0.000001->EvNumber->Ok
+    | "mm" => 0.001->EvNumber->Ok
+    | "cm" => 0.01->EvNumber->Ok
+    | "dm" => 0.1->EvNumber->Ok
+    | "m" => 1.->EvNumber->Ok
+    | "dam" => 10.->EvNumber->Ok
+    | "hm" => 100.->EvNumber->Ok
+    | "km" => 1000.->EvNumber->Ok
+    | "Mm" => 1000000.->EvNumber->Ok
+    | "Gm" => 1000000000.->EvNumber->Ok
+    | "Tm" => 1000000000000.->EvNumber->Ok
+    | _ => REUnitNotFound(aUnit)->Error
+    }
+
   switch call {
   | ("$_atIndex_$", [EvArray(aValueArray), EvNumber(fIndex)]) => arrayAtIndex(aValueArray, fIndex)
   | ("$_atIndex_$", [EvRecord(dict), EvString(sIndex)]) => recordAtIndex(dict, sIndex)
@@ -137,6 +154,7 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
   | ("$_exportBindings_$", [EvRecord(externalBindings)]) => doExportBindings(externalBindings)
   | ("$_setBindings_$", [EvRecord(externalBindings), EvSymbol(symbol), value]) =>
     doSetBindings(externalBindings, symbol, value)
+  | ("$valueOfUnit", [EvString(aUnit)]) => doValueOfUnit(aUnit)
   | ("inspect", [value, EvString(label)]) => inspectLabel(value, label)
   | ("inspect", [value]) => inspect(value)
   | ("keep", [EvArray(aValueArray), EvLambda(aLambdaValue)]) =>
diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_ErrorValue.res b/packages/squiggle-lang/src/rescript/Reducer/Reducer_ErrorValue.res
index fc2f86f1..721fbc40 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_ErrorValue.res
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_ErrorValue.res
@@ -4,18 +4,19 @@ type errorValue =
   | REArrayIndexNotFound(string, int)
   | REAssignmentExpected
   | REDistributionError(DistributionTypes.error)
-  | REOperationError(Operation.operationError)
+  | REExpectedType(string)
   | REExpressionExpected
   | REFunctionExpected(string)
   | REFunctionNotFound(string)
   | REJavaScriptExn(option<string>, option<string>) // Javascript Exception
   | REMacroNotFound(string)
   | RENotAFunction(string)
+  | REOperationError(Operation.operationError)
   | RERecordPropertyNotFound(string, string)
   | RESymbolNotFound(string)
   | RESyntaxError(string)
   | RETodo(string) // To do
-  | REExpectedType(string)
+  | REUnitNotFound(string)
 
 type t = errorValue
 
@@ -52,4 +53,5 @@ let errorToString = err =>
   | RESyntaxError(desc) => `Syntax Error: ${desc}`
   | RETodo(msg) => `TODO: ${msg}`
   | REExpectedType(typeName) => `Expected type: ${typeName}`
+  | REUnitNotFound(unitName) => `Unit not found: ${unitName}`
   }
diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js
index 3a34dfb2..4c1532dd 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js
@@ -538,32 +538,42 @@ function peg$parse(input, options) {
   var peg$f27 = function (characters) {
     return nodeString(characters.join(""));
   };
-  var peg$f28 = function () {
-    return nodeInteger(parseInt(text()));
+  var peg$f28 = function (number, unit) {
+    if (unit === null) {
+      return number;
+    } else {
+      return makeFunctionCall("multiply", [
+        number,
+        makeFunctionCall("$valueOfUnit", [nodeString(unit.value)]),
+      ]);
+    }
   };
   var peg$f29 = function () {
-    return nodeFloat(parseFloat(text()));
+    return nodeInteger(parseInt(text()));
   };
   var peg$f30 = function () {
+    return nodeFloat(parseFloat(text()));
+  };
+  var peg$f31 = function () {
     return nodeBoolean(text() === "true");
   };
-  var peg$f31 = function (args, statements, finalExpression) {
+  var peg$f32 = function (args, statements, finalExpression) {
     statements.push(finalExpression);
     return nodeLambda(args, nodeBlock(statements));
   };
-  var peg$f32 = function (args, finalExpression) {
+  var peg$f33 = function (args, finalExpression) {
     return nodeLambda(args, nodeBlock([finalExpression]));
   };
-  var peg$f33 = function () {
+  var peg$f34 = function () {
     return makeFunctionCall("$_constructArray_$", [nodeExpression([])]);
   };
-  var peg$f34 = function (args) {
+  var peg$f35 = function (args) {
     return makeFunctionCall("$_constructArray_$", [nodeExpression(args)]);
   };
-  var peg$f35 = function (args) {
+  var peg$f36 = function (args) {
     return makeFunctionCall("$_constructRecord_$", [nodeExpression(args)]);
   };
-  var peg$f36 = function (key, value) {
+  var peg$f37 = function (key, value) {
     return nodeKeyValue(key, value);
   };
 
@@ -738,7 +748,7 @@ function peg$parse(input, options) {
   function peg$parsestart() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 0;
+    var key = peg$currPos * 68 + 0;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -771,7 +781,7 @@ function peg$parse(input, options) {
   function peg$parsezeroOMoreArgumentsBlockOrExpression() {
     var s0;
 
-    var key = peg$currPos * 67 + 1;
+    var key = peg$currPos * 68 + 1;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -793,7 +803,7 @@ function peg$parse(input, options) {
   function peg$parseouterBlock() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 2;
+    var key = peg$currPos * 68 + 2;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -846,7 +856,7 @@ function peg$parse(input, options) {
   function peg$parseinnerBlockOrExpression() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 3;
+    var key = peg$currPos * 68 + 3;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -874,7 +884,7 @@ function peg$parse(input, options) {
   function peg$parsequotedInnerBlock() {
     var s0, s1, s2, s3, s4, s5, s6;
 
-    var key = peg$currPos * 67 + 4;
+    var key = peg$currPos * 68 + 4;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -991,7 +1001,7 @@ function peg$parse(input, options) {
   function peg$parsearray_statements() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 5;
+    var key = peg$currPos * 68 + 5;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1046,7 +1056,7 @@ function peg$parse(input, options) {
   function peg$parsestatement() {
     var s0;
 
-    var key = peg$currPos * 67 + 6;
+    var key = peg$currPos * 68 + 6;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1068,7 +1078,7 @@ function peg$parse(input, options) {
   function peg$parseletStatement() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 7;
+    var key = peg$currPos * 68 + 7;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1109,7 +1119,7 @@ function peg$parse(input, options) {
   function peg$parsedefunStatement() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10;
 
-    var key = peg$currPos * 67 + 8;
+    var key = peg$currPos * 68 + 8;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1186,7 +1196,7 @@ function peg$parse(input, options) {
   function peg$parseassignmentOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 9;
+    var key = peg$currPos * 68 + 9;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1221,7 +1231,7 @@ function peg$parse(input, options) {
   function peg$parsearray_parameters() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 10;
+    var key = peg$currPos * 68 + 10;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1300,7 +1310,7 @@ function peg$parse(input, options) {
   function peg$parseexpression() {
     var s0;
 
-    var key = peg$currPos * 67 + 11;
+    var key = peg$currPos * 68 + 11;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1325,7 +1335,7 @@ function peg$parse(input, options) {
   function peg$parseifthenelse() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11;
 
-    var key = peg$currPos * 67 + 12;
+    var key = peg$currPos * 68 + 12;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1439,7 +1449,7 @@ function peg$parse(input, options) {
   function peg$parseternary() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
 
-    var key = peg$currPos * 67 + 13;
+    var key = peg$currPos * 68 + 13;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1513,7 +1523,7 @@ function peg$parse(input, options) {
   function peg$parselogicalAdditive() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 14;
+    var key = peg$currPos * 68 + 14;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1578,7 +1588,7 @@ function peg$parse(input, options) {
   function peg$parselogicalAdditiveOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 15;
+    var key = peg$currPos * 68 + 15;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1613,7 +1623,7 @@ function peg$parse(input, options) {
   function peg$parselogicalMultiplicative() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 16;
+    var key = peg$currPos * 68 + 16;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1678,7 +1688,7 @@ function peg$parse(input, options) {
   function peg$parselogicalMultiplicativeOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 17;
+    var key = peg$currPos * 68 + 17;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1713,7 +1723,7 @@ function peg$parse(input, options) {
   function peg$parseequality() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 18;
+    var key = peg$currPos * 68 + 18;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1757,7 +1767,7 @@ function peg$parse(input, options) {
   function peg$parseequalityOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 19;
+    var key = peg$currPos * 68 + 19;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1803,7 +1813,7 @@ function peg$parse(input, options) {
   function peg$parserelational() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 20;
+    var key = peg$currPos * 68 + 20;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1847,7 +1857,7 @@ function peg$parse(input, options) {
   function peg$parserelationalOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 21;
+    var key = peg$currPos * 68 + 21;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1915,7 +1925,7 @@ function peg$parse(input, options) {
   function peg$parseadditive() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 22;
+    var key = peg$currPos * 68 + 22;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -1980,7 +1990,7 @@ function peg$parse(input, options) {
   function peg$parseadditiveOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 23;
+    var key = peg$currPos * 68 + 23;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2048,7 +2058,7 @@ function peg$parse(input, options) {
   function peg$parsemultiplicative() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 24;
+    var key = peg$currPos * 68 + 24;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2113,7 +2123,7 @@ function peg$parse(input, options) {
   function peg$parsemultiplicativeOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 25;
+    var key = peg$currPos * 68 + 25;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2181,7 +2191,7 @@ function peg$parse(input, options) {
   function peg$parsepower() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 26;
+    var key = peg$currPos * 68 + 26;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2246,7 +2256,7 @@ function peg$parse(input, options) {
   function peg$parsepowerOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 27;
+    var key = peg$currPos * 68 + 27;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2292,7 +2302,7 @@ function peg$parse(input, options) {
   function peg$parsecredibleInterval() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 28;
+    var key = peg$currPos * 68 + 28;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2377,7 +2387,7 @@ function peg$parse(input, options) {
   function peg$parsecredibleIntervalOp() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 29;
+    var key = peg$currPos * 68 + 29;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2412,7 +2422,7 @@ function peg$parse(input, options) {
   function peg$parsechainFunctionCall() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 30;
+    var key = peg$currPos * 68 + 30;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2515,7 +2525,7 @@ function peg$parse(input, options) {
   function peg$parsechainedFunction() {
     var s0, s1, s2, s3, s4, s5, s6;
 
-    var key = peg$currPos * 67 + 31;
+    var key = peg$currPos * 68 + 31;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2627,7 +2637,7 @@ function peg$parse(input, options) {
   function peg$parseunary() {
     var s0, s1, s2, s3;
 
-    var key = peg$currPos * 67 + 32;
+    var key = peg$currPos * 68 + 32;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2667,7 +2677,7 @@ function peg$parse(input, options) {
   function peg$parseunaryOperator() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 33;
+    var key = peg$currPos * 68 + 33;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2724,7 +2734,7 @@ function peg$parse(input, options) {
   function peg$parseindexedValue() {
     var s0;
 
-    var key = peg$currPos * 67 + 34;
+    var key = peg$currPos * 68 + 34;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -2749,7 +2759,7 @@ function peg$parse(input, options) {
   function peg$parsecollectionElement() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10;
 
-    var key = peg$currPos * 67 + 35;
+    var key = peg$currPos * 68 + 35;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3051,7 +3061,7 @@ function peg$parse(input, options) {
   function peg$parsearray_functionArguments() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 36;
+    var key = peg$currPos * 68 + 36;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3130,7 +3140,7 @@ function peg$parse(input, options) {
   function peg$parserecordElement() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
 
-    var key = peg$currPos * 67 + 37;
+    var key = peg$currPos * 68 + 37;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3246,7 +3256,7 @@ function peg$parse(input, options) {
   function peg$parseatom() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 38;
+    var key = peg$currPos * 68 + 38;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3306,7 +3316,7 @@ function peg$parse(input, options) {
   function peg$parsebasicValue() {
     var s0;
 
-    var key = peg$currPos * 67 + 39;
+    var key = peg$currPos * 68 + 39;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3328,7 +3338,7 @@ function peg$parse(input, options) {
   function peg$parsebasicLiteral() {
     var s0;
 
-    var key = peg$currPos * 67 + 40;
+    var key = peg$currPos * 68 + 40;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3339,14 +3349,11 @@ function peg$parse(input, options) {
 
     s0 = peg$parsestring();
     if (s0 === peg$FAILED) {
-      s0 = peg$parsefloat();
+      s0 = peg$parsenumber();
       if (s0 === peg$FAILED) {
-        s0 = peg$parseinteger();
+        s0 = peg$parseboolean();
         if (s0 === peg$FAILED) {
-          s0 = peg$parseboolean();
-          if (s0 === peg$FAILED) {
-            s0 = peg$parsedollarIdentifier();
-          }
+          s0 = peg$parsedollarIdentifier();
         }
       }
     }
@@ -3359,7 +3366,7 @@ function peg$parse(input, options) {
   function peg$parseidentifier() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 41;
+    var key = peg$currPos * 68 + 41;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3447,7 +3454,7 @@ function peg$parse(input, options) {
   function peg$parsedollarIdentifier() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 42;
+    var key = peg$currPos * 68 + 42;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3535,7 +3542,7 @@ function peg$parse(input, options) {
   function peg$parsestring() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 43;
+    var key = peg$currPos * 68 + 43;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3676,10 +3683,44 @@ function peg$parse(input, options) {
     return s0;
   }
 
+  function peg$parsenumber() {
+    var s0, s1, s2;
+
+    var key = peg$currPos * 68 + 44;
+    var cached = peg$resultsCache[key];
+
+    if (cached) {
+      peg$currPos = cached.nextPos;
+
+      return cached.result;
+    }
+
+    s0 = peg$currPos;
+    s1 = peg$parsefloat();
+    if (s1 === peg$FAILED) {
+      s1 = peg$parseinteger();
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseidentifier();
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f28(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+    return s0;
+  }
+
   function peg$parseinteger() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 44;
+    var key = peg$currPos * 68 + 45;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3740,7 +3781,7 @@ function peg$parse(input, options) {
         }
         if (s3 !== peg$FAILED) {
           peg$savedPos = s0;
-          s0 = peg$f28();
+          s0 = peg$f29();
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;
@@ -3769,7 +3810,7 @@ function peg$parse(input, options) {
   function peg$parsefloat() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 45;
+    var key = peg$currPos * 68 + 46;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3898,7 +3939,7 @@ function peg$parse(input, options) {
     }
     if (s1 !== peg$FAILED) {
       peg$savedPos = s0;
-      s1 = peg$f29();
+      s1 = peg$f30();
     }
     s0 = s1;
     peg$silentFails--;
@@ -3917,7 +3958,7 @@ function peg$parse(input, options) {
   function peg$parsefloatExponent() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 46;
+    var key = peg$currPos * 68 + 47;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -3979,7 +4020,7 @@ function peg$parse(input, options) {
   function peg$parsed() {
     var s0;
 
-    var key = peg$currPos * 67 + 47;
+    var key = peg$currPos * 68 + 48;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4006,7 +4047,7 @@ function peg$parse(input, options) {
   function peg$parseboolean() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 48;
+    var key = peg$currPos * 68 + 49;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4039,7 +4080,7 @@ function peg$parse(input, options) {
     }
     if (s1 !== peg$FAILED) {
       peg$savedPos = s0;
-      s1 = peg$f30();
+      s1 = peg$f31();
     }
     s0 = s1;
     peg$silentFails--;
@@ -4058,7 +4099,7 @@ function peg$parse(input, options) {
   function peg$parsevalueConstructor() {
     var s0;
 
-    var key = peg$currPos * 67 + 49;
+    var key = peg$currPos * 68 + 50;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4086,7 +4127,7 @@ function peg$parse(input, options) {
   function peg$parselambda() {
     var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12;
 
-    var key = peg$currPos * 67 + 50;
+    var key = peg$currPos * 68 + 51;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4161,7 +4202,7 @@ function peg$parse(input, options) {
                 }
                 if (s12 !== peg$FAILED) {
                   peg$savedPos = s0;
-                  s0 = peg$f31(s5, s9, s10);
+                  s0 = peg$f32(s5, s9, s10);
                 } else {
                   peg$currPos = s0;
                   s0 = peg$FAILED;
@@ -4242,7 +4283,7 @@ function peg$parse(input, options) {
                 }
                 if (s11 !== peg$FAILED) {
                   peg$savedPos = s0;
-                  s0 = peg$f32(s5, s9);
+                  s0 = peg$f33(s5, s9);
                 } else {
                   peg$currPos = s0;
                   s0 = peg$FAILED;
@@ -4277,7 +4318,7 @@ function peg$parse(input, options) {
   function peg$parsearrayConstructor() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 51;
+    var key = peg$currPos * 68 + 52;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4310,7 +4351,7 @@ function peg$parse(input, options) {
       }
       if (s3 !== peg$FAILED) {
         peg$savedPos = s0;
-        s0 = peg$f33();
+        s0 = peg$f34();
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -4346,7 +4387,7 @@ function peg$parse(input, options) {
           }
           if (s5 !== peg$FAILED) {
             peg$savedPos = s0;
-            s0 = peg$f34(s3);
+            s0 = peg$f35(s3);
           } else {
             peg$currPos = s0;
             s0 = peg$FAILED;
@@ -4376,7 +4417,7 @@ function peg$parse(input, options) {
   function peg$parsearray_elements() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 52;
+    var key = peg$currPos * 68 + 53;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4455,7 +4496,7 @@ function peg$parse(input, options) {
   function peg$parserecordConstructor() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 53;
+    var key = peg$currPos * 68 + 54;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4491,7 +4532,7 @@ function peg$parse(input, options) {
         }
         if (s5 !== peg$FAILED) {
           peg$savedPos = s0;
-          s0 = peg$f35(s3);
+          s0 = peg$f36(s3);
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;
@@ -4520,7 +4561,7 @@ function peg$parse(input, options) {
   function peg$parsearray_recordArguments() {
     var s0, s1, s2, s3, s4, s5, s6, s7;
 
-    var key = peg$currPos * 67 + 54;
+    var key = peg$currPos * 68 + 55;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4599,7 +4640,7 @@ function peg$parse(input, options) {
   function peg$parsekeyValuePair() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 67 + 55;
+    var key = peg$currPos * 68 + 56;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4626,7 +4667,7 @@ function peg$parse(input, options) {
         s5 = peg$parseexpression();
         if (s5 !== peg$FAILED) {
           peg$savedPos = s0;
-          s0 = peg$f36(s1, s5);
+          s0 = peg$f37(s1, s5);
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;
@@ -4648,7 +4689,7 @@ function peg$parse(input, options) {
   function peg$parse_() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 56;
+    var key = peg$currPos * 68 + 57;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4678,7 +4719,7 @@ function peg$parse(input, options) {
   function peg$parse_nl() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 57;
+    var key = peg$currPos * 68 + 58;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4714,7 +4755,7 @@ function peg$parse(input, options) {
   function peg$parse__() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 58;
+    var key = peg$currPos * 68 + 59;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4750,7 +4791,7 @@ function peg$parse(input, options) {
   function peg$parse__nl() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 59;
+    var key = peg$currPos * 68 + 60;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4792,7 +4833,7 @@ function peg$parse(input, options) {
   function peg$parsestatementSeparator() {
     var s0, s1, s2, s3;
 
-    var key = peg$currPos * 67 + 60;
+    var key = peg$currPos * 68 + 61;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4860,7 +4901,7 @@ function peg$parse(input, options) {
   function peg$parsecommentOrNewLine() {
     var s0, s1, s2;
 
-    var key = peg$currPos * 67 + 61;
+    var key = peg$currPos * 68 + 62;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4891,7 +4932,7 @@ function peg$parse(input, options) {
   function peg$parsefinalComment() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 67 + 62;
+    var key = peg$currPos * 68 + 63;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4967,7 +5008,7 @@ function peg$parse(input, options) {
   function peg$parsewhiteSpaceCharactersOrComment() {
     var s0;
 
-    var key = peg$currPos * 67 + 63;
+    var key = peg$currPos * 68 + 64;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -4989,7 +5030,7 @@ function peg$parse(input, options) {
   function peg$parsedelimitedComment() {
     var s0, s1, s2, s3;
 
-    var key = peg$currPos * 67 + 64;
+    var key = peg$currPos * 68 + 65;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -5067,7 +5108,7 @@ function peg$parse(input, options) {
   function peg$parsewhiteSpaceCharacters() {
     var s0;
 
-    var key = peg$currPos * 67 + 65;
+    var key = peg$currPos * 68 + 66;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -5094,7 +5135,7 @@ function peg$parse(input, options) {
   function peg$parsenewLine() {
     var s0, s1;
 
-    var key = peg$currPos * 67 + 66;
+    var key = peg$currPos * 68 + 67;
     var cached = peg$resultsCache[key];
 
     if (cached) {
diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy
index 5d3392b3..3b02d85a 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy
@@ -248,8 +248,7 @@ basicValue = valueConstructor / basicLiteral
  
 basicLiteral
   = string
-  / float
-  / integer
+  / number
   / boolean
   / dollarIdentifier
 
@@ -263,6 +262,16 @@ string 'string'
   = characters:("'" @([^'])* "'") {return nodeString(characters.join(''))} 
   / characters:('"' @([^"])* '"') {return nodeString(characters.join(''))}
 
+number = number:(float / integer) unit:identifier?
+  { 
+    if (unit === null)
+      { return number }
+    else
+      { return makeFunctionCall('multiply', 
+          [number, makeFunctionCall('$valueOfUnit', [nodeString(unit.value)])]) 
+      }
+  }
+
 integer 'integer'
   = d+ !"\." ![e]i
   { return nodeInteger(parseInt(text()))}