diff --git a/web/components/amount-input.tsx b/web/components/amount-input.tsx
index d4724c2a..76111b6f 100644
--- a/web/components/amount-input.tsx
+++ b/web/components/amount-input.tsx
@@ -178,9 +178,10 @@ export function SellAmountInput(props: {
   ]
 
   const sellOutcome = yesShares ? 'YES' : noShares ? 'NO' : undefined
-  const shares = yesShares || noShares
+  const shares = Math.round(yesShares) || Math.round(noShares)
+
+  const sharesSold = Math.min(amount ?? 0, shares)
 
-  const sharesSold = Math.min(amount ?? 0, yesShares || noShares)
   const { saleValue } = calculateCpmmSale(
     contract,
     sharesSold,
diff --git a/web/components/bet-panel.tsx b/web/components/bet-panel.tsx
index 677e0197..cff37929 100644
--- a/web/components/bet-panel.tsx
+++ b/web/components/bet-panel.tsx
@@ -432,7 +432,13 @@ export function SellPanel(props: {
       <SellAmountInput
         inputClassName="w-full"
         contract={contract}
-        amount={amount ? Math.floor(amount) : undefined}
+        amount={
+          amount
+            ? Math.round(amount) === 0
+              ? 0
+              : Math.floor(amount)
+            : undefined
+        }
         onChange={setAmount}
         userBets={userBets}
         error={error}