# Precision
> Effective number of bits in the [significand][significand] of a [double-precision floating-point number][ieee754].
## Usage
```javascript
var FLOAT64_PRECISION = require( '@stdlib/constants/float64/precision' );
```
#### FLOAT64_PRECISION
Effective number of bits in the [significand][significand] of a [double-precision floating-point number][ieee754].
```javascript
var bool = ( FLOAT64_PRECISION === 53 ); // including implicit bit
// returns true
```
## Examples
```javascript
var FLOAT64_PRECISION = require( '@stdlib/constants/float64/precision' );
console.log( FLOAT64_PRECISION );
// => 53
```
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[significand]: https://en.wikipedia.org/wiki/Significand