Convert a double-precision floating-point number to the nearest single-precision floating-point number.
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> Convert a [double-precision floating-point number][ieee754] to the nearest [single-precision floating-point number][ieee754].
``bash`
npm install @stdlib/number-float64-base-to-float32
`javascript`
var float64ToFloat32 = require( '@stdlib/number-float64-base-to-float32' );
#### float64ToFloat32( x )
Converts a [double-precision floating-point number][ieee754] to the nearest [single-precision floating-point number][ieee754].
`javascript`
var y = float64ToFloat32( 1.337 );
// returns 1.3370000123977661
- This function may be used as a polyfill for the ES2015 built-in [Math.fround][math-fround].
`javascript
var randu = require( '@stdlib/random-base-randu' );
var float64ToFloat32 = require( '@stdlib/number-float64-base-to-float32' );
var f64;
var f32;
var i;
// Convert random double-precision floating-point numbers to the nearest single-precision floating-point number...
for ( i = 0; i < 1000; i++ ) {
f64 = randu() * 100.0;
f32 = float64ToFloat32( f64 );
console.log( 'float64: %d => float32: %d', f64, f32 );
}
`
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/number-float64-base-to-float32/tree/deno
[deno-readme]: https://github.com/stdlib-js/number-float64-base-to-float32/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/number-float64-base-to-float32/tree/umd
[umd-readme]: https://github.com/stdlib-js/number-float64-base-to-float32/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/number-float64-base-to-float32/tree/esm
[esm-readme]: https://github.com/stdlib-js/number-float64-base-to-float32/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/number-float64-base-to-float32/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/number-float64-base-to-float32/main/LICENSE
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[math-fround]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround