The getFloat64() method gets a signed 64-bit float (double) at the specified byte offset from the start of the DataView.


dataview.getFloat64(byteOffset [, littleEndian])


The offset, in byte, from the start of the view where to read the data.
Optional Indicates whether the 64-bit float is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

Return value

A signed 64-bit float number.

Errors thrown

Thrown if the byteOffset is set such as it would read beyond the end of the view.


There is no alignment constraint; multi-byte values may be fetched from any offset.


Using the getFloat64 method

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getFloat64(1); // 0


Specification Status Comment
Typed Array Specification Obsolete Superseded by ECMAScript 6.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'DataView.prototype.getFloat64' in that specification.
Standard Initial definition in ECMA standard.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'DataView.prototype.getFloat64' in that specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9.0 15.0 (15.0) 10 12.1 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.0 (Yes) 15.0 (15) ? 12.0 4.2

See also

Document Tags and Contributors

 Contributors to this page: ibratoev, eduardoboucas, fscholz
 Last updated by: ibratoev,