The baseLatency read-only property of the AudioContext interface returns a double that represents the number of seconds of processing latency incurred by the AudioContext passing an audio buffer from the AudioDestinationNode — i.e. the end of the audio graph — into the host system's audio subsystem ready for playing.

Note: You can request a certain latency during construction time with the latencyHint option, but the browser may ignore the option.


var baseLatency = audioCtx.baseLatency;


A double representing the base latency in seconds.


// default latency ("interactive")
const audioCtx1 = new AudioContext();
console.log(audioCtx1.baseLatency); // 0.00

// higher latency ("playback")
const audioCtx2 = new AudioContext({ latencyHint: 'playback' });
console.log(audioCtx2.baseLatency); // 0.15


Specification Status Comment
Web Audio API
The definition of 'baseLatency' in that specification.
Working Draft Initial definition.

Browser Compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 58Edge Full support 79Firefox Full support 70IE No support NoOpera Full support 45Safari No support NoWebView Android Full support 58Chrome Android Full support 58Firefox Android No support NoOpera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0


Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also