Audio Latency Test Measure Round-Trip Sound Delay

Play safe low-volume chirps through your speaker, detect them with your microphone, and measure the complete acoustic round trip with confidence filtering.

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Acoustic Round-Trip Audio Latency Test

Use speakers and a nearby microphone in a quiet room. One warm-up and five measured trials produce a median, range, MAD jitter, and confidence score.

Before you start

Use speakers at 30-50% system volume in a quiet room. Keep the microphone nearby. The short chirps are intentionally low-volume.

Test setup

Speaker-to-microphone distance cm

Optional air-travel correction. Keep the same distance for comparisons.

Status Ready. Check volume and microphone placement.

Trial quality

Warm-up Pending —
Trial 1 Pending —
Trial 2 Pending —
Trial 3 Pending —
Trial 4 Pending —
Trial 5 Pending —

Round-trip results

Run the test to see measured results.

No saved baseline

Browser and microphone details

Browser base latency: Unavailable
Browser output latency: Unavailable
Capture sample rate: Unavailable
Mic processing: Unavailable

What this number means

The result includes output buffering, the playback device, air travel, microphone input, capture buffering, and browser processing. Browser base/output latency estimates are shown separately.

Local only: microphone samples are analyzed in memory and are never uploaded.

Rate Acoustic Round-Trip Audio Latency Test: 5.0 (1 rating)

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Acoustic Round-Trip Audio Latency Test is a free, browser-based audio testing tool that lets you measure estimated acoustic round-trip audio latency with five correlated chirp trials, confidence checks, jitter, and browser latency estimates.

Cost: Free, no signup
Install: None — runs in the browser
Privacy: Runs locally, no uploads
Platforms: Windows, macOS, Linux, Android, iOS
Time: Under a minute

Measurement workflow

How to test audio latency accurately

This test measures when a scheduled chirp returns through the microphone. A controlled setup matters more than a single fast-looking number.

01 Prepare a quiet room Close calls and music, use the default speaker and microphone, and set system volume around 30 to 50 percent.

02 Place the microphone Keep it about 20 to 50 cm from the speaker and enter that distance if you want the optional air-travel correction.

03 Allow five clean trials Do not speak or move the devices while the warm-up and five low-volume chirps run. Weak or ambiguous detections are rejected.

04 Compare like with like Save a local baseline, change one device or setting, then rerun with the same placement, browser, volume, and room.

The measured value is an acoustic round trip: browser output, speaker, air, microphone, capture, and processing. It is not isolated Bluetooth codec delay or one-way output latency.

Bluetooth audio delay: measure the lag, then fix it

Audio latency FAQ

Audio latency test questions

What does this audio latency test measure?

It measures the estimated acoustic round trip from a browser-scheduled chirp through the output device, air, microphone, capture path, and back into Web Audio processing.

Does it measure Bluetooth latency by itself?

No. Bluetooth may be part of the measured path, but the result also includes the speaker, microphone, operating system, browser, and capture buffers. Some headsets change profiles when their microphone activates.

Why can a trial be rejected?

The tool rejects a trial when the chirp correlation, signal-to-noise ratio, or peak separation is too weak to support a trustworthy timing result. Increase volume slightly, reduce noise, or move the mic closer.

Are base latency and output latency the measured result?

No. They are separate estimates reported by the browser. The main result comes from detecting the played chirp in microphone samples across five accepted trials.

Is microphone audio uploaded or saved?

No. Sample analysis, saved baselines, and evidence export are handled locally in your browser. Microphone tracks are stopped after the run or when you leave the page.

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