Bluetooth Audio Latency Test
Measure estimated latency of your Bluetooth audio device by timing audio round-trip delay. Compare results with wired connections.
This test plays short tones through your Bluetooth audio device and measures the round-trip delay using the Web AudioContext API across 5 samples, reporting the median latency.
Standard SBC Bluetooth codec adds 150-250 ms latency, while aptX Low Latency achieves under 40 ms — a 4-6x improvement critical for gaming and video sync.
What Do Your Results Mean?
| Result | Range | Meaning |
|---|---|---|
| Good | Below 80 ms | Your Bluetooth audio has low latency suitable for video playback, casual gaming, and real-time communication without noticeable lip-sync issues. |
| Warning | 80 – 150 ms | Noticeable delay for gaming and video editing. Audio may feel slightly out of sync with visuals. Consider aptX or AAC codec if available. |
| Bad | Above 150 ms | Significant audio delay that causes visible lip-sync mismatch. Likely using SBC codec. Switch to a wired connection for latency-sensitive tasks. |
Common Issues and How to Fix Them
Latency result shows 0 ms or unrealistically low values
The test may be detecting the local speaker instead of Bluetooth output. Verify your Bluetooth device is set as the default audio output in system sound settings before testing.
Results vary widely between test runs
Close other audio applications, ensure no background downloads are running, and keep the Bluetooth device within 2 meters. The test uses 5 samples and reports the median to reduce variance.
Test fails to produce any audio or measurement
Grant microphone permission when prompted, ensure your Bluetooth device supports audio output (not just calls), and try Chrome or Edge which have the best AudioContext support.