Audio Delay Test: Measure Your Audio Latency Online

You press play. The sound arrives a fraction of a second late. That tiny gap is audio latency, and it matters more than most people realise. Whether you are gaming, recording music, streaming live, or jumping on a video call, audio delay affects every experience where sound and timing interact.

This free audio delay test measures exactly how much latency your setup introduces — in milliseconds, right in your browser. No downloads. No microphone required. Just a tone, a button, and your ears.

Table of Contents

• How to Use the Audio Delay Test
• What Is Audio Latency?
• Reading Your Results: What the Numbers Mean
• What Causes Audio Delay?
• Audio Latency by Use Case
• How to Reduce Audio Latency
• Bluetooth Audio Delay: What to Expect
• Frequently Asked Questions

How to Use the Audio Delay Test

The test runs six rounds by default. Here is exactly what happens in each one:

1. Put on your headphones or make sure your speakers are on at a comfortable volume.
2. Click Start Test. A countdown begins.
3. After a randomized delay, a short 880Hz tone plays through your audio output.
4. Press I Heard It the instant you hear the tone.
5. The tool records the time between when the tone played and when you pressed the button.
6. After all rounds, you see your average audio latency score and a grade.

The randomized delay — between 600ms and 2,500ms — prevents you from anticipating the tone. Your reaction time is what you hear, not what you predict.

Tip: Run the test two to three times and compare your averages. Your first run often scores higher as you get familiar with the rhythm of the tool. Later runs tend to be more accurate.

What Is Audio Latency?

Audio latency is the total delay between when a sound is triggered and when you actually hear it through your speakers or headphones. Every device in your signal path adds a small delay. The sum of all those delays is your system’s audio latency.

It is measured in milliseconds (ms). One millisecond is one thousandth of a second. That sounds negligibly small, but at 100ms, the delay becomes perceptible to most people. At 300ms, it is obvious and disruptive.

Your signal travels through several layers before you hear it:

• OS audio buffer — the operating system queues audio samples before sending them to the driver.
• Audio driver — translates software instructions into hardware commands. Outdated drivers add unnecessary overhead here.
• DAC (digital-to-analogue converter) — converts the digital signal to an analogue waveform your speakers can produce.
• Connection type — wired connections add virtually zero delay; Bluetooth introduces encoding, transmission, and decoding delays that stack up.
• Application buffering — some software adds its own audio buffer on top of the OS buffer.

Each layer is small. Together, they add up fast.

Reading Your Results: What the Numbers Mean

The tool grades your result across five bands. Here is how to interpret your score:

Result	Grade	What it means
Under 100ms	Exceptional	Studio-grade performance. You are using wired audio or a premium low-latency setup. Suitable for live music monitoring.
100–160ms	Excellent	Fast and clean. Most professional setups with quality drivers land here. Ideal for gaming, streaming, and calls.
160–250ms	Good	Solid for everyday listening, media playback, and casual gaming. Most users will not notice anything at this range.
250–400ms	Average	Noticeable to attentive listeners. Often caused by Bluetooth headphones on SBC or AAC codecs. Consider switching to wired.
Over 400ms	High Latency	Significant delay. Bluetooth, an outdated driver, or a large audio buffer is likely the cause. See the section below on fixes.

Keep in mind that this test measures the full chain from your audio hardware to your ears. If your result scores well but you still notice delay in a specific app — a video call, a DAW, a game — that application may be adding its own buffering on top. Test within that app’s own settings for a more targeted diagnosis.

What Causes Audio Delay?

Most latency problems come from one of five sources.

Bluetooth Encoding and Transmission

Bluetooth is the most common cause of high audio latency for everyday users. The audio signal is compressed using a codec, transmitted wirelessly, received, and decoded at the other end. Standard codecs like SBC and AAC typically add 100–300ms of delay. Even with modern low-latency codecs like aptX Low Latency or Bluetooth LE Audio, you will still see 20–80ms on top of your base hardware latency.

Large Audio Buffer Size

Your OS and audio driver process sound in chunks called buffers. A larger buffer gives the hardware more time to process the audio without gaps or crackling, but it also means the sound sits in the queue longer before you hear it. On Windows, the default buffer size is often set conservatively large. Reducing it drops latency but increases the risk of audio glitches if your CPU cannot keep up.

Outdated or Generic Audio Drivers

Generic drivers installed by Windows Update are not optimised for low latency. Manufacturer-specific drivers, and especially ASIO drivers for audio interfaces, bypass the Windows Kernel Mixer and can reduce latency by up to 30ms on their own.

Audio Enhancement Features

Windows includes built-in audio enhancements — equalisation, bass boost, virtual surround — that add processing time to every audio signal. These run in software and each one introduces additional delay before the sound reaches your ears.

Background Applications

Apps that claim the audio device — Zoom, Discord, Spotify, browser tabs playing video — compete for the audio pipeline. When multiple apps fight for the same resource, buffering increases and latency spikes.

Audio Latency by Use Case

The acceptable range of audio latency depends entirely on what you are doing. The same 150ms result that is perfectly fine for watching Netflix becomes a real problem in a competitive game or a recording session.

Music Production and Recording

This is where latency requirements are strictest. Professional recordings target under 5ms total round-trip latency. The threshold where musicians begin to feel timing discrepancies is around 10–12ms — above that, a vocalist hears a slight doubling effect between their direct voice and the monitored signal in their headphones. Drummers and percussionists are the most sensitive; vocalists, slightly more tolerant but still constrained.

For home recording, under 20ms is workable for most instruments. Above 30ms, you will notice the delay while singing or playing in real time.

Gaming

Competitive gaming requires audio cues — footsteps, gunshots, ability sounds — to arrive in sync with visual events. At 100ms or above, the audio feedback starts to feel detached from the action on screen. Professional gamers target under 40ms. For casual play, under 100ms is acceptable. Rhythm games like Beat Saber are among the strictest use cases: even 50ms of delay makes precise timing unreliable.

Live Streaming

For streamers, audio and video must stay in sync within about 40ms before viewers notice lip-sync drift. Most streaming software lets you add a manual video delay offset to compensate for audio latency, but fixing the source of the delay is always preferable to patching it downstream.

Video Calls and Meetings

Calls tolerate higher latency than any other use case because the delay affects both sides equally and humans naturally adjust. Under 200ms is comfortable for conversation. Above 250ms, talk-overs and conversational gaps start to frustrate participants. Above 400ms, calls feel genuinely broken.

Casual Listening and Media Playback

For music playback where you are not monitoring your own performance, the threshold where most people notice a delay is around 40–60ms. Below that, the experience feels seamless. For movies and video content on the same device playing audio and video, sync is handled at the OS level and latency rarely becomes noticeable unless your audio setup is routed through an external device with a long signal chain.

How to Reduce Audio Latency

Most high-latency results can be improved without buying new hardware. Start with the lowest-effort fixes and work down the list.

Switch to a Wired Connection

This is the single largest latency reduction most users can make. A wired 3.5mm connection adds effectively zero delay. A USB audio interface adds 3–10ms. Both are far below the 100–300ms of a typical Bluetooth connection.

Update Your Audio Driver

Go to your sound card or motherboard manufacturer’s website and download the latest driver directly. Do not rely on Windows Update for this. On Windows, installing an ASIO driver (if one is available for your hardware) bypasses the Kernel Mixer and can reduce latency by 20–30ms in a single step.

Disable Audio Enhancements on Windows

1. Right-click the speaker icon in the taskbar and select Playback devices.
2. Select your default playback device and click Properties.
3. Go to the Enhancements tab and check Disable all enhancements.
4. Click OK and re-run the test.

Reduce Your Audio Buffer Size

Open your audio driver’s control panel (or your DAW’s audio settings) and reduce the buffer size incrementally. Start at 256 samples, test for audio glitches, then try 128. Lower buffer sizes improve latency but increase CPU load. Find the lowest setting where your audio plays cleanly.

Close Background Audio Applications

Close any apps that access your audio device — Zoom, Teams, Discord, Spotify, browser tabs with video. Re-run the test with only the essentials open. You may find the improvement substantial if your device was being shared across several apps.

Keep Your Device Plugged In

Laptops in battery-saving mode throttle the CPU and audio pipeline. Power-saving modes have been observed to push latency from under 50ms to over 150ms on the same device. Run your latency test while plugged in to get a true baseline reading.

Bluetooth Audio Delay: What to Expect

Bluetooth remains the most common source of high audio latency for everyday users. Understanding which codec your headphones use helps you set realistic expectations — and make better purchasing decisions.

Codec	Typical Latency	Notes
SBC	150–300ms	Universal compatibility codec. The default fallback on almost all Bluetooth devices. Prioritises compatibility over speed.
AAC	100–200ms	Default on Apple devices. Lower than SBC on Apple hardware but performs inconsistently on Android.
aptX	70–150ms	Qualcomm standard. Better than SBC and AAC for latency on compatible devices.
aptX Low Latency	40ms	Designed specifically to reduce delay. Requires both headphones and source device to support it.
Bluetooth LE Audio (LC3)	20–50ms	The newest standard. Adoption is still limited as of 2025 but is expanding in newer devices.
2.4GHz wireless (dongle)	1–5ms	Not Bluetooth. Proprietary wireless standard used by gaming headsets. Much lower latency than any Bluetooth codec.
Wired (3.5mm or USB)	0–5ms	No encoding or wireless transmission. The baseline all other connection types are measured against.

One important note: both your headphones and your source device must support the same codec for it to activate. If your headphones support aptX Low Latency but your phone only outputs SBC, you will connect at SBC speeds. Check both ends of the connection before assuming a low-latency codec is active.

Frequently Asked Questions

What is a good audio latency score?

Under 100ms is good for most everyday listening contexts. Under 40ms is excellent for gaming and streaming. For professional music recording and live performance monitoring, the target is under 10ms — at or above that threshold, musicians begin to feel the delay as a physical disruption to their timing.

Why is my audio delay so high?

The most common causes are Bluetooth headphones (which add 100–300ms depending on the codec), a large audio buffer set in your OS driver, outdated audio drivers, or background applications competing for the audio device. Start by switching to a wired connection and disabling audio enhancements to see the largest immediate improvements.

Does Bluetooth cause audio delay?

Yes, consistently. Bluetooth audio requires encoding the signal, transmitting it wirelessly, receiving it, and decoding it. Even the fastest current Bluetooth codecs add around 20–40ms. Standard SBC or AAC codecs, which most devices default to, add 100–300ms. If your test returns a high result and you are using wireless headphones, switching to wired is the fastest fix.

What is audio latency measured in?

Audio latency is measured in milliseconds (ms). A millisecond is one thousandth of a second. Human perception of audio delay starts around 20ms for trained musicians and around 40–60ms for most listeners in casual contexts.

How does the audio delay test work?

The tool uses the Web Audio API to play a tone through your audio output after a randomized delay. You press a button the moment you hear it. The gap between when the tone was scheduled and when you reacted is your measured audio output latency. The randomized delay prevents you from anticipating the tone and skewing your result.

Can I reduce audio latency without buying new hardware?

Often yes. Updating your audio driver, disabling Windows audio enhancements, reducing your buffer size, closing background audio apps, and keeping your device plugged into power can all reduce latency without any hardware changes. Switching from Bluetooth to wired remains the single most impactful change for most users, and the cable itself costs nothing if you already own one.