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Audio Buffer Latency Calculator: Buffer Contribution

Estimate input and output buffer duration from frames and sample rate. Understand what this excludes before comparing real audio latency.

Use this result well

Inputs that matter
Input buffer frames, Output buffer frames, Shared sample rate
Output to expect
Audio Buffer Duration: Input and Output
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Frames to milliseconds

A buffer holding N frames at sample rate R Hz spans 1000 × N / R milliseconds. One frame contains one sample per channel; do not multiply by channel count. Input and output durations are added without rounding intermediate values.

Worked example and assumptions

128 input frames and 256 output frames at 48,000 Hz contribute 2.666… ms and 5.333… ms, totaling 8 ms. Equal 512-frame buffers at 48,000 Hz total 21.333… ms. These are buffer sums, not observed system measurements. Inputs must be positive whole numbers within JavaScript’s safe integer range; the combined frame count must also fit that range.

Compare with the real signal path

Converter, driver, safety-buffer and processing delays are excluded. Check the DAW’s reported input/output latency and its documented measurement procedure. A recording-alignment offset does not remove the delay heard during live monitoring.

Source: Ableton: How Latency Works

Recording alignment differs from monitoring delay

Follow the application’s documented loopback procedure if recorded audio is misplaced. Driver error compensation corrects recording placement; it does not make live monitoring instantaneous.

Source: Ableton: Driver Error Compensation FAQ

Test stability in the actual session

Compare supported settings while playing or recording the real project. If audio crackles or drops out, follow the application’s troubleshooting steps and re-test. There is no universally best buffer size.

Source: Ableton: Avoid crackles and dropouts

Updated: September 2026

Example Scenarios

Keep the sample rate fixed and compare supported buffer settings. Re-test the actual project for clicks, dropouts and comfortable monitoring before adopting a change.

If your software documents different input and output buffer sizes at one rate, enter them separately. A single advertised buffer size does not prove that every stage has that size.

If the DAW reports more latency than this buffer sum, review its driver, converter and plug-in path. Do not subtract this result from a measured total and call the remainder CPU time.

Common Mistakes to Avoid

Calling the sum actual round-trip latency

This is only one input buffer plus one output buffer. Use the DAW’s report or documented loopback measurement for the actual configuration.

Entering kHz, bytes or channel totals

Enter 48000 for 48 kHz. Buffer size is frames per channel; stereo does not double the time represented by 256 frames.

Always choosing the smallest buffer or highest rate

Use settings supported by the device and session. Smaller buffers can produce crackles or dropouts; test the actual project and consult the stability reference in the methodology.

FAQ

No. It calculates durations from numbers you enter, without accessing an audio device or sending a test signal. Full system latency requires configuration-specific reporting or measurement.

The sum assumes one buffer in each direction. They may differ. If your software exposes a single setting, entering it twice is an equal-buffer assumption, not confirmation of the entire signal path.

No. Each frame includes the samples for all channels at one instant. Channel count changes data volume, not the duration represented by a fixed frame count and rate.

No. Recording placement and alignment are different from the delay a performer hears. Follow the DAW documentation for your monitoring and compensation options.

Yes, by changing the shared rate and comparing results. Both buffers must use that same rate in this model. A rate change can affect the session and system load; it is not automatically a better recording choice.

About Audio Buffer Latency Calculator: Buffer Contribution

Compare the buffering portion of a software-monitored audio path. Enter one input buffer and one output buffer at a shared sample rate; the result does not measure your interface or predict the full delay you hear.