Audio File Size Calculator
Estimate audio file size from bitrate and duration.
How to use Audio File Size Calculator
1. Enter Audio Bitrate, Duration, Bitrate Unit. 2. Ideal constant payload bitrate; 8 bits = 1 byte. KB/MB/GB/TB use decimal powers of 1000; KiB/MiB/GiB/TiB use powers of 1024. Output byte units are decimal. Latency, protocol overhead, variable bitrate and device limits are excluded; this does not measure a connection or transfer a file. 3. Select Calculate or press Enter. 4. Select Copy result to copy the answer, or Reset to clear the form and result.
Why use this tool?
Ideal constant payload bitrate; 8 bits = 1 byte. KB/MB/GB/TB use decimal powers of 1000; KiB/MiB/GiB/TiB use powers of 1024. Output byte units are decimal. Latency, protocol overhead, variable bitrate and device limits are excluded; this does not measure a connection or transfer a file.
How the calculation works
Payload bytes = bitrate × duration seconds ÷ 8. Ideal constant payload bitrate; 8 bits = 1 byte. KB/MB/GB/TB use decimal powers of 1000; KiB/MiB/GiB/TiB use powers of 1024. Output byte units are decimal. Latency, protocol overhead, variable bitrate and device limits are excluded; this does not measure a connection or transfer a file. Counts and dimensions use the declared rounding convention; other numbers display up to three decimal places where applicable. Nonzero subsecond durations are labelled. Durations round to the nearest second; nonzero subsecond durations are labelled. File-size output units are decimal. Changing an input label does not convert filled values.
Example
Worked example: Audio Bitrate = 128; Duration = "1 min"; Bitrate Unit = "kbps". Result: 960 KB.
Practical tip
Check the input labels and assumptions against the audio file size task before reusing the number.
Frequently asked questions
What exactly does Audio File Size Calculator calculate?
Payload bytes = bitrate × duration seconds ÷ 8.
Which units or counting rules apply?
Ideal constant payload bitrate; 8 bits = 1 byte. KB/MB/GB/TB use decimal powers of 1000; KiB/MiB/GiB/TiB use powers of 1024. Output byte units are decimal. Latency, protocol overhead, variable bitrate and device limits are excluded; this does not measure a connection or transfer a file.
Does this inspect, change or upload my files?
This page calculates the entered values or text in the browser. Numeric image/media tools do not transform files. Check the worked example and stated counting basis; the result does not certify device, search-engine or accessibility outcomes.