Audio file size

Estimate audio size from duration in minutes and total encoded bitrate in kbit/s: bytes = minutes × 60 × bitrate × 1000 ÷ 8 × (1 + reserve/100). Zero duration yields zero bytes. A blank reserve means zero. Use the total bitrate of all encoded channels; do not double an already combined stereo bitrate.

Constant bitrate estimates the encoded payload. Variable bitrate requires a representative average bitrate. Reserve is a percentage allowance, not measured container overhead. Headers, metadata and padding are not inspected. Uncompressed PCM requires its total data rate; this tool does not read or encode files.

MB uses 1,000,000 bytes; MiB uses 1,048,576. Other units expand to bytes, kB (1000 bytes) and KiB (1024 bytes). Eight bits make one byte. Displays use up to eight significant digits and scientific notation for small or large values. All units come from the unrounded estimate; fractional byte estimates do not represent a physical file length. NIST binary prefixes.

Browser floating-point calculation is limited to 9,007,199,254,740,991 bytes. Non-finite, larger or too-small-to-represent positive payloads are rejected. Binary exponent scaling avoids premature underflow of factors that later cancel. These are computational limits, not file format limits. Inputs update the estimate directly; Enter updates immediately. Only raw inputs are kept locally, including invalid drafts. Results are recalculated.