Video Bitrate Calculator. Reproduce decimal video-file size from documented video/audio bitrates, duration and explicit container overhead, then compare an independent file-size record.
A quick decision brief for this specific tool
One de-identified encode record; named reviewed encode specification, video-bitrate, audio-bitrate, container-overhead and independent-file-size records; seconds or minutes; positive duration and video Mbps; nonnegative audio kbps and independent decimal MB; and an explicit overhead from zero through 100%
Source-preserving record basis, normalized duration, combined payload bitrate, payload and overhead sizes, reproduced decimal MB/GB, independent decimal MB and signed reproduced-minus-independent file-size difference
Convert documented audio kbps to decimal Mbps, add it to the documented video Mbps, multiply by duration seconds and divide by eight for decimal payload MB, then apply only the documented overhead percentage and compare the independent size; do not recommend codec, bitrate, encoder, quality, rate control, platform preset, upload bandwidth or storage capacity
Choose your path
Reproduce decimal video-file size from one reviewed duration and bitrate record, then compare an independent size without recommending an encode or delivery setting.
Explain why an encoder estimate and a measured output differ without receiving a generic codec preset.
Name the exact encode/export record, copy duration and stream bitrates, document overhead and compare the measured decimal-MB file.
Can isolate duration, stream-scope, unit or overhead mismatch while quality and encoder decisions stay with the reviewed specification and test encode.
Keep a current destination specification distinct from actual encoder settings and media results.
Use reviewed-delivery-specification basis, preserve codec/profile/color/rate-control context in the named record and compare a separate expected size.
Gets traceable decimal arithmetic without a platform acceptance, upload-bandwidth or storage-capacity promise.
Understand kbps/Mbps, bits/bytes, seconds/minutes and container overhead without assuming resolution determines bitrate.
Run seconds and minutes exercises, zero-audio/zero-overhead boundaries and positive or negative independent-size differences.
Can reproduce size arithmetic and name the codec, content, encoder and delivery variables that remain outside the calculation.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Inputs = exact duration + documented video Mbps + documented audio kbpsMbps, kbps, MB and GB use decimal SI prefixes. Convert minutes to seconds and bits to bytes explicitly. Include all intended audio streams in the reviewed audio-bitrate record; no generic audio default is added.
Payload MB = (video Mbps + audio kbps ÷ 1,000) × duration seconds ÷ 8Container/index/metadata overhead varies with implementation and stream structure. Enter a reviewed or measured percentage, then treat the signed difference as an audit prompt—not proof of quality, platform acceptance or exact multiplex size.
Reproduced MB = payload MB × (1 + overhead % ÷ 100); difference = reproduced MB − independent MBUpdated: August 2026
A 600-second exercise copies 8 Mbps video, 128 kbps audio and 2% overhead. The payload is 609.6 MB, reproduced file is 621.792 MB and comparison with 622 MB preserves a signed −0.208 MB difference.
A producer enters the exact current platform/export record, selects minutes, and compares its documented target size. The tool normalizes time but does not claim the destination will accept or reproduce the encode.
An editor can enter a measured average video bitrate, all included audio streams and a measured overhead basis, then use a positive or negative signed difference to investigate duration, stream-scope, units or mux overhead.
Create a source-labelled arithmetic record from an already reviewed encoder/export record or current delivery specification. Convert documented video and audio bitrates over an exact duration, apply only an explicit overhead percentage and compare one independent decimal-megabyte file-size record. The calculator does not recommend a bitrate, codec, encoder, quality target, rate-control mode, platform preset, upload bandwidth or storage capacity.