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About this tool
Calculate optimal video bitrate requirements for different formats and quality levels.
The Video Bitrate Calculator works out the raw and compressed bitrate of a clip from width x height x bit depth x frame rate, then divides by a codec compression ratio to estimate the delivered stream and the finished file size. Pick a resolution from 360p to 4K UHD, a frame rate from 23.976 to 60 fps, an 8-, 10- or 12-bit depth, a codec, and a duration, and you get raw Mbps, compressed Mbps, raw MB and compressed MB side by side. It is built for editors, streamers and anyone sizing storage or an upload before committing to an export.
Open Video Bitrate Calculator on AltFTool — it loads instantly in your browser.
Pick a Resolution tile from 360p up to 4K UHD, a Frame Rate (FPS) between 23.976 and 60, and an 8-, 10- or 12-bit Bit Depth.
Enter Duration (seconds), then choose a Compression / Codec tile — Uncompressed, ProRes 4444, ProRes 422, DNxHR HQ, H.264, HEVC/H.265, VP9 or AV1.
Calculation Results shows Raw Bitrate and Compressed Bitrate in Mbps beside Raw Size and Compressed Size in MB, with a Copy button for the figures.
You see the uncompressed pixel throughput and the codec-reduced figure together, so the compression ratio you chose is visible rather than assumed.
ProRes 4444, ProRes 422, DNxHR HQ, H.264, HEVC/H.265, VP9 and AV1 each carry their own ratio, so intermediates and delivery codecs are not lumped together.
Duration is part of the calculation, so the same screen answers both what your link must sustain and how many megabytes land on disk.
Multiply the pixel count by the bit depth to get bits per frame, then multiply by the frame rate to get bits per second. At 1080p (1920x1080), 8-bit, 30 fps that is 2,073,600 x 8 x 30 = about 497.66 Mbps raw, which is then divided by the codec's compression ratio.
This calculator returns roughly 14.2 Mbps, using its H.264 compression ratio of 35 against the 497.66 Mbps raw figure. Real encoders vary widely with motion and grain, so treat it as a starting target and check the encoder's own output.
File size in megabytes is bitrate in bits per second multiplied by duration in seconds, divided by 8, then divided by 1024 twice. A 60-second clip at 14.2 Mbps works out to roughly 101 MB, which the calculator reports for you.
Because it applies a fixed ratio per codec rather than encoding your footage. A static talking head compresses far harder than fast-moving, grainy or high-detail footage at the same settings, so the real bitrate a variable-rate encoder produces will move around this number.
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