Creative Tools
Video File Size to Bitrate Calculator
Enter duration and target size to see the average bitrate to aim for.
What bitrate fits my size limit?
Upload caps on email, LMS platforms and some social tools force a size budget before you export. Solving average bitrate from a target size uses bitrate (Mbps) ≈ size (MB) × 8 ÷ duration (seconds). Reserve a slice for audio (entered in kbps) so the video track does not eat the whole quota — the tool subtracts that audio rate from the total. Leave a little headroom for container overhead and variable bitrate (VBR) swings. Two-pass encoding helps hit size targets more reliably than a single rushed pass. For the forward estimate from a chosen bitrate, use the video bitrate calculator.
Worked example
A 500 MB cap on a 10-minute (600 s) video → total ≈ 6.67 Mbps. Reserving 128 kbps (0.128 Mbps) for audio leaves ≈ 6.54 Mbps for video.
Limits and assumptions
Average bitrate only. VBR encodes fluctuate; hard size caps may still need a safer lower target.
Frequently asked questions
How do I convert a GB limit to MB?
Use 1 GB ≈ 1,024 MB for disk-style quotas (some marketing pages treat 1 GB as 1,000 MB — match the host’s definition).
What does VBR mean?
Variable bitrate — the encoder spends more bits on complex scenes and fewer on simple ones, oscillating around your average.
Should podcasts raise the audio reserve?
Yes if the soundtrack is music-heavy or high-bitrate; simple voice under video can stay near 96–128 kbps.
Does HDR change the answer?
High dynamic range masters often need more bits for the same resolution — aim lower than the mathematical maximum if quality matters.