Does this include audio?

It includes whatever bitrate you enter. Add video and audio bitrates together if you only know them separately.

Why does my encoder show MiB instead of MB?

This tool uses decimal MB (1,000,000 bytes). Some apps use MiB (1,048,576 bytes), which will show a slightly smaller number.

How accurate is this for VBR?

VBR files fluctuate, but the average bitrate still gives a good estimate. Expect small differences due to overhead and bitrate swings.

Can I go from file size to bitrate?

Yes—divide file size bytes by duration seconds and multiply by 8 to get bits/sec, then convert to Kbps or Mbps.

What about overhead from codecs and containers?

Codec/container overhead is not included here. It’s usually minimal but can add a small amount to the final file size.

tech calculator

Bitrate to File Size Calculator

Convert a video/audio bitrate and duration into file size in MB and GB.

Results

File size (MB): 375.00
File size (GB): 0.38

How to use this calculator

Enter the bitrate and choose Mbps or Kbps.
Enter the duration in minutes.
See estimated file size in megabytes and gigabytes.

Inputs explained

Bitrate: Average data rate of your video/audio stream.
Bitrate unit: Choose Mbps for most video workflows or Kbps for audio/low-bitrate streams.
Duration: Length of the media in minutes.

How it works

Convert bitrate to bits/sec, multiply by duration, then to bytes, MB, and GB.

Supports Mbps or Kbps inputs for quick toggles.

Formula

Bits = bitrate × 1e6 (Mbps) × seconds
MB = Bits ÷ (8×1e6)
GB = MB ÷ 1000

When to use it

Planning upload sizes for YouTube, streaming platforms, or client deliveries.
Estimating storage needs before recording or exporting footage.
Checking if a planned encode will fit on a drive or meet attachment limits.

Tips & cautions

Bitrate should include all tracks you intend to ship (video + audio). If you only know video bitrate, add audio separately.
We use decimal megabytes (1 MB = 1,000,000 bytes); some tools show mebibytes (MiB) which are slightly smaller.
For long runtimes, small bitrate differences add up—round conservatively to avoid surprises.
Assumes constant average bitrate; variable bitrate (VBR) files may differ slightly.
Container overhead and metadata are not included but are usually small.
Does not convert target file size back to bitrate—do that manually by reversing the math.

Worked examples

5 Mbps for 10 minutes

Size ≈ 375 MB
≈ 0.38 GB

320 Kbps for 4 minutes

Size ≈ 9.6 MB

Deep dive

This bitrate to file size calculator multiplies your average bitrate by runtime to estimate total size in MB and GB. Enter Mbps or Kbps and the duration to see how big your encode will be.

Use it to plan uploads, portable drive space, or client deliveries. Include audio in the bitrate, and remember that VBR and container overhead can shift the final number slightly.

FAQs

Does this include audio?: It includes whatever bitrate you enter. Add video and audio bitrates together if you only know them separately.
Why does my encoder show MiB instead of MB?: This tool uses decimal MB (1,000,000 bytes). Some apps use MiB (1,048,576 bytes), which will show a slightly smaller number.
How accurate is this for VBR?: VBR files fluctuate, but the average bitrate still gives a good estimate. Expect small differences due to overhead and bitrate swings.
Can I go from file size to bitrate?: Yes—divide file size bytes by duration seconds and multiply by 8 to get bits/sec, then convert to Kbps or Mbps.
What about overhead from codecs and containers?: Codec/container overhead is not included here. It’s usually minimal but can add a small amount to the final file size.

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Estimates exclude codec/container overhead and assume average bitrate; verify against your encoder’s output.