Video File Size Calculator
Storage needed for any bitrate and duration.
Enter your values
Enter the video bitrate in Mbps.
Enter the duration in minutes.
Enter the audio bitrate in kbps.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- File size
- 11.06 GB
- Per minute
- 377.4 MB
- Hours on a 1 TB drive
- 46.3
- Upload time at 20 Mbps
- 75.5 minutes
Quick answer
Video file size is bitrate × duration; at 4K 100 Mbps, one minute consumes about 750 MB.
Size (MB) = bitrate (Mbps) × seconds ÷ 8
At a glance
| What it does | Storage needed for any bitrate and duration. |
|---|---|
| Category | Conversions |
| Inputs needed | Video bitrate, Duration, Audio bitrate |
| Main output | File size |
| Formula | Size (MB) = bitrate (Mbps) × seconds ÷ 8 |
| Cost | Free — no sign-up, no download |
How to use the Video File Size Calculator
- 1Enter your recording bitrate.
- 2Enter the duration in minutes.
- 3Add the audio bitrate for an accurate total.
Inputs explained
- Video bitrate(Mbps)
- Enter the video bitrate in Mbps.
- Duration(minutes)
- Enter the duration in minutes.
- Audio bitrate(kbps)
- Enter the audio bitrate in kbps.
Worked example
Using the values the calculator loads with:
Inputs
- Video bitrate50 Mbps
- Duration30 minutes
- Audio bitrate320 kbps
Results
- File size11.06 GB
- Per minute377.4 MB
- Hours on a 1 TB drive46.3
- Upload time at 20 Mbps75.5 minutes
Frequently asked questions
What bitrate should I record at?
1080p30 looks good at 8–12 Mbps for delivery; 4K editing masters usually run 50–100 Mbps or higher.
Does resolution alone determine size?
No — bitrate does. A low-bitrate 4K file can be smaller than a high-bitrate 1080p file, but it will look worse.
What do I need to enter into the Video File Size Calculator?
Just 3 values: video bitrate, duration, audio bitrate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Video File Size Calculator work out the answer?
Video file size is bitrate × duration; at 4K 100 Mbps, one minute consumes about 750 MB. It applies the formula Size (MB) = bitrate (Mbps) × seconds ÷ 8 and shows the working so you can check each step by hand.
Is the Video File Size Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.