Video Recording Size Calculator – Calculate Video File Size by Bitrate
Calculate exactly how large your video files will be based on recording duration and bitrate with our free video recording size calculator. Works for 1080p, 4K, and 8K video at any frame rate. This video file size calculator helps videographers, content creators, and smartphone users plan storage requirements before recording long sessions, ensuring you never run out of space mid-recording.
Video Recording Size Calculator
Calculate video file size before you shoot
Common bitrates: 1080p≈16Mbps, 4K30≈45Mbps, 4K60≈80Mbps
Video Recording Size Calculator Features
- Calculates video file size from recording duration and video bitrate
- Provides common bitrate reference values for 1080p, 4K30, and 4K60 recording
- Displays file size in both megabytes and gigabytes for convenience
- Works for any combination of duration and bitrate values
- Useful for estimating storage requirements before a recording session
- Helps plan memory card capacity for events, travel, or filmmaking
How to Use Video Recording Size Calculator
- Enter the recording duration in minutes (e.g., 10) in the “Duration” field
- Enter the video bitrate in Mbps (e.g., 25 for 1080p) in the “Bitrate” field
- Refer to the hint text for common bitrate values: 1080p ≈ 16Mbps, 4K30 ≈ 45Mbps
- Click the Calculate button
- View the estimated file size in MB and GB in the results section
- Click Reset to calculate for a different recording scenario
Frequently Asked Questions
Video File Size (GB) = (Bitrate Mbps × Duration in seconds) ÷ 8 ÷ 1024. For example, a 30-minute 4K video at 60Mbps = approximately 13.5GB. Our video size calculator handles this automatically.
At typical 4K smartphone bitrates (35–100 Mbps), a 1-hour recording ranges from 15GB to 43GB. Higher bitrate settings produce better quality but larger files.
Most flagship smartphones record 4K at 35–100 Mbps. Cinematic modes or ProRes formats (iPhone Pro models) can reach 700–1800 Mbps, producing enormous files of 5–10GB per minute.
At 20 Mbps (typical 1080p 30fps), 1 hour = approximately 9GB. At 1080p 60fps (30–40 Mbps), 1 hour = approximately 13–18GB. Use our calculator for your specific bitrate.
Bitrate is the primary determinant of file size for a given duration. Resolution affects what bitrate is necessary to maintain quality, but a high-resolution video at low bitrate can actually be smaller than low-resolution high-bitrate footage.
Bitrate is the rate at which data is recorded per second (Mbps). File size is the total data accumulated over the entire recording duration. Higher bitrate = larger file size over the same duration.
Modern codecs like H.265 (HEVC) and AV1 achieve similar quality to H.264 at roughly half the bitrate, significantly reducing file size. Re-encoding with efficient codecs can dramatically reduce storage requirements.
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