Recording Time Calculator – Hours per GB
Calculate how many hours of video or audio you can record per GB or TB of storage.
About This Calculator
Calculate how many hours of video or audio you can record per GB or TB of storage. Use the calculator above for instant results.
Worked Examples
- 256 × 1024 × 8 / 100 / 3600 = 5.8 hours
Answer: 5.8 hours
- 1024 × 1024 × 8 / 20 / 3600 = 116 hours
Answer: ~116 hours
- 64 × 1024 × 8 / 50 / 3600 = 2.9 hours
Answer: ~2.9 hours
Who Uses This Calculator?
Know how long your card will record.
Plan shoot storage needs.
Check phone storage before filming.
Plan recording storage for cameras.
Common Mistakes to Avoid
❌ Dual codec recording
Many cameras record both a proxy (small) and original (large) file simultaneously. Only count the larger bitrate.
❌ Buffer vs card speed
High-speed recording (4K 120fps) requires fast UHS-II or CFexpress cards. Slow cards cause recording to stop mid-shoot.
Frequently Asked Questions
How much storage for a wedding?
4K at 100 Mbps for 8 hours = ~360 GB. Always bring 50% more than calculated.
SD card speeds?
V60 = 60 MB/s minimum write (4K up to 200 Mbps). V90 = 90 MB/s (4K+ up to 400 Mbps). Check your camera's required spec.
Hours per GB by quality?
4K 100 Mbps: 0.02 hrs/GB. 1080p 20 Mbps: 0.11 hrs/GB. 1080p 8 Mbps: 0.28 hrs/GB. 720p 4 Mbps: 0.57 hrs/GB.