Key takeaways
- A 64 GB card at 50 Mbps holds 3h 3m 15s, 21.0 GB per hour.
- Recording bitrate decides everything: halving it doubles the time.
Planning a card or drive
Recording time is capacity divided by bitrate. Choose the bitrate your camera records at, not the one you export, and leave some space free: a card that is nearly full can stop a recording early.
Card sizes are sold in decimal gigabytes while this calculator counts binary gigabytes, so the real time is a few percent shorter.
Scenarios
| Scenario | Recording time | Per hour | Clips of 60s |
|---|---|---|---|
| 64 GB at 50 Mbps | 3h 3m 15s | 21.0 GB | 183 |
| 128 GB at 100 Mbps | 3h 3m 15s | 41.9 GB | 183 |
| 256 GB at 100 Mbps | 6h 6m 30s | 41.9 GB | 366 |
| 1 TB at 200 Mbps | 12h 13m 0s | 83.8 GB | 733 |
| 32 GB at 20 Mbps | 3h 49m 4s | 8.4 GB | 229 |
Recording time for common cards and bitrates
| Capacity | 20 Mbps | 50 Mbps | 100 Mbps | 200 Mbps |
|---|---|---|---|---|
| 32 GB | 3h 49m 4s | 1h 31m 38s | 45m 49s | 22m 54s |
| 64 GB | 7h 38m 8s | 3h 3m 15s | 1h 31m 38s | 45m 49s |
| 128 GB | 15h 16m 16s | 6h 6m 30s | 3h 3m 15s | 1h 31m 38s |
| 256 GB | 30h 32m 31s | 12h 13m 0s | 6h 6m 30s | 3h 3m 15s |
| 512 GB | 61h 5m 2s | 24h 26m 1s | 12h 13m 0s | 6h 6m 30s |