Video bitrate and file size calculator

File size is bitrate times duration: 10 Mbps for one minute is 75 MB, because one megabit per second is 0.125 megabytes per second. Enter a bitrate to get the file size and storage per hour, or a target size to get the bitrate that fits it.

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ProRes and YouTube presets

Duration

Hours:minutes:seconds, minutes:seconds or seconds, e.g. 1:30:00

Video bitrate

Audio bitrate (kbps)

0 if the audio is counted in the bitrate or there is none. Stereo AAC is often 192–320 kbps; 48 kHz 24-bit PCM is 2,304 kbps.

Preset

Apple ProRes target rates and YouTube’s recommended upload rates.

Reference

Sizes and rates at a glance

Storage per bitrate
Bitrate	Per second	Per minute	Per hour
5 Mbps	625 KB	37.5 MB	2.25 GB
8 Mbps	1 MB	60 MB	3.6 GB
12 Mbps	1.5 MB	90 MB	5.4 GB
20 Mbps	2.5 MB	150 MB	9 GB
50 Mbps	6.25 MB	375 MB	22.5 GB
100 Mbps	12.5 MB	750 MB	45 GB
220 Mbps	27.5 MB	1.65 GB	99 GB
400 Mbps	50 MB	3 GB	180 GB
884 Mbps	111 MB	6.63 GB	398 GB

Apple ProRes data rates (Mbps)
Frame size	Frame rate	ProRes 422 Proxy	ProRes 422 LT	ProRes 422	ProRes 422 HQ	ProRes 4444
1920 × 1080	24p	36	82	117	176	264
1920 × 1080	25p	38	85	122	184	275
1920 × 1080	30p	45	102	147	220	330
1920 × 1080	50p	76	170	245	367	551
1920 × 1080	60p	91	204	293	440	660
3840 × 2160	24p	145	328	471	707	1,061
3840 × 2160	25p	151	342	492	737	1,106
3840 × 2160	30p	182	410	589	884	1,326
3840 × 2160	50p	303	684	983	1,475	2,212
3840 × 2160	60p	363	821	1,178	1,768	2,652

Target data rates from Apple’s ProRes white paper (April 2022). The 30p and 60p rows also cover 29.97 and 59.94 fps; ProRes 4444 is without alpha. Real files vary a little with image detail.

YouTube recommended upload bitrates, SDR (Mbps)
Resolution	24, 25, 30 fps	48, 50, 60 fps
4320p (8K)	80–160	120–240
2160p (4K)	35–45	53–68
1440p	16	24
1080p	8	12
720p	5	7.5
480p	2.5	4
360p	1	1.5

From YouTube Help, “Recommended upload encoding settings”. Stereo audio: 384 kbps.

FAQ

Frequently asked questions

Something else, or a file that will not convert? Write to conform@niamori.ai.

How do I convert Mbps to MB?

Divide by 8. One Mbps (megabit per second) is 0.125 MB (megabytes) per second, 7.5 MB per minute and 450 MB per hour. Bitrates are written in bits, file sizes in bytes, and a byte is 8 bits.

How do I calculate a video’s file size?

Add the video and audio bitrates, multiply by the duration in seconds and divide by 8. For example, (8 Mbps video + 0.32 Mbps audio) × 600 seconds ÷ 8 = 624 MB.

Why is my export bigger or smaller than calculated?

Most H.264 and HEVC exports use a variable bitrate, which spends fewer bits on simple shots, so the bitrate you set is an average or a target. ProRes data rates also vary a little with image detail, and the container adds a small overhead.

How much storage do I need for a 4K shoot?

Multiply the per-hour figure by the hours you expect to record, then double it for a backup. UHD ProRes 422 HQ at 25p is 737 Mbps, about 332 GB an hour, so four hours of footage needs about 1.3 TB, or 2.7 TB with a backup copy.

Why does Windows show a smaller size?

Windows divides by 1,024 instead of 1,000 but still writes KB, MB and GB, so a 1 GB file shows as about 0.93 GB there. Drive makers and macOS count in thousands, the same as this calculator.