Video
Video File Size Calculator
File size of a video from its bitrate and duration, including the audio track.
bytes = (video bitrate + audio bitrate) ×…
Also called video size calculator · mp4 file size
Tech & Media · 8 calculators
Video Calculators
Video file size and bitrate, duration, frame counts and timecodes, recording time on a drive and resolutions.
Video
Video Bitrate Calculator
Bitrate needed for a target file size, or recommended bitrate for a resolution and frame rate.
bitrate ≈ width × height × fps × motion f…
Also called bitrate calculator · target file size bitrate
Video
Video Duration Calculator
How long a video runs from its file size and bitrate, or how much fits in a space.
seconds = file size in bits ÷ bitrate in …
Also called video length from size · how long is my footage
Video
Frames to Time Calculator
Convert a frame count to a duration and timecode at any frame rate.
seconds = frames ÷ frame rate
Also called frame count to duration · frames to seconds
Video
Time to Frames Calculator
Convert a duration to a frame count at any frame rate, with the timecode.
frames = seconds × frame rate
Also called duration to frames · seconds to frames
Video
Recording Time Calculator
How much video or audio fits on a card or drive at a given bitrate.
seconds = usable bytes × 8 ÷ bitrate in b…
Also called how long can i record · card recording time
Video
Video Resolution Calculator
Compare video resolutions by pixel count, aspect ratio and the bitrate each needs.
pixels per frame = width × height
Also called resolution comparison · 4k vs 1080p
Video
Aspect Ratio Calculator
Find the aspect ratio of any width × height, or calculate a missing dimension for 16:9, 4:3, 21:9 and custom ratios.
W : H = (W ÷ GCD) : (H ÷ GCD)
Also called aspect ratio · 16:9 calculator
Key video formulas
| Video File Size | bytes = (video bitrate + audio bitrate) × seconds ÷ 8 |
|---|---|
| Video Bitrate | bitrate ≈ width × height × fps × motion factor ÷ 1,000,000 |
| Video Duration | seconds = file size in bits ÷ bitrate in bits per second |
| Frames to Time | seconds = frames ÷ frame rate |
| Time to Frames | frames = seconds × frame rate |
| Recording Time | seconds = usable bytes × 8 ÷ bitrate in bits per second |
| Video Resolution | pixels per frame = width × height |
| Aspect Ratio | W : H = (W ÷ GCD) : (H ÷ GCD) · H = W × b ÷ a |
Video questions
What bitrate should I use for 1080p?
About 8 Mbps for good quality streaming, 12–20 Mbps for high-motion content, and 50 Mbps or more for editing masters.
What are the common aspect ratios?
16:9 for HD video and most monitors, 4:3 for older TVs and iPads, 21:9 for ultrawide displays, 1:1 for square social posts, 9:16 for vertical video and 3:2 for many camera sensors.