Video File Size Estimator
Estimate how large a video file will be from its bitrate, resolution, and length — before you export. Handy for checking whether a delivery will fit an upload limit or a client's inbox.
Duration
minsec
Estimated file size
614 MB
8.2 Mbps total over 10m 0s
This is an estimate for constant-bitrate encoding. Variable-bitrate exports, newer codecs like H.265/AV1, and simpler footage can come out noticeably smaller.
Questions, answered.
- How is video file size calculated?
- File size is the total bitrate multiplied by the duration: (video bitrate + audio bitrate) × length in seconds ÷ 8 gives the size in bytes. A 10-minute 1080p clip at 8 Mbps video and 192 kbps audio works out to roughly 600 MB.
- What bitrate should I use for each resolution?
- As a rough H.264 guide: 480p ≈ 2.5 Mbps, 720p ≈ 5 Mbps, 1080p ≈ 8 Mbps, 1440p ≈ 16 Mbps, and 4K ≈ 35 Mbps. Fast motion and detailed footage need more; simple talking-head video needs less.
- Why is my actual export a different size?
- Most exports use variable bitrate, which adapts to the content, so quiet or static scenes use less data than the constant-bitrate estimate. Newer codecs like H.265 and AV1 also produce much smaller files at the same quality.
- Will this video fit in an email or upload limit?
- Compare the estimate against your destination's limit — most email caps at 20–25 MB, so all but the shortest clips need a link instead. Use the attachment checker and transfer time calculator to plan the delivery.
Video files are almost always too big to email. FileDue hands the client one link — no size limit — that unlocks only after they pay.
Create a paid delivery link →