File size and upload calculators
Free calculators for sending big files: how long an upload takes, whether a file fits an email or chat limit, and how big a video will be. Sourced and exact.
Calculators
- CalculatorUpload time calculatorEnter a file size and your upload speed to see how long the upload will take, with a realistic allowance for overhead. Works for any file, from 100 MB to 1 TB.Read more
- CalculatorAttachment size checkerCheck a file size against Gmail, Outlook.com, Slack, WhatsApp and Telegram limits in one go, including the base64 overhead that shrinks email limits, all sourced.Read more
- CalculatorVideo file size calculatorEstimate how big a video file will be from its bitrate and length, with presets for 1080p and 4K delivery files and Apple ProRes masters. Sourced figures.Read more
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