File Size ConverterConvert file sizes between bytes, KB, MB, GB and TB in decimal (1000) and binary (1024) units, or drop a file to see its exact size.
Download Time Calculator
Internet speeds are sold in megabits per second, but file sizes are in megabytes — a factor of 8 apart. Enter both and this calculator converts them, adds a realistic overhead allowance and shows the expected time, plus a comparison table of common speeds.
Runs entirely in your browser. Your input and files are not uploaded to any server.
How to use
- Enter the file size and unit.
- Enter your connection speed and its unit.
- Adjust the overhead if you know your real-world efficiency.
Examples
Game download
80 GB at 100 Mbps with 10% overhead ≈ 1 h 58 min.
Video upload
2 GB at 20 Mbps upload ≈ 14 min 49 s.
Privacy
Your files and text stay in your browser while you use this tool, and ads or anonymous visit statistics do not receive them. Only your favorites and recent tools are saved on your device. Privacy policy
Want proof? Check it with your browser’s Network tab: How to check that a tool does not upload your files
Frequently asked questions
Why is my real download slower?
Server limits, Wi-Fi quality, other devices on the network and distance to the server all matter. The overhead setting covers protocol headers, not these factors.
Mbps or MB/s?
Mbps is megabits per second (what providers advertise). MB/s is megabytes per second (what download managers often show). 1 MB/s = 8 Mbps.
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