File Size Converter
Calculators · Done in 3 steps
- 1Enter a file size
- 2
- 3
About
Convert between bytes, KB, MB, GB, TB and KiB, MiB, GiB (decimal vs binary) and bits, and estimate download time at any connection speed.
How to use it
- 1Enter a file size and choose its unit.
- 2Compare the decimal (×1000) and binary (×1024) values side by side.
- 3Enter your connection speed and an overhead allowance.
- 4Read the estimated download or upload time.
- You give
- A size with unit, a connection speed
- You get
- Size in every unit, exact bytes and bits, estimated transfer time
- Good to know
- Transfer time is an estimate: real speeds vary with network conditions, server limits and protocol overhead. Every input is saved in the page URL, so you can bookmark or share a result.
- Privacy
- Processed on your device. Nothing is uploaded, stored or logged.
- Last tested
- 2026-10-28
FAQ
Why does my 1 TB drive show as 931 GB?
Drive makers use decimal units (1 TB = 10¹² bytes). Windows divides by 1024³ and shows 931 “GB” — really 931 GiB.
Is 100 Mbps the same as 100 MB/s?
No. Mbps is megabits per second; divide by 8 for megabytes. 100 Mbps is about 12.5 MB/s.
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