File Size Converter

Convert between bytes, KB, MB, GB and TB (binary and decimal) and estimate download times.

Size

Unit

B (binary): 15,72,864
KB (binary): 1,536
MB (binary): 1.5
GB (binary): 0.0015
TB (binary): 0
kB (decimal): 1,572.864
MB (decimal): 1.5729
GB (decimal): 0.0016
TB (decimal): 0

Windows and most upload forms use binary units (1 KB = 1024 bytes). Drive makers and macOS use decimal (1 kB = 1000 bytes) — that's why a “1 TB” disk shows about 931 GB.

How to use File Size Converter

1Enter your values — results update instantly as you type.
2Adjust any setting to compare options.
3Copy or download the result. Nothing is sent to a server.

About this tool

Convert between bytes, KB, MB, GB and TB (binary and decimal) and estimate download times. It works instantly in your browser with nothing to install. It's part of our free calculators, which work together — you can pass the result straight into related tools below.

Frequently asked questions

Is File Size Converter free?

Yes. There's no sign-up, no watermark and no usage limit.

Is my data stored?

No. Everything is calculated in your browser and nothing is sent to a server.

Does it work on mobile and offline?

Yes. It works in any modern browser on phones, tablets and computers, and keeps working offline once the page has loaded.