Free tool · 📦 Bytes & bandwidth converter
How big, andhow long to move it?
The unit confusion behind "the backup window is too short" and "the disk is smaller than we bought" — resolved, with transfer time at any link speed.
Transfer time assumes a saturated link; real-world adds 20–30% protocol overhead.
What it checks
Everything we would look at first on a client call.
Free, no sign-up, no email gate. If the report shows red, the fix is written next to it — and we are one click away if you would rather we did it.
- Decimal (1000) and binary (1024) units side by side
- Bits vs bytes
- Transfer time at your link speed, 10 Mbps, 1 Gbps and 10 Gbps
FAQ
Common questions
Why is my 2 TB drive 1.81 TB?
Manufacturers use 10¹² bytes; Windows shows TiB (2⁴⁰). Both are "right".
How long does a 10 TB migration take on 1 Gbps?
About 22–24 hours saturated; plan 30 hours.