Data Transfer Calculator
Enter how much data you need to move and how long you have. This tool shows the average speed required. Handy for backups, migrations, and tight deadlines.
Enter a data size and a time to see the speed needed.
This is the sustained speed to finish exactly on time. Add headroom for overhead and slowdowns. Data is in bytes and speed in bits, so size is multiplied by 8.
How It Works
Set the data size and pick its unit. Then set the time you have. The required speed updates as you type, in both Mbps and MB/s.
The tool converts the data to bits, divides by your time in seconds, and reports the speed you would need to finish on time.
Because data is in bytes and speed is in bits, the factor of 8 appears again. Moving 1 gigabyte in one second needs 8 gigabits per second, not 1.
The Formula
Convert the data to bits by multiplying bytes by 8.
Divide by the time you have in seconds to get the speed in bits per second.
Scale to Mbps for the plan figure, or divide by 8 again for MB/s.
Worked Example
Say you must move 500 GB to a new server within 8 hours.
500 GB is 4,000,000,000,000 bits. Eight hours is 28,800 seconds.
Divide and you need about 139 Mbps sustained, which is roughly 17 MB/s. Now you know the connection the job requires.
Common Uses
- Planning a server migration inside a maintenance window.
- Checking whether a nightly backup can finish before morning.
- Sizing the connection needed for a large one-time transfer.
- Deciding whether to ship a drive instead of sending data over the wire.