About this calculator
The calculator also shows how long a 1 GB download takes at that speed.
How to use it
- Enter the value.
- Choose the unit it is in and the unit you want.
- Read the result, or see every unit in the table.
The formula
MB/s = Mbps ÷ 8
- bit
- the unit for speeds: Mbps
- byte
- 8 bits, the unit for file sizes: MB
Worked example
A 100 Mbps plan
- 100 Mbps ÷ 8 = 12.5 MB/s.
- A 1 GB file takes about 1.3 minutes at full speed.
What the result means
Real downloads are usually 10% to 20% slower than the plan speed.
Assumptions
- Full, steady speed.
Limitations
- Wi-Fi, network load and the server limit real speeds.
Frequently asked questions
Is 100 Mbps the same as 100 MB/s?
No: 100 Mbps is 12.5 MB/s.
How long to download 1 GB at 50 Mbps?
About 2.7 minutes.
What speed do I need for 4K video?
About 25 Mbps per stream.
Last reviewed on 3 October 2026. Found a mistake? Tell us.