Data transfer rate converter — Mbit/s, MB/s and GB/h

Internet plans are sold in megabits, download windows count in megabytes, and the gap between them is a factor of eight. This page shows both at once, plus how much a link moves per hour.

How to use it

1
Type into any row — say Mbit/s or MB/s. The results appear immediately, no button needed.
2
Need a combined figure? Fill in two rows, for example Mbit/s and Gbit/s, and they are added together before converting.
3
Set how many digits you want (4–12) and click a result to copy the plain number.

Exact conversion factors

These are the definitions the calculator uses. Nothing here is rounded for convenience — where a value is exact by definition, it says so.

1 byte = 8 bits, so 1 MB/s = 8 Mbit/s
100 Mbit/s = 12.5 MB/s = 45 GB per hour
1 Gbit/s = 125 MB/s · 1 Gbit/s = 450 GB per hour
1 MiB/s = 8.388608 Mbit/s — binary megabyte, 4.86 percent larger
A 4 GB file over 100 Mbit/s takes 320 s at full speed

FormulaMB/s = Mbit/s ÷ 8 · Mbit/s = MB/s × 8 · GB/h = GB/s × 3600 · MiB/s = MB/s × 0.95367432

Data transfer rate conversion table — every unit

One of each unit, converted into the three units people ask for most.

Unit	Mbit/s	MB/s	Gbit/s
1 bit/s	0.000001 Mbit/s	0.000000125 MB/s	0.000000001 Gbit/s
1 kbit/s	0.001 Mbit/s	0.000125 MB/s	0.000001 Gbit/s
1 Mbit/s	1 Mbit/s	0.125 MB/s	0.001 Gbit/s
1 Gbit/s	1 000 Mbit/s	125 MB/s	1 Gbit/s
1 B/s	0.000008 Mbit/s	0.000001 MB/s	0.000000008 Gbit/s
1 kB/s	0.008 Mbit/s	0.001 MB/s	0.000008 Gbit/s
1 MB/s	8 Mbit/s	1 MB/s	0.008 Gbit/s
1 GB/s	8 000 Mbit/s	1 000 MB/s	8 Gbit/s
1 MiB/s	8.38861 Mbit/s	1.04858 MB/s	0.00838861 Gbit/s
1 GB/h	2.22222 Mbit/s	0.277778 MB/s	0.00222222 Gbit/s

Mbit/s → MB/s, Gbit/s — quick values

Mbit/s	MB/s	Gbit/s
0.5 Mbit/s	0.0625 MB/s	0.0005 Gbit/s
1 Mbit/s	0.125 MB/s	0.001 Gbit/s
2 Mbit/s	0.25 MB/s	0.002 Gbit/s
3 Mbit/s	0.375 MB/s	0.003 Gbit/s
5 Mbit/s	0.625 MB/s	0.005 Gbit/s
10 Mbit/s	1.25 MB/s	0.01 Gbit/s
20 Mbit/s	2.5 MB/s	0.02 Gbit/s
25 Mbit/s	3.125 MB/s	0.025 Gbit/s
50 Mbit/s	6.25 MB/s	0.05 Gbit/s
100 Mbit/s	12.5 MB/s	0.1 Gbit/s
250 Mbit/s	31.25 MB/s	0.25 Gbit/s
1 000 Mbit/s	125 MB/s	1 Gbit/s

How this converter works

Providers advertise in bits because the number looks eight times bigger. A "100 megabit" line delivers 12.5 MB/s at best, and real transfers land lower once protocol overhead, Wi-Fi and the far end are taken into account — treat these results as the ceiling, not the promise.

The GB per hour row answers the planning question directly: how much can this link actually shift overnight? A 50 Mbit/s upload moves 22.5 GB in an hour, so a 200 GB backup needs about nine hours of clean uptime.

Notes and abbreviations

Lowercase b means bit, uppercase B means byte — 8 bits
Mbps and Mbit/s are the same thing; MBps and MB/s are eight times faster
MiB/s uses the binary megabyte of 1 048 576 bytes

Questions

How fast is 100 Mbps in MB/s?

12.5 MB/s. Divide any bit rate by 8 to get the byte rate.

How long will a 25 GB download take on 200 Mbit/s?

200 Mbit/s is 25 MB/s, so 1000 seconds — about 17 minutes at full speed.

Why is my download slower than the advertised speed?

Protocol overhead, Wi-Fi losses and the server at the other end all cut into it. The figures here are the theoretical maximum.