Convert between TB, TiB, GB, GiB and MB without mistakes.
Result
TB
1
TiB
0.909495
GB
1,000
GiB
931.322575
MB
1,000,000
MiB
953,674.316406
KB
1,000,000,000
KiB
976,562,500
B
1,000,000,000,000
Quick answer · example
Why does a 1 TB drive show as 931 GB?
Because the maker uses decimal TB (10¹² bytes) while Windows shows binary units even though it calls them GB: 1 TB is 931.32 GiB and 0.909 TiB. No space is missing; only the unit changes.
Calculation assumptions
Converts between decimal units (KB, MB, GB, TB: powers of 1000) and binary units (KiB, MiB, GiB, TiB: powers of 1024). It explains why a 1 TB drive shows as 931 GB in Windows.
1 KB = 1000 B · 1 KiB = 1024 B · 1 TB = 10¹² B · 1 TiB = 2⁴⁰ B
Converts between decimal units (KB, MB, GB, TB: powers of 1000) and binary units (KiB, MiB, GiB, TiB: powers of 1024). It explains why a 1 TB drive shows as 931 GB in Windows.
All amounts use the same currency of your choice. These are estimates, not measurements or offers.
How to use this calculator
Convert any amount between decimal and binary units to compare drive capacities, backup sizes or cloud storage quotas. Type the amount, pick its unit and you will see its equivalent in every other unit.
Worked example
1 TB = 1,000,000,000,000 bytes.
1 GiB = 1,073,741,824 bytes.
10¹² ÷ 1,073,741,824 = 931.32 GiB.
Example result
GB
1,000
GiB
931.322575
Interpreting the result
Drive makers, data plans and most cloud services use decimal units. Windows and some Linux tools show binary units, sometimes labelled GB. macOS has used decimal units since 2009, which is why the same drive shows as 1 TB there. To compare two figures, convert them to the same unit first.
Frequently asked questions
How many MB are in a GB?
1000 MB in decimal units. In binary, 1 GiB has 1024 MiB.
Which unit does internet speed use?
Megabits per second (Mbps), not megabytes. Divide by 8 to get MB/s.
What is a PiB?
A pebibyte: 2⁵⁰ bytes, about 1.126 PB. It is used mainly in enterprise storage.