Plain Math Tools

GB to TB

1 GB = 0.001 TB. Windows counts in 1,024s instead, so there 1 GB = 0.0009765625 TB. Enter any amount below to convert it.

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Decimal (drives, networks, macOS)

Binary (Windows, RAM)

Bits (connection speeds)

Why does my drive look smaller?

Windows will show about

How long will a download take?

At full speed it takes

Common GB to TB conversions

GBTB (decimal)TB (Windows)
1 GB0.0010.0009765625
10 GB0.010.009765625
100 GB0.10.09765625
500 GB0.50.48828125
1,000 GB10.9765625
5,000 GB54.8828125
10,000 GB109.765625
100,000 GB10097.65625
1,000,000 GB1,000976.5625

Decimal units count in thousands (1 GB = 1,000 MB). Binary units count in 1,024s (1 GiB = 1,024 MiB). Windows uses binary but labels it KB, MB and GB, which is why the same file or drive can show two different sizes.

Speeds are in bits: 8 bits make a byte, so a 100 Mbps connection moves at most 12.5 MB per second. Real downloads usually run somewhat slower than the advertised speed.