Bytes to TB Converter

Convert bytes to TB and TiB, the two ways drive sizes get reported. Use it to see why a new 1 TB drive shows about 931 GB in Windows.

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Terabytes (1 TB = 1,000,000,000,000 bytes)
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Tebibytes (1 TiB = 1,099,511,627,776 bytes)
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Convert other units

How to use the Bytes to TB Converter

  1. Enter the size in Bytes, for example the capacity shown in your disk tool.
  2. Press Convert.
  3. Read the TB value, with the TiB value underneath.

How it works

TB  = bytes ÷ 1,000,000,000,000
TiB = bytes ÷ 1,099,511,627,776
  • TB (terabyte): the SI unit, 1,000⁴ bytes, used on drive labels
  • TiB (tebibyte): the binary unit, 1,024⁴ bytes, used by Windows even though it writes "TB"

At the terabyte scale the gap between the two is almost 10%.

Examples

  • 2,000,000,000,000 bytes = 2 TB = 1.818989404 TiB.
  • 1,099,511,627,776 bytes = 1.099511628 TB = 1 TiB.

Bytes to TB conversion table

BytesTBTiB
250,000,000,0000.250.2273736754
500,000,000,0000.50.4547473509
1,000,000,000,00010.9094947018
1,099,511,627,7761.0995116281
2,000,000,000,00021.818989404
4,000,000,000,00043.637978807
8,000,000,000,00087.275957614
12,000,000,000,0001210.91393642
16,000,000,000,0001614.55191523
20,000,000,000,0002018.18989404

Drive sizes as Windows shows them

Advertised capacityShown in Windows
500 GB465 GB
1 TB931 GB
2 TB1.81 TB
4 TB3.63 TB
8 TB7.27 TB

Nothing is missing. The drive holds exactly the advertised number of bytes, and Windows divides by 1,024 at each step instead of 1,000. The figures above are rounded down, as Windows shows them. Formatting then uses a small extra amount for the file system.

Limitations

  • Negative values give an error.
  • Results are rounded to 10 significant digits for display.
  • A formatted drive shows a little less free space than its capacity, because the file system uses some of it. This converter does not account for that.

Frequently asked questions

How many bytes are in a terabyte?

1,000,000,000,000 in SI units. A tebibyte (TiB) is 1,099,511,627,776 bytes.

Why does my 2 TB drive show 1.81 TB?

The drive holds 2×10^12 bytes. Windows divides by 1,024⁴, which gives about 1.82 TiB, but labels it "TB".

How many GB are in a TB?

1,000 GB in SI units, or 1,024 GiB in 1 TiB.

Often used together with the Bytes to TB.