Data Size Calculator

Free Data Size Calculator calculator with clear step-by-step results.

About Data Size Calculator

Converts a data quantity into bytes and back out in both the decimal units storage vendors use and the binary units operating systems report. The 7% gap between a gigabyte and a gibibyte is why a drive sold as 1 TB shows as roughly 931 GB once formatted.

Formulas

Decimal units

1 KB = 1,000 B, 1 MB = 10^6 B, 1 GB = 10^9 B

Binary units

1 GiB = 1,024^3 B = 1,073,741,824 B

Worked example

With the default values below, Data Size Calculator returns Bytes of 4,700,000,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Quantityminimum 0: 4.7
Unitone of Bytes, Kilobytes (decimal, 1000), Megabytes (decimal), Gigabytes (decimal), Terabytes (decimal), Gibibytes (binary, 1024): Gigabytes (decimal)

Results

Bytes: 4,700,000,000 B
Megabytes (decimal): 4,700.0000 MB
Gibibytes (binary): 4.377216 GiB
Bits: 37,600,000,000 b

Step by step

1Values used
2Decimal units
3Binary units
4Bytes= 4,700,000,000 B
5Megabytes (decimal)= 4,700.0000 MB
6Gibibytes (binary)= 4.377216 GiB
7Bits= 37,600,000,000 b

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does my drive show less space than advertised?

Manufacturers count decimal gigabytes while most operating systems display binary gibibytes. A 1 TB drive is 10^12 bytes, which is 931 GiB - before filesystem overhead.

Are bits and bytes interchangeable?

No. Network speeds are quoted in bits per second and file sizes in bytes, a factor of eight apart. A 100 Mbps link transfers at most about 12.5 MB per second.