Gigabyte Converter

Decimal (SI) uses powers of 1,000: 1 GB = 1,000 MB. Binary (IEC) uses powers of 1,024: 1 GiB = 1,024 MiB. Hard drive manufacturers and network speeds use decimal, while operating systems and RAM typically use binary. This difference explains why drives appear smaller than advertised.

The drive manufacturer labels 1 TB as 1,000,000,000,000 bytes (decimal). Your operating system divides by 1,024 three times (binary), giving 931.32 GiB. Both numbers represent the same amount of storage, just measured differently.

Use decimal if you are comparing against manufacturer specifications, network speeds, or scientific measurements. Use binary if you need values that match what your operating system reports, or when calculating RAM capacity.

In decimal: 1 GB = 1,000 MB exactly. In binary: 1 GiB = 1,024 MiB. Most people use the decimal conversion (1,000 MB) for everyday purposes.

In decimal: 1 TB = 1,000 GB exactly. In binary: 1 TiB = 1,024 GiB. When shopping for hard drives or SSDs, the decimal conversion (1,000 GB per TB) is the standard used by manufacturers.

Technically no. GB (gigabyte) is the decimal unit (1,000^3 bytes), while GiB (gibibyte) is the binary unit (1,024^3 bytes). However, many systems use "GB" loosely to mean either. This calculator lets you choose which interpretation to use.

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