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Data Storage / File Size Converter

Convert between bits, bytes, KB, MB, GB, TB — including the 1000 vs. 1024 distinction.

Enter your values to calculate your result.

Storage manufacturers typically advertise capacity using the decimal (1000-based) definition, while some operating systems report file/drive sizes using the binary (1024-based) definition but still label it "GB" — this is why a drive can show less free space than its advertised capacity. Pick the unit that matches what you're comparing against.

Formula

Every unit converts through bytes (the base unit). This calculator keeps two conventions distinct: KB/MB/GB/TB use the SI decimal definition (1 KB = 1000 bytes), while KiB/MiB/GiB/TiB use the IEC binary definition (1 KiB = 1024 bytes) — software disagrees about which one a plain "KB" or "GB" means, so both are offered explicitly rather than guessing.

Frequently Asked Questions

Why are there both GB and GiB?

GB (gigabyte) conventionally means 1,000³ bytes, while GiB (gibibyte) means 1,024³ bytes — about 7.4% more. Pick whichever matches the number you're trying to match (e.g. a drive's advertised capacity vs. what your OS reports).

Does this cover the Mbps ↔ MB/s conversion?

No — that's a data transfer RATE (bits per second), not a file size. Use the Data Transfer Converter for that.

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