Convert GB to KB | GB ↔ KB Converter (1000 vs 1024)

Convert GB to KB (and KB to GB) — fast, accurate, and free

Use this free tool to convert GB to KB and convert KB to GB instantly. Choose between decimal (1000-based, SI) and binary (1024-based, IEC) systems for results that match drive labels, operating systems, and technical tools.

What’s the difference between 1000 and 1024?

Decimal (SI): 1 GB = 1000 MB, 1 MB = 1000 KB → 1 GB = 1,000,000 KB.
Binary (IEC): 1 GiB = 1024 MiB, 1 MiB = 1024 KiB → 1 GiB = 1,048,576 KiB.
Manufacturers commonly use decimal; many OS tools display binary. Pick the system that matches your use case.

Formulas to convert GB to KB

Decimal (SI):

KB = GB × 1,000,000

Binary (IEC):

KiB = GiB × 1,048,576

Reverse direction (KB to GB) is division by the same factor.

Examples: convert GB to KB

1 GB (decimal) → 1,000,000 KB
0.5 GB (decimal) → 500,000 KB
1 GiB (binary) → 1,048,576 KiB

Examples: convert KB to GB

2,000,000 KB (decimal) → 2 GB
1,048,576 KiB (binary) → 1 GiB
750,000 KB (decimal) → 0.75 GB

GB vs GiB and KB vs KiB

GB/KB are decimal units (×1000) and GiB/KiB are binary units (×1024). This tool shows both systems so your numbers align with vendor specs or OS readouts.

FAQ

Q: Should I use 1000 or 1024?
A: Use 1000 (SI) for marketing capacities and vendor datasheets. Use 1024 (IEC) to match OS tools and engineers’ calculations.

Q: Is KB the same as KiB?
A: No. KB is decimal; KiB is binary. They’re close but not identical. The difference scales up at GB/TB ranges.

Q: Can I copy the result?
A: Yes — use the Copy button to copy the formatted conversion string.

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Gigabyte to KB Converter