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📐 File Size Converter

Convert between bytes, KB, MB, GB and TB instantly. Switch between binary (1024) and decimal (1000) units.

✓ All units at once ✓ Binary & decimal ✓ Instant calculation

Unit System

Binary (1024) — KiB, MiB, GiB

Decimal (1000) — KB, MB, GB

Enter Value

From Unit

Bytes (B)—

Kilobytes (KB)—

Megabytes (MB)—

Gigabytes (GB)—

Terabytes (TB)—

Bits—

💡 Why two systems? Binary (1024-based) is how operating systems calculate file sizes — what you see in Windows/Mac file properties. Decimal (1000-based) is how storage manufacturers advertise capacity (e.g. a "1TB" drive). This is why a "1TB" drive shows as ~931GB in your operating system.