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Data Size Converter

100% Free

Convert between bits, bytes, KB, MB, GB, TB and PB — in both decimal (×1000) and binary (KiB/MiB) units, side by side.

Decimal & Binary
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Result
1,000,000,000 B
1 GB • 8,000,000,000 bits
1 GB expressed in decimal and binary units
UnitDecimal (Base 10)Binary (Base 2)
B / B1,000,000,000 B1,000,000,000 B
KB / KiB1,000,000 KB976,562.5 KiB
MB / MiB1,000 MB953.67432 MiB
GB / GiB1 GB0.93132257 GiB
TB / TiB0.001 TB0.0009094947 TiB
PB / PiB0.000001 PB0.00000088817842 PiB

Decimal units (KB, MB, GB) use powers of 1000 — the convention drive makers use. Binary units (KiB, MiB, GiB) use powers of 1024 — what operating systems report. That's why a "1 TB" drive shows as about 931 GiB.

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How to Use

  1. 1 Type a value in the From field
  2. 2 Pick the source unit — bits, bytes, KB, MB, GB, or binary KiB/MiB
  3. 3 Choose the target unit in the To field
  4. 4 Read the converted result and the full decimal-vs-binary table
  5. 5 Copy the result or download the table as CSV

Features

  • Bits, bytes and every multiple up to petabytes
  • Decimal (×1000) and binary (×1024) units side by side
  • Instant conversion as you type — no submit button
  • Swap source and target units with one click
  • Copy the result or export the comparison table to CSV
  • Runs entirely in your browser — nothing is uploaded

Why it Matters

The same storage size is reported two different ways: drive makers count in powers of 1000 (a '1 TB' disk), while operating systems count in powers of 1024 (showing about 931 GiB). That mismatch confuses backups, bandwidth math, and capacity planning. Seeing both systems side by side makes the numbers add up.

★★★★★

Use Cases

Development & DevOps

Size files, payloads, and memory limits without guesswork

Capacity Planning

Reconcile advertised drive sizes with what the OS reports

Bandwidth Math

Convert megabits to megabytes for transfer-time estimates

Backups & Storage

Check whether a dataset fits before copying it

What this tool does

The Data Size Converter turns any data size into every other unit — bits, bytes, and the decimal and binary multiples up to petabytes. Enter a value, pick the units, and you get an instant conversion plus a side-by-side table showing the decimal (×1000) and binary (×1024) reading of the same amount.

How it works

Every value is first reduced to a canonical byte count (1 byte = 8 bits), then divided by each unit’s size. Decimal units use powers of 1000; binary units use powers of 1024. Because both columns derive from the same byte count, the decimal/binary gap you see is exactly the gap that confuses drive capacities and OS reports. The logic is a pure function, so results are deterministic.

Privacy

Everything runs locally in your browser. Nothing you enter is uploaded, logged, or stored.

Frequently Asked Questions

What's the difference between KB and KiB?
A kilobyte (KB) is 1,000 bytes, using the decimal system that storage manufacturers and networking use. A kibibyte (KiB) is 1,024 bytes, using the binary system that operating systems use internally. The gap widens at each level: a terabyte is 1,000,000,000,000 bytes, but a tebibyte is about 10% larger.
Why does my '1 TB' drive show as 931 GB?
The drive is genuinely 1 TB in decimal terms (1,000,000,000,000 bytes), but your operating system divides by 1024 at each step and labels the result GB even though it's really computing gibibytes. 1,000,000,000,000 ÷ 1024³ ≈ 931, so the same drive reads as about 931 'GB' (GiB) in the OS.
How many bits are in a byte?
Eight. This converter treats 1 byte as 8 bits, so 1 KB is 8,000 bits and 1 KiB is 8,192 bits. Network speeds are usually quoted in bits per second, while file sizes are in bytes — dividing by 8 converts between them.
Which system should I use?
Use decimal (KB, MB, GB) when matching advertised storage, network speeds, or SI conventions. Use binary (KiB, MiB, GiB) when matching what an operating system or programming language reports. The table shows both so you can pick the right one.
Is my data sent anywhere?
No. All conversion happens in your browser. Nothing you type is uploaded, logged, or stored.
📖

Want to understand the conversions?

Browse all guides →
KB vs KiB
data size

KB vs KiB: Decimal and Binary Data Units Explained

Why the same storage size is reported two ways. A complete guide to decimal (KB, MB, GB) and binary (KiB, MiB, GiB) data units, bits versus bytes, and how to convert between them without confusion.

23 Jun 2026

5 min read

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