Convert bits and bytes between decimal and binary units, from bytes to exabytes and exbibytes. Keep large values precise with exact arithmetic, clearly marked rounding and downloadable results.
| Unit | Name | System | Value |
|---|
≈ marks a rounded value. The report includes every exact decimal conversion.
Calculations run on your device using exact integer arithmetic. No values or files are uploaded, no account is needed and no calculation history is stored. Exact decimal output makes rounding visible instead of silently losing digits in large quantities.
This tool uses kB for the decimal kilobyte, often written KB: 1 kB = 1,000 bytes. KiB is the binary kibibyte: 1 KiB = 1,024 bytes. Likewise MB uses 1,000² bytes and MiB uses 1,024² bytes. Labels in other software can be ambiguous, so select the definition you intend.
Yes. One byte (B) is eight bits (bit). Mbit means megabits and MB means megabytes. The converter supports unprefixed bits and bytes, decimal prefixes kilo through exa, and binary prefixes kibi through exbi: 26 units in total.
Input is parsed as decimal text and calculations use BigInt integer ratios, without floating-point conversion. All supported ratios have terminating decimal expansions, so the exact field and report show their complete values. The other result and comparison table use up to 0, 2, 6 or 12 decimal places with half-up rounding. An approximation mark means digits were rounded, including small values that display as zero.
Use at most 100 decimal digits total with at most 30 after the decimal point. Zero, fractions and leading zeros are supported; a dot is the decimal separator. Negative values, signs, exponents, commas, spaces inside numbers and unit suffixes are rejected. Fractional bits and bytes are mathematical quantities, not claims about how a real file is stored.
No. It converts quantities only. It does not measure transfer speed, account for filesystem allocation, compression, metadata or reserved disk space. Swapping units leaves the typed amount unchanged and clears the previous result until you recalculate.
No. The tool calculates in your browser without network requests or calculation history. Copying and downloading happen only when you choose. The external NIST link opens its documentation when selected; your entered amount is not added to that link.
