Unit Converter
Convert a value between length, mass, temperature, data-size, and time units.
- Runs locally in your browser
- No upload required
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Supported formats
Privacy
Runs entirely in your browser. Your input is never uploaded, stored, or sent to a third party.
1 km equals 0.621371192237 mi.
How it works
- Confirmed both units measure length.
- Converted the source value to the dimension's base unit, then to the target unit.
- Applied the exact factor and rounded to 12 significant digits.
1 km = 0.621371192237 miMethodology
- Convert by multiplying the input value by the ratio of the target unit to the source unit, expressed in a common base.
- Keep SI decimal prefixes (powers of 1000) and IEC binary prefixes (powers of 1024) as separate families so they can never be conflated.
- Apply the temperature scales with their affine offsets instead of a plain ratio.
Usage
- Enter the numeric value.
- Choose the source and target units.
- Read the converted value and the conversion formula.
Examples
These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.
Kilometres to miles
{
"value": 1,
"from": "km",
"to": "mi"
}Celsius to Fahrenheit
{
"value": 100,
"from": "c",
"to": "f"
}Mebibytes to megabytes
{
"value": 1,
"from": "mib",
"to": "mb"
}Limitations
Decimal vs. binary data units
The IEC binary prefixes (KiB, MiB, GiB, TiB) are powers of 1024; the SI decimal prefixes (KB, MB, GB, TB) are powers of 1000. Both appear in documentation, so this tool supports both and keeps them separate.
Frequently asked questions
- Why does 1 MiB not equal 1 MB?
- MiB is 1024² bytes while MB is 1000² bytes. Disk and network vendors often use decimal prefixes, which is why the two numbers differ.
Sources
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