KPH to MPH Converter
Convert kilometers per hour to miles per hour using the standard factor.
Convert speed
Presets (km/h):
Result
Miles per hour: –
Factor used: 1 km/h = 0.621371 mph
Reverse (MPH → KPH)
KPH to MPH formula
The conversion is based on the relationship between kilometers and miles:
1 mile = 1.609344 kilometersmph = kph × 0.621371
Example: 120 km/h × 0.621371 ≈ 74.6 mph.
Quick reference table
| KPH | MPH |
|---|---|
| 30 | 18.6 |
| 50 | 31.1 |
| 60 | 37.3 |
| 80 | 49.7 |
| 100 | 62.1 |
| 120 | 74.6 |
FAQ
Is kph the same as km/h?
Yes. kph, km/h and kmh are commonly used for kilometers per hour. This tool accepts any of those forms.
Why do I need this?
If you drive in the UK/US with a car imported from a km/h country, or if your fitness tracker is set to km/h but you think in mph, this makes the conversion instant.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
1 mile = 1.609344 kilometers mph = kph × 0.621371
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.