Convert km/h to mph
1 km/h = 0.621371 mph · 1 mph = 1.60934 km/h · Exact by definition
1 km/h = 0.621371 mph
The same value in other units
- metre per second
- 0.277778 m/s
- knot
- 0.539957 kn
- minutes per kilometre
- 60 min/km
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Speed and pace
km/h to mph: conversion table
| kilometre per hour | mile per hour |
|---|---|
| 30 km/h | 18.6411 mph |
| 40 km/h | 24.8548 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 70 km/h | 43.496 mph |
| 80 km/h | 49.7097 mph |
| 90 km/h | 55.9234 mph |
| 100 km/h | 62.1371 mph |
| 110 km/h | 68.3508 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7783 mph |
| mile per hour | kilometre per hour |
|---|---|
| 30 mph | 48.2803 km/h |
| 40 mph | 64.3738 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 70 mph | 112.654 km/h |
| 80 mph | 128.748 km/h |
| 90 mph | 144.841 km/h |
| 100 mph | 160.934 km/h |
| 110 mph | 177.028 km/h |
| 120 mph | 193.121 km/h |
| 130 mph | 209.215 km/h |
How the conversion works
mph = km/h × 0.62137119
Both units are defined exactly, so the precision of the km/h to mph result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
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