mph to km/h Converter
Free online mph to km/h converter. Instantly convert miles per hour to kilometers per hour with formula, conversion table, and step-by-step examples.
Reviewed by UnitKick Editorial Team · Last updated
Conversion Table
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 30 | 48.28 |
| 60 | 96.561 |
| 100 | 160.934 |
How to Convert Miles per Hour to Kilometers per Hour
To convert miles per hour to kilometers per hour, use the following formula:
km/h = mph × 1.60934
Example: Convert 30 mph to km/h:
30 mph = 48.28 km/h
When to Use This MPH to KMH Converter
Use this miles per hour to kilometers per hour converter when speed conversions help compare travel, running, cycling, weather, aviation, marine, and engineering values.
- Comparing vehicle, cycling, or running speeds across metric and US units.
- Converting wind, marine, or aviation speed references.
- Translating engineering or physics values between meters per second and everyday units.
The formula: km/h = mph × 1.60934
Practical example: For example, 30 mph equals 48.28 kmh.
Free Online Conversion Steps
Step 1: enter your MPH value. Step 2: read the KMH result.
This online converter is free. It shows the answer, formula, and common values.
Unit Conversion Formula
km/h = mph × 1.60934.
Keep extra digits while you calculate. Round only your final answer.
Unit Type and Name
MPH and KMH are units in the speed category.
Use the full converter name when you need a clear source: mph to km/h Converter.
HTTPS Privacy Note
UnitKick loads over HTTPS. The conversion runs in your browser. Your value is not sent to a login form.
Accuracy and Rounding Notes
Speed conversions combine distance and time units. Keep the same time base when comparing results.
For navigation, racing, or engineering work, keep more decimals than you would for everyday travel estimates.
Measurement Standards
UnitKick checks key formulas against public measurement sources. NIST provides guidance in the United States. BIPM maintains the SI unit reference.