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Free MPH to KM/H Converter

Convert speed between miles per hour and kilometers per hour. Type in either box for an instant result, and scan the table for common speed limits.

1 mph = 1.609 km/h

Pick any units and edit either box — it converts instantly in your browser.

Quick answer

To convert miles per hour to kilometers per hour, multiply by 1.609344, because one mile is 1.609344 km. For example, 60 mph = 96.56 km/h. To convert km/h back to mph, divide by 1.609344 (or multiply by 0.621371).

Formula & method

km/h = mph × 1.609344
  • mph — speed in miles per hour
  • 1.609344 — kilometres in one mile (exact)

Inverse: mph = km/h × 0.621371.

Common speeds (mph to km/h)

Miles/hour (mph)Kilometers/hour (km/h)
10 mph16.09 km/h
20 mph32.19 km/h
30 mph48.28 km/h
50 mph80.47 km/h
60 mph96.56 km/h
70 mph112.65 km/h
100 mph160.93 km/h

Examples

Example 1: A 30 mph limit
Input
30 mph
Result
48.28 km/h
Why
30 × 1.609344 = 48.28.
Example 2: Highway speed
Input
60 mph
Result
96.56 km/h
Why
60 × 1.609344 = 96.56.
Example 3: 100 mph
Input
100 mph
Result
160.93 km/h
Why
100 × 1.609344 = 160.93.

When to use this tool

  • Reading a speedometer or speed limit in the other unit while driving abroad.
  • Comparing vehicle top speeds across regions.
  • Converting pace and speed for sports or fitness.

Common mistakes

  • Using 1.6 for exact work. The precise factor is 1.609344.
  • Reversing the direction — mph × 1.609 gives km/h; km/h × 0.621 gives mph.
  • Assuming speed limits convert to round numbers; 50 mph is 80.5 km/h, not exactly 80.

Frequently asked questions

How do I convert mph to km/h?

Multiply the speed in mph by 1.609344. For a rough estimate, multiply by 1.6.

How do I convert km/h to mph?

Divide the km/h value by 1.609344, or multiply by 0.621371. You can also type into the km/h box here.

What is 100 km/h in mph?

About 62.1 mph (100 × 0.621371).

Why isn’t the conversion a round number?

Because a mile and a kilometre aren’t simple multiples of each other, most speed conversions land on decimals.

Is this the same factor as miles to kilometers?

Yes. Speed is just distance over time, so mph to km/h uses the same 1.609344 factor as miles to kilometers.

What are some common speed limits in mph vs. km/h?

US residential: 25 mph ≈ 40 km/h. US highway: 65 mph ≈ 105 km/h. UK/EU highway: often 120–130 km/h ≈ 75–81 mph.

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Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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