Mile per Hour to Kilometer per Hour

Convert mile per hour to kilometer per hour instantly. Type in either field — results update live.

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Speed Mile per Hour Kilometer per Hour

1 mile per hour = 1.6093439999 kilometers per hour

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Format

Selected mph values converted to km/h using the exact factor from this tool.

Exact conversion factors in both directions, plus a worked example.

1 mph = 1.6093439999 km/h

1 km/h = 0.6213711923 mph

To convert mile per hour to kilometer per hour, multiply by 1.6093439999.

To convert kilometer per hour to mile per hour, multiply by 0.6213711923.

Example: convert 10 mph to km/h

10 × 1.6093439999 = 16.0934399987 km/h

Short background on the units used in this conversion.

Miles per hour measure how many statute miles are traveled in one hour — 1 mph equals 0.44704 m/s.

Miles per hour dominate US and UK road speed limits, vehicle gauges, and aviation wind reports.

Kilometers per hour express how many kilometers are covered in one hour — 1 km/h equals 1/3.6 m/s.

Kilometers per hour are the default on vehicle speedometers and road signs outside the United States.

How many kilometers per hour are in one mile per hour?

One mile per hour equals 1.6093439999 kilometers per hour. Multiply your miles per hour value by 1.6093439999 to convert to kilometers per hour.

What is the conversion formula?

km/h = mph × 1.6093439999

The reverse is mph = km/h × 0.6213711923, using the same exact factors as this converter.

Is this Mile per Hour to Kilometer per Hour converter private?

Yes. All calculations run locally in your browser. Nothing you type is sent to a server.

Jump to any speed conversion starting from mile per hour — including the reverse direction and every other unit in our dataset.