How fast is 18 mph in km/h?

18 mph = 29 km/h. Multiply mph by 1.60934 to convert.

What is 18 mph in m/s?

18 mph = 8.05 m/s. Useful for physics calculations.

Multiply by 1.6 (or more precisely 8/5): 18 × 1.6 = 28.8 km/h. Exact answer: 29 km/h.

18 mph equals 29 km/h.

Formula: mph × 1.60934 = km/h

18 mph =

29km/h

m/s

8 m/s

knots

15.6 kn

Computed to 3 decimal places using factor 1.60934. For engineering or safety-critical uses verify against a calibrated reference.

Reference table

miles per hour (mph)	kilometres per hour (km/h)	m/s	knots
12 mph	19.3 km/h	5.4 m/s	10.4 kn
13 mph	20.9 km/h	5.8 m/s	11.3 kn
14 mph	22.5 km/h	6.3 m/s	12.2 kn
15 mph	24.1 km/h	6.7 m/s	13 kn
16 mph	25.7 km/h	7.2 m/s	13.9 kn
17 mph	27.4 km/h	7.6 m/s	14.8 kn
18 mph	29 km/h	8 m/s	15.6 kn
19 mph	30.6 km/h	8.5 m/s	16.5 kn
20 mph	32.2 km/h	8.9 m/s	17.4 kn
21 mph	33.8 km/h	9.4 m/s	18.2 kn
22 mph	35.4 km/h	9.8 m/s	19.1 kn
23 mph	37 km/h	10.3 m/s	20 kn
24 mph	38.6 km/h	10.7 m/s	20.9 kn

By use case

Urban

school zone / city

Highway

posted US limits

Autobahn

recommended limits

Supercar top

flagship speeds

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FAQ

How fast is 18 mph in km/h?: 18 mph = 29 km/h. Multiply mph by 1.60934 to convert.
What is 18 mph in m/s?: 18 mph = 8.05 m/s. Useful for physics calculations.
How to convert 18 mph to km/h mentally?: Multiply by 1.6 (or more precisely 8/5): 18 × 1.6 = 28.8 km/h. Exact answer: 29 km/h.

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