20 miles per hour to kilometers per hour
32.2 km/h
20 mph = 32.2 km/h.
kilometers per hour
32.2km/h
20 mph = 32.2 km/h
The short answer
How many kilometers per hour is 20 miles per hour?
20 mph = 32.2 km/h. 1 miles per hour = 1.609344 kilometers per hour, so the working is 20 × 1.609344 = 32.2.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 miles per hour = 1.609344 kilometers per hour 20 × 1.609344 = 32.2
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (km/h) | Off by |
|---|---|---|
| Whole number | 32 | −0.18688 |
| 1 decimal | 32.2 | +0.01312 |
| 2 decimals | 32.19 | +0.00312 |
Round trip: take 32.2 km/h back the other way and you land on 20.0082 mph — a drift of 0.0082 mph. That gap is the rounding, not the conversion.
What 20 mph looks like
20 mph
Wales cut its default limit on restricted built-up roads from 30 to 20 mph in September 2023, the first UK nation to do so.
Frequently asked questions
What is 20 miles per hour in kilometers per hour?
20 miles per hour is 32.2 kilometers per hour. 1 miles per hour = 1.609344 kilometers per hour, so the working is 20 × 1.609344 = 32.2.
How accurate is 32.2 km/h?
Rounding to 32.2 km/h and converting straight back gives 20.0082 mph, a drift of 0.0082 mph from the 20 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
MPH to KM/H Converter
Miles per hour to kilometers per hour, with the speed limits you will actually meet.
Open the mph to km/h converter →