72 miles per hour to kilometers per hour
115.9 km/h
72 mph = 115.9 km/h.
kilometers per hour
115.9km/h
72 mph = 115.9 km/h
The short answer
How many kilometers per hour is 72 miles per hour?
72 mph = 115.9 km/h. 1 miles per hour = 1.609344 kilometers per hour, so the working is 72 × 1.609344 = 115.9.
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 72 × 1.609344 = 115.9
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 | 116 | +0.12723 |
| 1 decimal | 115.9 | +0.02723 |
| 2 decimals | 115.87 | −0.00277 |
Round trip: take 115.9 km/h back the other way and you land on 72.0169 mph — a drift of 0.0169 mph. That gap is the rounding, not the conversion.
What 72 mph looks like
70 mph
The UK national limit for cars on motorways and dual carriageways is 70 miles per hour unless signs say otherwise.
Frequently asked questions
What is 72 miles per hour in kilometers per hour?
72 miles per hour is 115.9 kilometers per hour. 1 miles per hour = 1.609344 kilometers per hour, so the working is 72 × 1.609344 = 115.9.
How accurate is 115.9 km/h?
Rounding to 115.9 km/h and converting straight back gives 72.0169 mph, a drift of 0.0169 mph from the 72 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 →