1 miles per hour to kilometers per hour
1.6 km/h
1 mph = 1.6 km/h.
kilometers per hour
1.6km/h
1 mph = 1.6 km/h
The short answer
How many kilometers per hour is 1 miles per hour?
1 mph = 1.6 km/h. 1 miles per hour = 1.609344 kilometers per hour, so the working is 1 × 1.609344 = 1.6.
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 1 × 1.609344 = 1.6
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 | 2 | +0.39066 |
| 1 decimal | 1.6 | −0.00934 |
| 2 decimals | 1.61 | +0.00066 |
Round trip: take 1.6 km/h back the other way and you land on 0.9942 mph — a drift of 0.0058 mph. That gap is the rounding, not the conversion.
Frequently asked questions
What is 1 miles per hour in kilometers per hour?
1 miles per hour is 1.6 kilometers per hour. 1 miles per hour = 1.609344 kilometers per hour, so the working is 1 × 1.609344 = 1.6.
How accurate is 1.6 km/h?
Rounding to 1.6 km/h and converting straight back gives 0.9942 mph, a drift of 0.0058 mph from the 1 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 →