3 miles per hour to kilometers per hour
4.8 km/h
3 mph = 4.8 km/h.
kilometers per hour
4.8km/h
3 mph = 4.8 km/h
The short answer
How many kilometers per hour is 3 miles per hour?
3 mph = 4.8 km/h. 1 miles per hour = 1.609344 kilometers per hour, so the working is 3 × 1.609344 = 4.8.
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 3 × 1.609344 = 4.8
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 | 5 | +0.17197 |
| 1 decimal | 4.8 | −0.02803 |
| 2 decimals | 4.83 | +0.00197 |
Round trip: take 4.8 km/h back the other way and you land on 2.9826 mph — a drift of 0.0174 mph. That gap is the rounding, not the conversion.
What 3 mph looks like
3 mph
A healthy adult walking at a comfortable pace covers roughly 3.1 miles per hour, about 1.4 metres every second.
Frequently asked questions
What is 3 miles per hour in kilometers per hour?
3 miles per hour is 4.8 kilometers per hour. 1 miles per hour = 1.609344 kilometers per hour, so the working is 3 × 1.609344 = 4.8.
How accurate is 4.8 km/h?
Rounding to 4.8 km/h and converting straight back gives 2.9826 mph, a drift of 0.0174 mph from the 3 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 →