42.20 kilometers to miles
26.22 mi
42.20 km = 26.22 mi.
miles
26.22mi
42.20 km = 26.22 mi
In short
How many miles is 42.20 kilometers?
42.20 km = 26.22 mi. 1 kilometer = 0.621371 miles, so the working is 42.20 × 0.621371 = 26.22.
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 kilometer = 0.621371 miles 42.20 × 0.621371 = 26.22
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 (mi) | Off by |
|---|---|---|
| Whole number | 26 | −0.22186 |
| 1 decimal | 26.2 | −0.02186 |
| 2 decimals | 26.22 | −0.00186 |
Round trip: take 26.22 mi back the other way and you land on 42.1970 km — a drift of 0.0030 km. That gap is the rounding, not the conversion.
What 42.20 km looks like
42 km
The marathon has been fixed at 42.195 km since 1921, a distance inherited from the 1908 London Olympics.
Frequently asked questions
What is 42.20 kilometers in miles?
42.20 kilometers is 26.22 miles. 1 kilometer = 0.621371 miles, so the working is 42.20 × 0.621371 = 26.22.
How accurate is 26.22 mi?
Rounding to 26.22 mi and converting straight back gives 42.1970 km, a drift of 0.0030 km from the 42.20 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
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