31 knots to miles per hour
35.67 mph
31 kn = 35.67 mph.
miles per hour
35.67mph
31 kn = 35.67 mph
In short
How many miles per hour is 31 knots?
31 kn = 35.67 mph. 1 knot = 1.150779 miles per hour, so the working is 31 × 1.150779 = 35.67.
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 knot = 1.150779 miles per hour 31 × 1.150779 = 35.67
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 (mph) | Off by |
|---|---|---|
| Whole number | 36 | +0.32584 |
| 1 decimal | 35.7 | +0.02584 |
| 2 decimals | 35.67 | −0.00416 |
Round trip: take 35.67 mph back the other way and you land on 30.9964 kn — a drift of 0.0036 kn. That gap is the rounding, not the conversion.
What 31 kn looks like
34 kn
Gale force, the bottom of Beaufort force 8, and the wind speed at which a tropical storm gets its name.
Frequently asked questions
What is 31 knots in miles per hour?
31 knots is 35.67 miles per hour. 1 knot = 1.150779 miles per hour, so the working is 31 × 1.150779 = 35.67.
How accurate is 35.67 mph?
Rounding to 35.67 mph and converting straight back gives 30.9964 kn, a drift of 0.0036 kn from the 31 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
Knots to MPH Converter
Convert knots to miles per hour — boat speed, wind speed, and aviation.
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