8 knots to miles per hour
9.21 mph
8 kn = 9.21 mph.
miles per hour
9.21mph
8 kn = 9.21 mph
In short
How many miles per hour is 8 knots?
8 kn = 9.21 mph. 1 knot = 1.150779 miles per hour, so the working is 8 × 1.150779 = 9.21.
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 8 × 1.150779 = 9.21
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 | 9 | −0.20624 |
| 1 decimal | 9.2 | −0.00624 |
| 2 decimals | 9.21 | +0.00376 |
Round trip: take 9.21 mph back the other way and you land on 8.0033 kn — a drift of 0.0033 kn. That gap is the rounding, not the conversion.
Frequently asked questions
What is 8 knots in miles per hour?
8 knots is 9.21 miles per hour. 1 knot = 1.150779 miles per hour, so the working is 8 × 1.150779 = 9.21.
How accurate is 9.21 mph?
Rounding to 9.21 mph and converting straight back gives 8.0033 kn, a drift of 0.0033 kn from the 8 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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