30 knots to miles per hour
34.52 mph
30 kn = 34.52 mph.
miles per hour
34.52mph
30 kn = 34.52 mph
In short
How many miles per hour is 30 knots?
30 kn = 34.52 mph. 1 knot = 1.150779 miles per hour, so the working is 30 × 1.150779 = 34.52.
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 30 × 1.150779 = 34.52
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 | 35 | +0.47662 |
| 1 decimal | 34.5 | −0.02338 |
| 2 decimals | 34.52 | −0.00338 |
Round trip: take 34.52 mph back the other way and you land on 29.9971 kn — a drift of 0.0029 kn. That gap is the rounding, not the conversion.
Frequently asked questions
What is 30 knots in miles per hour?
30 knots is 34.52 miles per hour. 1 knot = 1.150779 miles per hour, so the working is 30 × 1.150779 = 34.52.
How accurate is 34.52 mph?
Rounding to 34.52 mph and converting straight back gives 29.9971 kn, a drift of 0.0029 kn from the 30 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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