Knots to MPH Converter
Convert speed instantly, or use the same value to estimate travel time and distance.
Convert speed
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Travel time & distance
Knots to mph formula
mph = knots × 1.150779448. A knot means one nautical mile per hour. Because one international nautical mile is 1,852 meters and one statute mile is 1,609.344 meters, 10 knots equals about 11.5078 mph and exactly 18.52 km/h.
Common knots to mph chart
| Knots | MPH | km/h |
|---|---|---|
| 5 kn | 5.7539 mph | 9.26 km/h |
| 10 kn | 11.5078 mph | 18.52 km/h |
| 20 kn | 23.0156 mph | 37.04 km/h |
| 25 kn | 28.7695 mph | 46.3 km/h |
| 50 kn | 57.539 mph | 92.6 km/h |
Travel time and distance
At constant speed, nautical miles equal knots multiplied by hours. To solve for time, divide nautical miles by knots. The extra panel keeps that follow-up calculation beside the converter, but it is not a navigation or weather model.
What this estimate leaves out
Actual speed over ground can differ from speed through the water. Check route, weather, current, sea state, traffic, fuel, local rules, and safety guidance before a real trip. This page does not replace charts, instruments, or a voyage plan.
Frequently asked questions
How do I convert knots to mph?
Multiply knots by 1.150779448. For example, 10 knots is about 11.5078 mph.
How fast is one knot?
One knot is one nautical mile per hour, equal to about 1.15078 mph or exactly 1.852 km/h.
How do I calculate travel distance at a speed in knots?
Multiply speed in knots by travel time in hours. A speed of 10 knots for 3 hours covers 30 nautical miles, before allowing for wind, current, course, or stops.
How do I calculate travel time from knots and nautical miles?
Divide nautical miles by speed in knots. At 10 knots, a 30-nautical-mile trip takes 3 hours under the calculator's still-water assumption.
Does the travel estimate include wind or current?
No. It is simple speed-distance-time arithmetic. Actual travel time can change with current, wind, route, sea state, traffic, and stops.
Are my values uploaded?
No. Conversion and travel math run in this browser.