Speed, Distance & Time Calculator
Solve speed, distance or travel time from the other two — in mph, km/h or knots — including nautical miles and boat fuel use.
How to use
- 1Choose what to calculate and the units.
- 2Enter the other two values; add fuel burn per hour for boats or aircraft.
How it's calculated
Speed = distance ÷ time; distance = speed × time; time = distance ÷ speed. 1 nautical mile = 1.852 km; 1 knot = 1 nautical mile per hour.
Frequently asked questions
How do I enter hours and minutes?
Use decimals — 1 h 30 min is 1.5 hours.
What's a knot?
One nautical mile per hour (1.852 km/h or about 1.15 mph), used at sea and in aviation.
Why is a nautical mile longer than a mile?
It's defined from one minute of latitude on Earth — 1,852 m — which makes navigation with charts easier.