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All calculatorsMethodology

Speed Distance Time Calculator

Solve average speed, distance or travel time, then see the speed in mph, km/h, m/s and knots and the pace per mile and per kilometer.

Interactive calculator · Method SPEED-DISTANCE-TIME-1.0 · Last reviewed: 2026-11-04

Calculate your scenario

Average speed = distance ÷ time, distance = speed × time, time = distance ÷ speed.

Your inputs

Try an example

Default worked example. Edit the inputs to calculate your scenario.

Default worked example

Solved value Average speed 60 mph
Speed in mph and km/h 60 mph · 96.5606 km/h
Speed in m/s and knots 26.8224 m/s · 52.1386 kn
Distance 150 mi · 241.4016 km
Time 2:30:00 (2.5 h)
Pace 1:00 per mi · 0:37 per km

Speed = distance ÷ time = 150 mi ÷ 2.5 h = 60 mph.

How to use the calculator

Choose what to solve for, then enter the other two: distance with its unit, time as hours, minutes and seconds, or speed with its unit. Boxes for the value being solved are ignored.

What the result means

150 miles in 2 hours 30 minutes is an average of 60 mph (96.5606 km/h), a pace of exactly one minute per mile.

Formula and units

Average speed = distance ÷ time, distance = speed × time, time = distance ÷ speed. Time is entered as hours + minutes ÷ 60 + seconds ÷ 3,600. Exact conversions: 1 mi = 1,609.344 m, 1 nautical mile = 1,852 m, 1 mph = 0.44704 m/s, 1 km/h = 1 ÷ 3.6 m/s, 1 knot = 1,852 m per hour. Pace = time per unit distance = 1 ÷ speed.

Worked examples

150 miles in 2 h 30 min: Distance (not used when solving distance): 150 distance unit; Time: hours (not used when solving time): 2 h; Time: minutes: 30 min; Time: seconds: 0 s; Speed (not used when solving speed): 60 speed unit; Solve for: speed; Distance unit: mi; Speed unit: mph.
Example result: Solved value: Average speed 60 mph; Speed in mph and km/h: 60 mph · 96.5606 km/h; Speed in m/s and knots: 26.8224 m/s · 52.1386 kn; Distance: 150 mi · 241.4016 km; Time: 2:30:00 (2.5 h); Pace: 1:00 per mi · 0:37 per km.

10 km at 12 km/h: Distance (not used when solving distance): 10 distance unit; Time: hours (not used when solving time): 2 h; Time: minutes: 30 min; Time: seconds: 0 s; Speed (not used when solving speed): 12 speed unit; Solve for: time; Distance unit: km; Speed unit: kmh.
Example result: Solved value: Time 0:50:00 (0.8333 h); Speed in mph and km/h: 7.4565 mph · 12 km/h; Speed in m/s and knots: 3.3333 m/s · 6.4795 kn; Distance: 6.2137 mi · 10 km; Time: 0:50:00 (0.8333 h); Pace: 8:03 per mi · 5:00 per km.

Limitations and common mistakes

Average speed over the whole trip only: the distance traveled divided by the elapsed time, not instantaneous speed, velocity direction or acceleration. Stops are included if they are in the time you enter. Times and paces in h:mm:ss are rounded to the nearest second; other values round half-up to four decimals.

Typing 2.30 hours for 2 hours 30 minutes; 2.30 h is 2 h 18 min. Put 2 in hours and 30 in minutes.

Sources and assumptions

Method SPEED-DISTANCE-TIME-1.0; last formula review 2026-11-04. Sources and their supported claims. Calculation methodology.