Average speed equals the total distance divided by the total time, speed = distance ÷ time. So 100 kilometres covered in 2 hours is 50 km/h. In AnyTool Speed Distance Time Calculator you choose “Speed”, enter the distance and the time in whatever units you like, and it converts them to metres and seconds, divides, and shows the answer in km/h, mph, m/s, knots and ft/s at once — all computed in your browser.

Pace is the inverse of speed. Minutes per kilometre equals 60 divided by the speed in km/h, and minutes per mile equals 60 divided by the speed in mph. At 12 km/h that is a 5:00 min/km pace. AnyTool Speed Distance Time Calculator shows this pace panel automatically for any speed you calculate or enter, in minutes-and-seconds format for both kilometres and miles — useful for runners and cyclists.

You can mix units freely — miles with hours, kilometres with minutes, metres with seconds — because the engine converts each value to SI base units (metres and seconds) before applying distance = speed × time, then converts the answer back to the unit you chose. This removes the most common source of error in speed problems, which is forgetting to put distance and time in matching units.

The formula distance = speed × time describes motion at a single constant speed, so the result is the average speed over the entire trip. Real journeys vary with traffic, hills, stops and wind, so your instantaneous speed will be higher and lower at different moments. The calculator states this honestly and flags division by zero (zero time or zero speed) instead of returning infinity. Everything runs in your browser with no upload.