Speed = distance ÷ time is the version everyone memorizes. Rearranging it to solve for distance or time under time pressure — a word problem, a real trip calculation — is where people actually get it backwards.
Distance time speed calculator, pick what you need
Choose "Speed," "Distance," or "Time" from the dropdown and this calculator shows only the two fields you need to fill in, applying the correctly rearranged version of the formula automatically.
How to calculate speed, distance, or time
Driving 120 km in 2 hours averages 60 km/h (about 37 mph) — enter any two of the three values for any scenario, not just that one.
Average speed calculator, not a unit converter
This solves the actual equation rather than just converting m/s to mph — for pure unit conversion between speed units, the Unit Conversion Calculator's Speed category is the simpler tool.
