Solve for any one of speed, distance, or time given the other two. Choose what you want to calculate and enter the known values.
Fill in the details and
your result appears here.
Select Speed, Distance, or Time — the input fields update to ask for the other two.
Use the unit dropdowns to match your input units — km, miles, metres, hours, minutes, seconds.
Result shown in km/h, mph, m/s, and running pace simultaneously.
All three variables are related by these simple formulas. This calculator handles unit conversion automatically — enter km and hours, or miles and minutes, and results appear in all common units simultaneously.
Average speed = Total distance ÷ Total time. Select "Speed", enter total distance and total time. For a trip of 240km in 3 hours: 240 ÷ 3 = 80 km/h.
Speed = km per hour (how far in one hour). Pace = minutes per km (how long per km). Runners use pace — e.g. 5:30 min/km. 10 km/h = 6:00 min/km pace.
Multiply mph by 1.60934. So 60 mph = 96.56 km/h. This calculator does the conversion automatically.
Time = 100 ÷ 80 = 1.25 hours = 1 hour 15 minutes. Select "Time", enter 100km and 80 km/h.
Speed = Distance / Time = 120 / 1.5 = 80 km/h. This is average speed — it accounts for stops, acceleration, and deceleration throughout the journey.