How to Use the Speed Distance Time Calculator
Select what you want to calculate (speed, distance, or time), enter the other two values, and the result appears instantly. Speed is also shown in m/s; time is shown in both decimal hours and h:m:s format.
Core Formulas
- Distance = Speed × Time
- Speed = Distance ÷ Time
- Time = Distance ÷ Speed
- Unit conversion: 1 km/h = 1/3.6 m/s ≈ 0.2778 m/s
Frequently Asked Questions
How do I convert km/h to m/s?
Divide km/h by 3.6. Example: 108 km/h ÷ 3.6 = 30 m/s. Multiply m/s by 3.6 to convert back.
How long does it take to travel 120 km at 80 km/h?
Time = 120 ÷ 80 = 1.5 hours = 1h 30m. Select "Time" and enter distance=120, speed=80.
What is average vs. instantaneous speed?
This calculator computes average speed (total distance ÷ total time). A speedometer reads instantaneous speed — the speed at a specific moment in time.