Speed · Distance · Time Calculator
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Speed, Distance and Time – The Fundamental Motion Formula
The relationship between speed, distance and time is one of the most fundamental equations in physics and everyday life: Distance = Speed × Time. Rearranged, it gives Speed = Distance ÷ Time, and Time = Distance ÷ Speed.
Real-World Applications
- Road trips – Estimate arrival time given your average speed and distance.
- Running and cycling – Calculate average pace from a timed distance.
- Aviation – Flight planning using ground speed and route distance.
- Physics problems – Kinematics problems in school and university exams.
Unit Conversions Used
- 1 km/h = 0.27778 m/s = 0.62137 mph
- 1 mph = 1.60934 km/h = 0.44704 m/s
- 1 Knot = 1.852 km/h = 1.15078 mph
Frequently Asked Questions
What is average speed?
Average speed is total distance divided by total time. It differs from instantaneous speed (the speed at any given moment) and is used for journey planning and performance analysis.
How do I calculate travel time?
Divide the total distance by your average speed. For example, 300 km at 60 km/h = 300 ÷ 60 = 5 hours.
What is the difference between speed and velocity?
Speed is a scalar quantity (magnitude only). Velocity is a vector — it has both magnitude and direction. For most everyday calculations, speed is sufficient.
Can I use this for running pace calculations?
Yes. Enter your distance in km or miles and your finish time to calculate average speed. Or enter speed and distance to find your expected finish time.