Quick Answer
Speed-Distance-Time triangle: Speed = Distance ÷ Time · Distance = Speed × Time · Time = Distance ÷ Speed. Enter any two values and the calculator solves for the third.
What Is a Speed & Distance?
Speed, distance, and time are locked in a simple triangular relationship — know any two, calculate the third. This comes up constantly: how long will a road trip take, how far does a train travel in a set time, what average speed did a runner maintain.
Speed is measured in km/h, distance in kilometres, and time in decimal hours. Time must be in decimal hours — 90 minutes = 1.5 hours. The calculator removes friction by letting you declare which value to solve for.
How to Use This Speed & Distance
- 1Select what you want to calculate: Speed, Distance, or Time.
- 2Enter the two known values.
- 3The result updates instantly.
The Formula Explained
Speed
Speed = Distance ÷ TimeDistance
Distance = Speed × TimeTime
Time = Distance ÷ SpeedExample: A car travels 240 km in 3 hours — what is its average speed?
- Speed = 240 ÷ 3
Average speed = 80 km/h
Tips & Things to Know
- This gives AVERAGE speed — real-world travel has stops and traffic.
- Time must be decimal hours: 90 minutes = 1.5 hours. Divide minutes by 60.
- Convert km/h to m/s: divide by 3.6. Convert mph to km/h: multiply by 1.60934.