Speed / Distance / Time
Solve D = R × T — enter any two values to find the third
About this calculator
The Speed Distance Time Calculator solves for any one of the three variables when you know the other two. Whether you're planning a road trip, analyzing an athletic performance, or working through a physics problem, just enter the values you have and choose what to solve for. Supports mph, km/h, m/s, knots, and more.
Common examples
- Speed 60 mph × Time 2.5 h → Distance = 150 miles
- Distance 400 km ÷ Speed 100 km/h → Time = 4 hours
- Distance 100 m ÷ Time 9.58 s → Speed ≈ 10.44 m/s (world record sprint)
- Speed 25 knots × Time 8 h → Distance = 200 nautical miles
- Distance 26.2 miles ÷ Time 3 h 30 min → Speed ≈ 7.49 mph (marathon pace)