Why use this calculator
The speed-distance-time relationship is one of the most fundamental concepts in physics and everyday life, from planning road trips to understanding athletic performance.
How to use it
Select what you want to solve for, then enter the two known values. For speed: enter distance and time. For distance: enter speed and time. For time: enter distance and speed.
The formula
Speed = Distance / Time. Distance = Speed × Time. Time = Distance / Speed.
Worked examples
100 miles in 2 hours
Speed = 50 mph
60 mph for 3.5 hours
Distance = 210 miles
When people use it
- Road trip planning
- Running pace calculations
- Physics homework
- Travel time estimation
Tips
- Ensure units are consistent (miles with hours, or km with hours)
- Average speed accounts for stops and speed changes
Questions people ask
- How do I convert mph to km/h?
- Multiply mph by 1.60934. For example, 60 mph = 96.56 km/h.