Speed = Distance / Time. This fundamental formula connects three physical quantities. Given any two, you can solve for the third: Distance = Speed × Time, Time = Distance / Speed. This calculator handles unit conversions automatically so you can mix mph with km or minutes with hours.
How to Use
Select what to solve for:
- Speed: Enter distance and time
- Distance: Enter speed and time
- Time: Enter speed and distance
The Formulas
- Speed = Distance ÷ Time
- Distance = Speed × Time
- Time = Distance ÷ Speed
Speed References
- Walking: 3-4 mph (5-6 km/h)
- Running: 6-8 mph (10-13 km/h)
- Cycling: 12-18 mph (19-29 km/h)
- Highway driving: 60-70 mph (97-113 km/h)
- Speed of sound: 767 mph (1,235 km/h)
Step-by-Step Instructions
- 1Select what to calculate (speed, distance, or time).
- 2Enter the two known values.
- 3Select appropriate units.
- 4View the calculated result.
- 5Check pace and reference speeds.