What is the Speed, Distance & Time Calculator?
This calculator solves the classic motion relationship between speed, distance, and time. Given any two of the three quantities, it instantly computes the third. It is useful for trip planning, running and cycling pace estimates, physics homework, and logistics. The tool accepts mixed units — kilometers, miles, or meters for distance, and hours, minutes, or seconds for time — and normalizes everything to kilometers and hours internally.
How to use it
Choose what you want to solve for: Speed, Distance, or Time. Then enter the two known values and pick their units. For example, to find your average speed, enter the distance traveled and the time taken, then read the result in km/h. The calculator outputs distance in kilometers, time in hours, and speed in kilometers per hour.
The formula explained
The three relationships all stem from one equation: $$\text{distance} = \text{speed} \times \text{time}$$ Rearranging gives \(\text{speed} = \text{distance} \div \text{time}\) and \(\text{time} = \text{distance} \div \text{speed}\). Consistent units are essential — that is why this tool converts your inputs to a common base (kilometers and hours) before computing.
Worked example
Suppose you drive 150 km in 2 hours. $$\text{Speed} = 150 \div 2 = 75\ \text{km/h}$$ Now suppose you travel at 60 km/h for 30 minutes (0.5 h): $$\text{distance} = 60 \times 0.5 = 30\ \text{km}$$ To cover 100 km at 50 km/h, $$\text{time} = 100 \div 50 = 2\ \text{hours}$$
FAQ
Does it handle miles? Yes. Select miles as the distance unit; the result is converted to km/h using \(1\ \text{mile} = 1.609344\ \text{km}\).
What units is the answer in? Speed is shown in km/h, distance in km, and time in hours, regardless of your input units.
How do I convert hours to minutes? Multiply the hour result by 60. For example, 0.5 hours equals 30 minutes.
