How to use the Speed Distance Time Calculator
Pick what you want to find: speed, distance or time. Enter the other two values in matching units and read the answer.
Worked examples
A 150 km trip at an average of 60 km/h takes 150 ÷ 60 = 2.5 hours, or 2 hours 30 minutes. Running 10 km in 50 minutes is an average speed of 10 ÷ (50 ÷ 60) = 12 km/h. Driving at 65 mph for 3 hours covers 195 miles.
Keep the units matched
Use kilometres with km/h or miles with mph, and enter time in hours. Convert minutes by dividing by 60, so 45 minutes is 0.75 hours. The result is an average, so stops, traffic and hills will make a real journey take longer than the plain calculation suggests.
The formula
distance = speed × time
Examples
- Time for 150 miles at 60 mph
Time = 2.5 hours (2 h 30 min)
- Speed over 240 km in 3 hours
Speed = 80 per hour
- Distance at 45 mph for 2.5 hours
Distance = 112.5
Limitations and assumptions
Use consistent units (miles with mph, km with km/h).
Frequently asked questions
What is the formula?
Distance = speed × time. Rearranged, speed = distance ÷ time and time = distance ÷ speed.
Can I mix units?
Keep them consistent: kilometres with km/h, miles with mph.
How do I enter minutes?
Convert to hours, so 30 minutes is 0.5.
Does it include stops?
No, it assumes a constant speed.