Everyday & School Calculators
Speed, Distance & Time Calculator
Choose which of speed, distance and time you want, enter the other two, and get the answer with the formula used. Keep the units consistent.
Try an example:
AnswerSpeed = 50
- Units: distance unit per time unit
Step-by-step working 1 steps
- 1speed = distance ÷ time
150 ÷ 3 = 50
How to use the speed, distance & time calculator
- Pick the quantity to find.
- Enter the two known values using consistent units.
- Read the answer and formula.
- Convert units afterwards if you need to.
The triangle
speed = distance ÷ time distance = speed × time time = distance ÷ speed
If speed is km/h, time must be in hours and distance in km.
Worked examples
Each example below is generated by the same calculator you used above, so the working always matches the answer.
150 km in 3 h
AnswerSpeed = 50
- Units: distance unit per time unit
Step-by-step working 1 steps
- 1speed = distance ÷ time
150 ÷ 3 = 50
60 km/h for 2.5 h
AnswerDistance = 150
Step-by-step working 1 steps
- 1distance = speed × time
60 × 2.5 = 150
90 km at 60 km/h
AnswerTime = 1.5
- If hours: 1 h 30 min
Step-by-step working 2 steps
- 1time = distance ÷ speed
90 ÷ 60 = 1.5
- 2If the time unit is hours
1.5 h = 1 h 30 min
Common mistakes to avoid
Mixing minutes with hours
Convert 30 minutes to 0.5 hours before using km/h.
Using the wrong formula
Cover the quantity you want in the triangle; what remains is the formula.
Averaging speeds for a round trip
Average speed is total distance ÷ total time, not the mean of two speeds.
Frequently asked questions
How do I convert km/h to m/s?
Divide by 3.6.
What is average speed?
Total distance divided by total time taken.