Speed, distance and time calculator
One relation, three rearrangements, and unit pickers that convert exactly before the division happens.
hours
Average speed
0.018 518 519m/s
- Same speed
- 0.0667 km/h
- Same speed
- 0.0414 mph
- Time at the given speed
- 0.000 35 hours
- Distance at the given speed
- 432 000
Show the working
- Distance = 100
- Time = 1.5
- Speed (for the reverse) = 80
- Average speed = 100 / (1.5 * 3600) = 0.018 518 5
- Time at the given speed = 80 > 0 ? 100 / 80 / 3600 : 0 = 0.000 347 222
- Distance at the given speed = 80 * 1.5 * 3600 = 432 000
- Same speed = 0.018 518 5 * 3.6 = 0.066 666 7
- Same speed = 0.018 518 5 * 3600 / 1609.344 = 0.041 424 7
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- speed = distance / time
- time = distance / speed
- distance = speed x time
Distance is entered in kilometres and time in hours by default, but every field converts exactly.