Speed, Distance and Time Calculator
Calculate any one of speed, distance or travel time when you know the other two values, for trip planning and driving estimates.
Your results
Calculation breakdown
- Motion
- Distance = speed × time
Worked example
Travelling 250km leaving speed at 0 with a time of 3 hours calculates an average speed of about 83.3 km/h.
Assumptions
- Assumes constant average speed for the whole journey.
- Set the unknown value's field to zero to have it calculated.
How this calculator works
Enter any two of speed, distance and time to calculate the third, using the standard motion formula. Handy for estimating driving time on a road trip or checking your average speed on a completed journey.
Frequently asked questions
Which value should I leave blank?
Set the value you want calculated to zero and fill in the other two fields; the calculator solves for whichever is missing based on your selection.
Does this account for rest stops?
No, this calculates pure driving time at a constant average speed; add rest stop time separately using the Roadside Trip Time calculator.
What units does this use?
Distance is in kilometres, speed in kilometres per hour and time in hours, the standard Australian road units.
Editorial review and responsibility
Reviewed by the CalcAussie editorial team on 21 September 2026. Review scope: Method, Australian terminology, material assumptions, source links and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.