Calculators
Speed Calculator
Solve for speed, distance, or time.
Free account14-day Pro trialWorks in your browser
Sign in to use this tool
Create a free account to unlock every tool — plus a 14-day free trial of HQ Pro, no card required.
About the Speed Calculator
Speed, distance, and time are linked by speed = distance ÷ time. Pick which one to solve for, enter the other two in the units you have (miles/km/meters, hours/minutes/seconds), and get the answer — with speed shown in mph, km/h, and m/s. It's ideal for trips, running, driving, and physics homework.
How to use the Speed Calculator
- 01Enter your any two of speed, distance, and time (with units).
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
How do I calculate speed?
Divide distance by time: speed = distance ÷ time. Choose 'Speed' and enter the distance and time — the tool gives the answer in mph, km/h, and m/s.
Can it find distance or time instead?
Yes — pick 'Distance' (from speed × time) or 'Time' (from distance ÷ speed) and fill the other two fields.