Speed Distance Time Calculator
Solve for speed, distance, or time when you know the other two values. Supports miles, kilometers, meters, and multiple time formats.
About This Calculator
The Speed Distance Time Calculator solves the classic physics equation d = s x t. Enter any two of the three variables (speed, distance, time) and the calculator instantly finds the third. It supports miles, kilometers, and meters for distance, mph, km/h, and m/s for speed, and hours-and-minutes for time. It is useful for trip planning, running pace estimation, or any situation where you need to relate speed, distance, and time.
How to Use
- Enter your values in the input fields above
- Click the calculate button to see results
- Review your results displayed below the inputs
- Use the reset button to clear all fields and start over
The Formula
How the calculation works under the hood
Speed formula
How fast you are going, given distance covered and time elapsed.
Distance formula
How far you travel at a given speed over a given time.
Time formula
How long it takes to cover a distance at a given speed.
Worked Example
Step-by-step walkthrough with real numbers
“A road trip covers 280 miles in 4 hours and 30 minutes.”
- 1Distance = 280 miles.
- 2Time = 4h 30m = 4.5 hours.
- 3Speed = 280 / 4.5 = 62.22 mph.
Average speed is 62.22 mph.
⚠️Common Mistakes
- ✕Entering time in minutes instead of converting to hours (or fractions of an hour) before dividing.
- ✕Mixing units — e.g., distance in kilometers but speed in mph.
- ✕Forgetting that "average speed" over a trip does not equal the speed you drove the entire time.
💡Pro Tips
- ✓For running pace: divide 60 by your speed in mph to get minutes per mile.
- ✓To estimate road trip time, use a realistic average speed (55-65 mph) that accounts for stops and traffic.
- ✓The calculator handles conversions between mph, km/h, and m/s so you can use whichever units are convenient.
Frequently Asked Questions
What is the speed formula?
Speed = Distance / Time. If you know any two of these three values, you can calculate the third.
How do I convert between mph and km/h?
Multiply mph by 1.60934 to get km/h. Multiply km/h by 0.621371 to get mph.
Can I enter time in hours and minutes?
Yes. Enter hours and minutes separately and the calculator combines them automatically for the calculation.
What units are supported?
Speed: mph, km/h, m/s. Distance: miles, kilometers, meters. Time: hours and minutes.
How do I calculate travel time for a road trip?
Enter the total distance and your expected average speed. The calculator returns the travel time in hours and minutes.
Is this calculator free to use?
Yes! All calculators on Get Precision Calculator are completely free with no limitations or sign-up required.
Is my data saved or tracked?
No. All calculations are performed locally in your web browser. Get Precision Calculator does not store, collect, or track your calculation data.
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