Speed / Distance / Time
Solve D = R × T — enter any two values to find the third
About this calculator
The Speed Distance Time Calculator solves for any one of the three variables when you know the other two. Whether you're planning a road trip, analyzing an athletic performance, or working through a physics problem, just enter the values you have and choose what to solve for. Supports mph, km/h, m/s, knots, and more.
How to use the Speed / Distance / Time calculator
- Enter your values into the input fields.
- Read the result — it updates instantly as you type.
- Adjust the inputs to compare scenarios.
- Copy the page URL to share the exact calculation.
Common examples
- Speed 60 mph × Time 2.5 h → Distance = 150 miles
- Distance 400 km ÷ Speed 100 km/h → Time = 4 hours
- Distance 100 m ÷ Time 9.58 s → Speed ≈ 10.44 m/s (world record sprint)
- Speed 25 knots × Time 8 h → Distance = 200 nautical miles
- Distance 26.2 miles ÷ Time 3 h 30 min → Speed ≈ 7.49 mph (marathon pace)
Frequently asked questions
How does the Speed / Distance / Time calculator work?
Enter your numbers and the calculator applies the standard formula for this everyday task, showing the result and how it was reached. It handles the unit and rounding details so you do not have to.
When would I use the Speed / Distance / Time calculator?
Whenever this comes up in daily life — planning, shopping, home projects, travel or work — and you want a quick, dependable answer instead of estimating or working it out by hand.
How accurate are the results?
The math runs at full precision internally and only the displayed value is rounded for readability. For real-world use the practical limit is the accuracy of the numbers you enter, not the calculation.
Can I share a specific calculation with someone else?
Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.