Speed, Distance & Time Calculator
Free speed distance time calculator. Enter any two values to solve for the third. Supports mph, km/h, m/s, and more.
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Speed, Distance & Time
Enter any 2 values. Leave the unknown field empty.
Comprehensive Guide & Practice
Master the mathematical principles, formulas, and step-by-step methods with worked examples and FAQs.
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1. The Speed, Distance and Time Formula Triangle
The relationship between speed, distance, and time is one of the most important formulas in physics and everyday life:
- Speed = Distance ÷ Time
- Distance = Speed × Time
- Time = Distance ÷ Speed
A useful memory trick: draw a triangle with D on top, and S and T at the bottom corners. Cover the variable you want to find — the remaining two show the formula.
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2. Real-World Examples
- A car travels 120 miles in 2 hours. Speed = 120 ÷ 2 = 60 mph.
- A runner at 8 km/h for 45 minutes. Distance = 8 × (45/60) = 6 km.
- A plane at 500 mph must travel 2,500 miles. Time = 2500 ÷ 500 = 5 hours.
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3. Unit Conversions
Always ensure speed and distance units match before calculating time. 1 hour = 60 minutes = 3600 seconds. 1 km ≈ 0.621 miles. 1 mile ≈ 1.609 km.
See also: Unit Converter | Percentage Change