Enter any two values — speed, distance, or time — and the calculator finds the third. Ideal for planning a drive, run, or trip.
Everything comes from one simple relationship:
Distance = Speed × Time
Rearrange it to solve for the other two:
You're driving a 240-mile trip at 60 mph. How long will it take?
Time = 240 ÷ 60 = 4 hours. Or if you have 3 hours and drive at 65 mph, you'll cover 65 × 3 = 195 miles.
| Distance | @ 55 mph | @ 65 mph | @ 70 mph |
|---|---|---|---|
| 50 miles | ~55 min | ~46 min | ~43 min |
| 100 miles | ~1h 49m | ~1h 32m | ~1h 26m |
| 200 miles | ~3h 38m | ~3h 5m | ~2h 51m |
| 300 miles | ~5h 27m | ~4h 37m | ~4h 17m |
| 500 miles | ~9h 5m | ~7h 42m | ~7h 9m |
| mph | km/h |
|---|---|
| 30 | 48 |
| 50 | 80 |
| 60 | 97 |
| 65 | 105 |
| 70 | 113 |
| 75 | 121 |
Convert: 1 mph ≈ 1.609 km/h. To go from mph to km/h, multiply by 1.609; to go back, divide by 1.609.
Use any consistent set of units. If distance is in miles and speed in mph, time comes out in hours. If both are metric (km and km/h), the math works the same way.
No. The result is pure driving time at constant speed. For a real road trip, add time for stops, meals, and traffic.
Speed = distance ÷ time. If you run 5 km in 30 minutes (0.5 hours), your average speed is 10 km/h, or 6 minutes per km.