Speed Calculator
Solve for speed, distance or time with the formula speed = distance / time, and see the result in mph, km/h, m/s and knots. Example: 150 miles in 2 hours 30 minutes is 60 mph.
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How to use the Speed Calculator
- Choose whether to solve for speed, distance or time.
- Fill in the two values you know. The unused field is ignored.
- Press Calculate to see mph, km/h, m/s and knots.
Formula and method
Speed = distance / time. Distance = speed x time. Time = distance / speed. Convert minutes to hours by dividing by 60 before you divide or multiply.
Worked example: 150 miles in 2 hours 30 minutes
| Step | Value |
|---|---|
| Time in hours | 2.5 |
| Speed (150 / 2.5) | 60 mph |
| In km/h | 96.56 |
| In m/s | 26.82 |
Speed conversion chart
| mph | km/h | m/s | Knots |
|---|---|---|---|
| 10 | 16.1 | 4.5 | 8.7 |
| 25 | 40.2 | 11.2 | 21.7 |
| 30 | 48.3 | 13.4 | 26.1 |
| 45 | 72.4 | 20.1 | 39.1 |
| 55 | 88.5 | 24.6 | 47.8 |
| 65 | 104.6 | 29.1 | 56.5 |
| 75 | 120.7 | 33.5 | 65.2 |
| 100 | 160.9 | 44.7 | 86.9 |
Pace for running
Pace is time per distance. A 10 mph runner covers a mile in 6 minutes. Divide 60 by your mph to get minutes per mile.
Frequently asked questions
What is the speed formula?
Speed equals distance divided by time.
How do I find distance from speed and time?
Multiply speed by time. At 60 mph for 2.5 hours you travel 150 miles.
How do I find time from speed and distance?
Divide distance by speed. 150 miles at 60 mph takes 2.5 hours.
How do I convert mph to km/h?
Multiply by 1.609344.
How many mph is 1 m/s?
1 m/s is about 2.237 mph.
What is a knot?
One nautical mile per hour, or about 1.15 mph.
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