Speed Converter
Type a speed or a running pace into any box and every other unit updates instantly. See how long a mile, a 10K or a marathon takes at that speed, and compare it with walking, highway and sound speeds.
Last updated:
Common speed reference table (click a row to load it)
| Example | km/h | mph | m/s | knots |
|---|---|---|---|---|
| Walking (typical adult) | ≈5 | ≈3.1 | ≈1.39 | ≈2.7 |
| Jogging (easy pace) | ≈10 | ≈6.2 | ≈2.78 | ≈5.4 |
| 100 m world record average (9.58 s) | 37.6 | 23.4 | 10.44 | 20.3 |
| Cycling commute | ≈20 | ≈12.4 | ≈5.56 | ≈10.8 |
| City street limit (US, common) | 40.2 | 25 | 11.18 | 21.7 |
| Interstate highway limit (US, common) | 104.6 | 65 | 29.06 | 56.5 |
| Hurricane force (Category 1 starts) | 119.1 | 74 | 33.08 | 64.3 |
| High-speed train (operating top speed) | ≈320 | ≈198.8 | ≈88.89 | ≈172.8 |
| Airliner cruise | ≈900 | ≈559.2 | ≈250 | ≈486 |
| Speed of sound (sea level, 15 °C) | 1,225 | 761.2 | 340.29 | 661.5 |
| Earth orbiting the Sun | ≈107,208 | ≈66,616 | ≈29,780 | ≈57,887.7 |
≈ marks typical or approximate values; speed limits vary by state and road.
Formula with your numbers
Speed conversion table
| From | To |
|---|
20 rows. Click a row to load it into the converter.
How to use the Speed Converter
- Type a speed in any unit, such as 65 in Miles per hour, or a pace like 5:30 in Pace per kilometer.
- Read the results: all units update together and the headline shows the usual pair (km/h ⇄ mph).
- See race times in the side panel: how long 5 km, 10 km or a marathon takes at that speed.
- Click a reference row such as highway or speed of sound to load it.
- Download a table of any two units with your own start and step.
Speed and pace formulas
All speed units here are fixed multiples of meters per second, so the converter computes result = value × (m/s per source unit) ÷ (m/s per target unit):
| Unit | In m/s | In km/h | In mph |
|---|---|---|---|
| 1 m/s | 1 | 3.6 | 2.23694 |
| 1 km/h | 0.277778 | 1 | 0.621371 |
| 1 mph | 0.44704 (exact) | 1.609344 (exact) | 1 |
| 1 ft/s | 0.3048 (exact) | 1.09728 | 0.681818 |
| 1 knot | 0.514444 | 1.852 (exact) | 1.15078 |
| Mach 1 (sea level, 15 °C) | 340.29 | 1,225.04 | 761.21 |
Pace works the other way round: it is time per distance. Pace in minutes = 60 ÷ speed, using km/h for min/km and mph for min/mile. Because it is an inverse, doubling your speed halves your pace.
Running pace to speed chart
| Pace per km | Pace per mile | km/h | mph | Marathon time |
|---|---|---|---|---|
| 4:00 | 6:26 | 15.0 | 9.32 | 2:48:47 |
| 4:30 | 7:15 | 13.3 | 8.28 | 3:09:53 |
| 5:00 | 8:03 | 12.0 | 7.46 | 3:30:59 |
| 5:30 | 8:51 | 10.9 | 6.78 | 3:52:04 |
| 6:00 | 9:39 | 10.0 | 6.21 | 4:13:10 |
| 7:00 | 11:16 | 8.6 | 5.33 | 4:55:22 |
Tips
- Quick mph ↔ km/h: multiply mph by 1.6 for a close km/h figure (50 mph ≈ 80 km/h).
- Treadmills: US machines usually show mph; use the pace boxes to match a race target.
- Wind and weather: forecasts may use knots, km/h, mph or m/s; 10 m/s is 36 km/h, 22.4 mph or 19.4 knots.
Frequently asked questions
How do I convert mph to km/h?
Multiply by 1.609344, because one mile is exactly 1.609344 km. For example, 60 mph = 96.56 km/h. To go from km/h to mph, divide by 1.609344 (or multiply by 0.621371).
How do I convert km/h to m/s?
Divide by 3.6, since 1 km/h = 1,000 m ÷ 3,600 s. For example, 90 km/h = 25 m/s. Multiply m/s by 3.6 to get km/h.
What is a knot?
One knot is one nautical mile per hour: exactly 1.852 km/h, or about 1.15078 mph. Ships, aircraft and weather reports use knots.
How fast is Mach 1?
Mach 1 is the speed of sound, which depends on air temperature. In standard sea-level air (15 °C) it is 340.29 m/s, 1,225 km/h or 761.2 mph, the value this converter uses. At airliner cruise altitude it is about 295 m/s.
How do I convert pace to speed?
Divide 60 by the pace in minutes. A 6:00 min/km pace is 60 ÷ 6 = 10 km/h; an 8:00 min/mile pace is 7.5 mph. Pace boxes accept m:ss values like 7:45.
How do I convert min/mile to min/km?
Divide the pace by 1.609344. A 9:00 min/mile pace (9 minutes) is 5.592 min, or 5:36 per km.
Why is there no pace for a speed of zero?
Pace is time per distance, the inverse of speed. At zero speed you never cover the distance, so the pace is infinite and the box is left blank.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.