Speed Converter
Convert between mph, km/h, m/s, knots, and ft/s.
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1 mph = 1.609344 km/h
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 1 | 1.609344 |
| 2 | 3.218688 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 15 | 24.14016 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 75 | 120.7008 |
| 100 | 160.9344 |
| 150 | 241.4016 |
| 200 | 321.8688 |
| 250 | 402.336 |
| 500 | 804.672 |
| 1,000 | 1,609.344 |
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Speed Conversion Reference
| From | To |
|---|---|
| 1 mph | 1.609 km/h |
| 1 km/h | 0.621 mph |
| 1 knot | 1.151 mph / 1.852 km/h |
| 1 m/s | 2.237 mph / 3.6 km/h |
| Speed of light | 299,792 km/s |
Speed in Everyday Context
Walking speed is roughly 3 mph (5 km/h). A casual cyclist moves at about 15 mph (24 km/h). Highway driving in the US is typically 60–70 mph (97–113 km/h). The speed of sound is 767 mph (1,235 km/h) — that's Mach 1.
Runners often track their pace in minutes per mile or minutes per kilometer rather than speed. For race pacing and training calculations, use our Pace Calculator.
When to use this
You are driving in Europe and the speed limit sign says 130 — that is km/h, but how fast is that in mph? Or you are reading a weather report about wind speeds in knots and want to understand the real-world impact in miles per hour. Or a physics problem gives velocity in meters per second and you need km/h. Speed conversion comes up in driving abroad, aviation, sailing, meteorology, physics, and sports.
The most commonly searched speed conversions are mph to km/h, km/h to mph, and knots to mph. This converter handles all of these plus meters per second (the SI unit) and feet per second. The key relationships: 1 mph = 1.609 km/h, 1 knot = 1.151 mph, and 1 m/s = 3.6 km/h.
Good to know
Quick mph-to-km/h estimate: multiply by 1.6. 60 mph is about 97 km/h. 100 km/h is about 62 mph. For most driving situations, these estimates are close enough to understand speed limit signs in another country.
A knot is one nautical mile per hour. Knots are used in aviation and maritime because they tie directly to the latitude/longitude coordinate system. One knot = 1.852 km/h = 1.151 mph. When a pilot reports airspeed in knots, they are describing movement relative to the coordinate grid of the Earth.
Meters per second puts everyday speeds in perspective. Walking speed is about 1.4 m/s. A fast sprint is about 10 m/s. Highway driving at 70 mph is about 31 m/s. The speed of sound at sea level is about 343 m/s. Using m/s helps you understand the physics behind familiar experiences.
Quick Reference
| MPH | KM/H | M/S | Knots | Context |
|---|---|---|---|---|
| 3.1 | 5 | 1.4 | 2.7 | Walking |
| 12.4 | 20 | 5.6 | 10.8 | Cycling |
| 30 | 48.3 | 13.4 | 26.1 | City driving |
| 60 | 96.6 | 26.8 | 52.1 | Highway driving |
| 70 | 112.7 | 31.3 | 60.8 | US interstate limit |
| 80.8 | 130 | 36.1 | 70.2 | EU motorway limit |
| 100 | 160.9 | 44.7 | 86.9 | Fast driving |
| 767 | 1,235 | 343 | 667 | Speed of sound |