Speed Converter
Convert between mph, km/h, m/s, knots, and ft/s.
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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Helpful answers
Frequently asked questions
- What speed units can I convert between?
- Meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, and feet per second (ft/s). These cover automotive, aviation, marine, and scientific use cases.
- What are common speed conversions?
- 1 mph = 1.609 km/h, 1 km/h = 0.621 mph, 1 knot = 1.151 mph = 1.852 km/h, 1 m/s = 3.6 km/h = 2.237 mph.
- What is a knot?
- A knot is one nautical mile per hour (1.852 km/h). It is the standard unit for maritime and aviation speed. The name comes from the historical practice of measuring ship speed by counting knots in a rope.
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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.
Feet per second is common in engineering. One foot per second equals exactly 0.3048 m/s, or about 1.09728 km/h and 0.681818 mph. It is useful for projectile motion, flow rates, and US engineering specifications.
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 |
| 0.682 | 1.097 | 0.3048 | 0.593 | 1 foot per second |