Speed Conversion Chart: mph to km/h, m/s, Knots & More
A complete reference for converting between speed units. This guide covers miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), knots, feet per second (ft/s), and Mach — with conversion formulas, factors, and practical tables.
This guide uses exact conversion factors where applicable: international mile = 1,609.344 m, international foot = 0.3048 m, international nautical mile = 1,852 m. Real-world references (e.g., speed of sound, vehicle speeds) are approximate and labeled accordingly. Last reviewed: March 2026.
MPH ↔ km/h (KPH)
Miles per hour and kilometers per hour are the two most common speed units worldwide. MPH is used mainly in the United States and United Kingdom for road speeds, while km/h is used in most other countries. Use our MPH to km/h converter or km/h to MPH converter for instant results.
- 1 mph = 1.60934 km/h
- 1 km/h = 0.621371 mph
km/h = mph × 1.60934
mph = km/h × 0.621371
MPH to km/h Conversion Table
| MPH | km/h | Context |
|---|---|---|
| 5 mph | 8.05 km/h | Walking pace |
| 10 mph | 16.09 km/h | Jogging |
| 20 mph | 32.19 km/h | Residential speed limit |
| 30 mph | 48.28 km/h | Common urban limit (UK) |
| 40 mph | 64.37 km/h | Suburban road |
| 50 mph | 80.47 km/h | Single carriageway (UK example) |
| 55 mph | 88.51 km/h | US rural highway |
| 60 mph | 96.56 km/h | US highway |
| 65 mph | 104.61 km/h | US interstate |
| 70 mph | 112.65 km/h | UK motorway limit |
| 75 mph | 120.70 km/h | US interstate (some states) |
| 80 mph | 128.75 km/h | US high-speed limit (TX) |
| 100 mph | 160.93 km/h | High performance |
| 120 mph | 193.12 km/h | German Autobahn advisory |
| 150 mph | 241.40 km/h | Sports car |
| 200 mph | 321.87 km/h | Supercar / racing |
km/h to MPH Conversion Table
| km/h | MPH | Context |
|---|---|---|
| 30 km/h | 18.64 mph | Urban zone (Europe) |
| 50 km/h | 31.07 mph | City speed limit (Europe) |
| 80 km/h | 49.71 mph | Rural road (Europe) |
| 100 km/h | 62.14 mph | Highway (most countries) |
| 120 km/h | 74.56 mph | Motorway (Europe) |
| 130 km/h | 80.78 mph | Motorway (France, Italy) |
| 160 km/h | 99.42 mph | High-speed road |
| 200 km/h | 124.27 mph | Sports car |
| 250 km/h | 155.34 mph | Electronic speed limiter |
| 300 km/h | 186.41 mph | High-speed train / supercar |
Quick estimation trick: To roughly convert km/h to mph, multiply by 0.6. To convert mph to km/h, multiply by 1.6. These approximations are within 1% of the exact values.
Common Speed Conversions
A cross-unit reference for frequently searched speed values. Unlike the unit-pair tables above, this table shows each value in all five units at once:
Popular Speed Values in Multiple Units
| MPH | km/h | m/s | Knots | ft/s |
|---|---|---|---|---|
| 1 | 1.609 | 0.447 | 0.869 | 1.467 |
| 5 | 8.047 | 2.235 | 4.344 | 7.333 |
| 10 | 16.093 | 4.470 | 8.689 | 14.667 |
| 20 | 32.187 | 8.941 | 17.378 | 29.333 |
| 30 | 48.280 | 13.411 | 26.067 | 44.000 |
| 40 | 64.374 | 17.882 | 34.756 | 58.667 |
| 50 | 80.467 | 22.352 | 43.445 | 73.333 |
| 60 | 96.561 | 26.822 | 52.134 | 88.000 |
| 70 | 112.654 | 31.293 | 60.823 | 102.667 |
| 80 | 128.748 | 35.763 | 69.512 | 117.333 |
| 90 | 144.841 | 40.234 | 78.201 | 132.000 |
| 100 | 160.934 | 44.704 | 86.890 | 146.667 |
| 120 | 193.121 | 53.645 | 104.268 | 176.000 |
| 150 | 241.402 | 67.056 | 130.335 | 220.000 |
| 200 | 321.869 | 89.408 | 173.780 | 293.333 |
| 300 | 482.803 | 134.112 | 260.670 | 440.000 |
MPH ↔ Meters per Second (m/s)
Meters per second is the SI (International System) unit of speed, widely used in science and engineering. Convert with our MPH to m/s converter or m/s to MPH converter.
- 1 mph = 0.44704 m/s
- 1 m/s = 2.23694 mph
m/s = mph × 0.44704
mph = m/s × 2.23694
M/S to MPH Conversion Table
| m/s | MPH | km/h |
|---|---|---|
| 1 | 2.237 | 3.600 |
| 5 | 11.185 | 18.000 |
| 10 | 22.369 | 36.000 |
| 15 | 33.554 | 54.000 |
| 20 | 44.739 | 72.000 |
| 25 | 55.923 | 90.000 |
| 30 | 67.108 | 108.000 |
| 50 | 111.847 | 180.000 |
| 100 | 223.694 | 360.000 |
To convert km/h to m/s, divide by 3.6. To convert m/s to km/h, multiply by 3.6. This is because there are 3,600 seconds in an hour and 1,000 meters in a kilometer (3600 ÷ 1000 = 3.6).
Knots ↔ MPH
A knot is one nautical mile per hour. It is the standard speed unit in aviation and maritime navigation. One nautical mile equals 1.852 km (or 1.15078 statute miles). Use our knots to MPH converter or MPH to knots converter.
- 1 knot = 1.15078 mph
- 1 mph = 0.868976 knots
mph = knots × 1.15078
knots = mph × 0.868976
Knots to MPH Conversion Table
| Knots | MPH | Context |
|---|---|---|
| 5 kt | 5.75 mph | Light breeze |
| 10 kt | 11.51 mph | Gentle breeze |
| 20 kt | 23.02 mph | Fresh breeze |
| 30 kt | 34.52 mph | Strong breeze |
| 50 kt | 57.54 mph | Storm force wind |
| 100 kt | 115.08 mph | Major hurricane (Category 3) |
| 150 kt | 172.62 mph | Fast general aviation aircraft |
| 250 kt | 287.70 mph | Typical turboprop / regional aircraft |
| 450 kt | 517.85 mph | Commercial jet cruise |
| 661 kt | 760.67 mph | Speed of sound (approx., sea level) |
Knots ↔ km/h
- 1 knot = 1.852 km/h (exact) — convert knots to km/h
- 1 km/h = 0.539957 knots — convert km/h to knots
km/h = knots × 1.852
knots = km/h ÷ 1.852
Knots to km/h Conversion Table
| Knots | km/h | m/s |
|---|---|---|
| 1 | 1.852 | 0.514 |
| 5 | 9.260 | 2.572 |
| 10 | 18.520 | 5.144 |
| 20 | 37.040 | 10.289 |
| 50 | 92.600 | 25.722 |
| 100 | 185.200 | 51.444 |
| 200 | 370.400 | 102.889 |
| 500 | 926.000 | 257.222 |
The conversion factor 1.852 is exact by definition — one nautical mile was defined as exactly 1,852 meters in 1929 (International Hydrographic Conference).
Feet per Second (ft/s)
Feet per second is used in some US engineering applications, ballistics, and sports (e.g., baseball pitch speed). Use our ft/s to MPH converter or m/s to km/h converter.
- 1 ft/s = 0.681818 mph
- 1 mph = 1.46667 ft/s
- 1 ft/s = 0.3048 m/s (exact)
mph = ft/s × 0.681818
ft/s = mph × 1.46667
Feet per Second to MPH and km/h
| ft/s | MPH | km/h | m/s |
|---|---|---|---|
| 10 | 6.82 | 10.97 | 3.048 |
| 50 | 34.09 | 54.86 | 15.240 |
| 88 | 60.00 | 96.56 | 26.822 |
| 100 | 68.18 | 109.73 | 30.480 |
| 130 | 88.64 | 142.65 | 39.624 |
| 150 | 102.27 | 164.59 | 45.720 |
| 1125 | 767.05 | 1234.44 | 342.900 |
Useful fact: 88 ft/s equals exactly 60 mph. This ratio (88:60 or 22:15) is handy for quick mental conversions.
All Speed Conversion Formulas
A complete reference of multiply-by factors between all six common speed units. Use this table to convert any unit pair not covered individually above:
Speed Unit Conversion Factors
| From → To | Multiply by | Formula |
|---|---|---|
| mph → km/h | 1.60934 | km/h = mph × 1.60934 |
| km/h → mph | 0.621371 | mph = km/h × 0.621371 |
| mph → m/s | 0.44704 | m/s = mph × 0.44704 |
| m/s → mph | 2.23694 | mph = m/s × 2.23694 |
| mph → knots | 0.868976 | knots = mph × 0.868976 |
| knots → mph | 1.15078 | mph = knots × 1.15078 |
| mph → ft/s | 1.46667 | ft/s = mph × 1.46667 |
| ft/s → mph | 0.681818 | mph = ft/s × 0.681818 |
| km/h → m/s | 0.277778 | m/s = km/h ÷ 3.6 |
| m/s → km/h | 3.6 | km/h = m/s × 3.6 |
| knots → km/h | 1.852 | km/h = knots × 1.852 |
| km/h → knots | 0.539957 | knots = km/h ÷ 1.852 |
| knots → m/s | 0.514444 | m/s = knots × 0.514444 |
| ft/s → m/s | 0.3048 | m/s = ft/s × 0.3048 |
Master Speed Conversion Chart
Real-world speed benchmarks converted across all units. Use this chart to put conversion values into everyday context:
Real-World Speeds in All Units
| Reference | mph | km/h | m/s | knots |
|---|---|---|---|---|
| Walking | 3.1 | 5.0 | 1.4 | 2.7 |
| Jogging | 6.2 | 10.0 | 2.8 | 5.4 |
| Usain Bolt (peak) | 27.3 | 44.0 | 12.2 | 23.8 |
| City driving (50 km/h) | 31.1 | 50.0 | 13.9 | 27.0 |
| US highway (65 mph) | 65.0 | 104.6 | 29.1 | 56.5 |
| EU motorway (130 km/h) | 80.8 | 130.0 | 36.1 | 70.2 |
| Category 1 hurricane | 74.0 | 119.1 | 33.1 | 64.3 |
| High-speed rail (~320 km/h) | 199.0 | 320.0 | 88.9 | 172.8 |
| Commercial jet cruise | 575.0 | 925.0 | 257.0 | 500.0 |
| Speed of sound (approx., sea level, 15 °C) | 761 | 1,225 | 340 | 661 |
| Concorde cruise | 1,354.0 | 2,180.0 | 605.0 | 1,177.0 |
Frequently Asked Questions
How do you convert mph to km/h?
Multiply the speed in mph by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h. For a quick estimate, multiply by 1.6.
How do you convert km/h to mph?
Multiply the speed in km/h by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph. For a quick estimate, multiply by 0.6.
How many km/h is 100 mph?
100 mph = 160.93 km/h.
How many mph is 100 km/h?
100 km/h = 62.14 mph. This is the standard highway speed limit in many countries.
What is a knot in mph?
One knot equals approximately 1.15078 mph. A knot is one nautical mile per hour. It is the standard unit for air and sea navigation because nautical miles relate directly to degrees of latitude.
How do you convert m/s to mph?
Multiply the speed in m/s by 2.23694. For example, 10 m/s × 2.23694 = 22.37 mph.
How fast is 300 km/h in mph?
300 km/h = 186.41 mph. This is in the range of modern high-speed rail services and many supercars.
What is the difference between mph and kph?
MPH (miles per hour) is used mainly in the US and UK for road speeds. km/h (kilometers per hour), sometimes written KPH, is used in most of the world. Since 1 mile = 1.609 km, km/h values are always about 60% larger than mph for the same actual speed.
How do you convert feet per second to mph?
Multiply feet per second by 0.681818 to get mph. A useful shortcut: 88 ft/s = exactly 60 mph.
What is Mach 1 in mph?
At sea level and 15°C, Mach 1 (the speed of sound) is approximately 761 mph (1,225 km/h or 661 knots). At typical cruise altitudes and colder temperatures, Mach 1 is lower, around 660 mph.
Sources & Methodology
Conversion factors in this guide follow internationally accepted unit definitions. The international mile, foot, and yard are defined by the 1959 International Yard and Pound Agreement. The nautical mile (1,852 m) follows the 1929 International Hydrographic Conference standard. The speed of sound reference (approximately 340 m/s at sea level, 15 °C) is based on standard atmosphere conditions. Meteorological classifications (e.g., hurricane categories) follow NOAA’s Saffir–Simpson Hurricane Wind Scale.
Related Resources
- Speed Converter — Interactive converter for all speed units
- MPH to km/h Converter
- km/h to MPH Converter
- Knots to MPH Converter
- M/S to MPH Converter
- Distance, Speed & Time Calculator — Calculate any variable from the other two
- Length & Distance Converter — Convert km, miles, meters, feet, yards