Complete Speed Conversion Guide
This complete guide explains every major speed unit used globally, including kilometres per hour (km/h), metres per second (m/s), miles per hour (mph), knots, and feet per second (ft/s). Below you’ll find formulas, examples, conversion tables and real-world uses—perfect for physics, vehicles, sports, aviation and weather calculations.
Kilometre per Hour to Metre per Second (KM/H → M/S)
Metres per second is the SI standard unit for speed used in science, physics and engineering.
Formula
m/s = km/h ÷ 3.6
Example
90 km/h ÷ 3.6 = 25 m/s
| KM/H | M/S |
|---|---|
| 10 | 2.78 |
| 50 | 13.89 |
| 100 | 27.78 |
Metre per Second to Kilometre per Hour (M/S → KM/H)
Formula
km/h = m/s × 3.6
Example
20 m/s × 3.6 = 72 km/h
Kilometre per Hour to Miles per Hour (KM/H → MPH)
Miles per hour is used mainly in the US, UK and for vehicle speedometers.
Formula
mph = km/h × 0.621371
Example
100 km/h × 0.621371 = 62.14 mph
Miles per Hour to Kilometre per Hour (MPH → KM/H)
Formula
km/h = mph × 1.60934
Example
60 mph × 1.60934 = 96.56 km/h
Knots to Kilometre per Hour (Knots → KM/H)
Knots are used in aviation and marine navigation.
Formula
km/h = knots × 1.852
Example
20 knots × 1.852 = 37.04 km/h
Kilometre per Hour to Knots (KM/H → Knots)
Formula
knots = km/h ÷ 1.852
Example
60 km/h ÷ 1.852 = 32.4 knots
Miles per Hour to Metres per Second (MPH → M/S)
Formula
m/s = mph × 0.44704
Example
50 mph × 0.44704 = 22.35 m/s
Quick Speed Conversion Table
| Unit | Equivalent |
|---|---|
| 1 km/h | 0.2778 m/s • 0.621 mph • 0.54 knots |
| 1 m/s | 3.6 km/h • 2.236 mph |
| 1 mph | 1.609 km/h • 0.447 m/s |
| 1 knot | 1.852 km/h • 0.514 m/s |
Frequently Asked Questions
1. Are these speed conversions accurate?
Yes, all calculations use international standard conversion formulas.
2. Where are speed conversions used?
Cars, running, aviation, shipping, physics, meteorology and engineering.
3. Why do some results show decimal values?
Because most speed units do not convert evenly, decimals are natural and accurate.
4. Is the Speed Converter Tool mobile-friendly?
Yes, it adapts for phones, tablets, laptops and all screen sizes.
5. What is the most accurate speed unit?
Metres per second (m/s) is the SI unit used globally for scientific accuracy.
Conclusion
Speed conversions are essential in science, transportation, fitness and real-world measurements. This guide, combined with the Speed Converter Tool, helps you convert quickly and accurately between km/h, mph, m/s, knots and ft/s.
