Speed Converter
Use this free Speed Converter to calculate your Convert speed units instantly and accurately.
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Result
What is a Speed Converter?
A Speed Converter is a free online tool that converts speed measurements between kilometres per hour, miles per hour, metres per second, feet per second, and knots. It is essential for travel, sports, automotive comparisons, and aviation.
How to calculate speed conversion manually (the formula)
Speed conversion uses fixed conversion factors. To convert km/h to mph, divide by 1.60934. To convert mph to km/h, multiply by 1.60934. To convert m/s to km/h, multiply by 3.6. To convert knots to mph, multiply by 1.15078.
Example calculation
Convert 100 km/h to mph: 100 ÷ 1.60934 = 62.14 mph. Convert 60 mph to km/h: 60 × 1.60934 = 96.56 km/h. Convert 20 m/s to km/h: 20 × 3.6 = 72 km/h.
Common mistakes
- Confusing mph and knots — A knot is not the same as mph. One knot equals 1.15078 mph. Using them interchangeably gives significant errors.
- Using the wrong conversion direction — Dividing instead of multiplying (or vice versa) is a common error. Always verify whether the target unit is larger or smaller.
- Mixing up m/s with km/h — A speed of 10 m/s equals 36 km/h. Forgetting the factor of 3.6 leads to large discrepancies.
Frequently asked questions
What is a Speed Converter?
A Speed Converter is a tool that converts speed measurements between units such as kilometres per hour, miles per hour, metres per second, feet per second, and knots.
How do I convert km/h to mph?
To convert km/h to mph, divide the speed in km/h by 1.60934. For example, 100 km/h ÷ 1.60934 = 62.1371 mph.
What is the formula for converting mph to km/h?
To convert mph to km/h, multiply the speed in mph by 1.60934. For example, 60 mph × 1.60934 = 96.5604 km/h.
How many knots are in one mph?
One mph is approximately 0.868976 knots. To convert mph to knots, divide by 1.15078.
What is the difference between metres per second and km/h?
To convert m/s to km/h, multiply by 3.6. For example, 10 m/s × 3.6 = 36 km/h. To convert km/h to m/s, divide by 3.6.