Speed Converter
Convert between common speed units — mph, km/h, m/s, knots, feet per second. Free speed (velocity) unit converter.
A speed converter instantly translates between meters per second, kilometers per hour, miles per hour, knots, and feet per second — the most commonly used speed and velocity units worldwide. Whether you are comparing a European speed limit in km/h to mph, converting a running pace from m/s to km/h, or translating aviation speeds between knots and mph, this tool gives you accurate results in one view.
Each conversion uses exact SI and nautical definitions (1 km/h = 0.277778 m/s, 1 knot = 0.514444 m/s), so precision is guaranteed for driving, running, aviation, and physics use cases.
input
Result
Breakdown
- Value In Mps
- 16.666680
About Speed Converter
What is speed converter?
A speed converter instantly translates between meters per second, kilometers per hour, miles per hour, knots, and feet per second — the most commonly used speed and velocity units worldwide. Whether you are comparing a European speed limit in km/h to mph, converting a running pace from m/s to km/h, or translating aviation speeds between knots and mph, this tool gives you accurate results in one view. Each conversion uses exact SI and nautical definitions (1 km/h = 0.277778 m/s, 1 knot = 0.514444 m/s), so precision is guaranteed for driving, running, aviation, and physics use cases.
How to use this calculator
- Enter your value.
- Enter your from unit.
- Enter your to unit.
- Click the "Calculate" button.
- View your result instantly — the main result is displayed prominently at the top with a detailed breakdown below it.
When to use this calculator
- Converting European speed limits from km/h to mph for driving abroad
- Translating running or cycling speeds between m/s and km/h
- Converting aviation or maritime speeds between knots and mph
- Comparing wind speeds across metric and imperial weather reports
- Helping students learn metric-imperial velocity conversion relationships
How the calculation works
All speed conversions use a direct multiplier from the base unit (meters per second). Each unit has a fixed conversion factor: 1 km/h = 0.277778 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.514444 m/s, 1 ft/s = 0.3048 m/s. To convert, the calculator first translates your "from" value to m/s by multiplying by its factor, then translates m/s to the "to" unit by dividing by the target factor. For example, 60 mph to km/h: 60 × 0.44704 = 26.8224 m/s, then 26.8224 ÷ 0.277778 ≈ 96.56 km/h.
Frequently Asked Questions
How does the speed converter work?▼
What is a knot and who uses it?▼
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