Our Speed Converter allows you to quickly and accurately convert between meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), Mach, feet per second (ft/s), and inches per second (in/s).
🧮 How the Converter Works
Speed conversion uses fixed multiplication factors between units. The converter normally converts the input to a canonical internal unit (meters per second) and then applies factors to produce the other units. Key relationships used include:
- 1 m/s = 3.6 km/h
- 1 m/s ≈ 2.23694 mph
- 1 knot = 0.514444 m/s (so 1 m/s ≈ 1.94384 knots)
- Mach varies with air temperature, but at sea level (standard conditions) Mach 1 ≈ 340.29 m/s — the converter uses the standard speed of sound unless you specify environmental conditions.
- 1 ft/s = 0.3048 m/s (so 1 m/s ≈ 3.28084 ft/s)
- 1 in/s = 0.0254 m/s (so 1 m/s ≈ 39.3701 in/s)
By converting the input to m/s first, the tool applies these factors consistently to generate precise equivalents across all units.
Speed Converter
Reference Table
| m/s | km/h | mph | kn | Mach | ft/s | in/s |
|---|---|---|---|---|---|---|
| 1 | 3.6 | 2.23694 | 1.94384 | 0.002938 | 3.28084 | 39.3701 |
🚀 Speed Converter — convert between common speed units
A speed converter helps you instantly translate speeds between different unit systems used in science, transport, aviation, and everyday life. Our tool supports the most common and technical units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, Mach, feet per second (ft/s) and inches per second (in/s). Whether you’re analysing motion in physics, checking vehicle performance, or converting aviation and nautical speeds, this converter gives accurate results in seconds.
🔄 What the Speed Converter Does
Enter any speed value in one unit and the converter will display the equivalent speeds across all supported units. You can convert:
- m/s → km/h, mph, knots, Mach, ft/s, in/s
- km/h → m/s, mph, knots, Mach, ft/s, in/s
- mph → m/s, km/h, knots, Mach, ft/s, in/s
- and so on for each supported input unit.
This eliminates manual arithmetic and unit-conversion errors and gives you consistent, scientifically correct results for every use case.
🌍 Where and why to use a speed converter
A reliable speed converter is useful in many fields:
- Science & Engineering: convert experimental results, sensor outputs, or physics problems between SI and imperial units.
- Automotive & Transportation: check vehicle speeds in mph or km/h depending on region; convert test results and telemetry.
- Aviation & Maritime: convert between knots and km/h/mph for navigation or planning.
- Aerospace & Meteorology: compare speeds to Mach number for aviation and supersonic contexts (note: Mach varies with altitude/temperature).
- Sports & Performance: translate split pace (m/s or ft/s) to more familiar km/h or mph for athlete training.
- Everyday use: convert speedometer values, treadmill displays, or sensor data for international compatibility.
⚙️ Accuracy notes & best practices
- Mach depends on the local speed of sound which varies with air temperature and pressure. The converter uses a standard reference (sea-level, 15°C) by default — for precise aerospace work, use temperature-adjusted Mach calculations.
- Knots are nautical miles per hour; use them for maritime and aviation contexts.
- For scientific accuracy, the converter uses double-precision multipliers and shows rounded results with an appropriate number of decimals so values remain readable without losing precision.
🚀 Why our Speed Converter stands out
- Supports technical and everyday units (m/s, km/h, mph, knots, Mach, ft/s, in/s).
- Fast, accurate, and consistent — converts via m/s as a canonical unit to avoid rounding errors.
- Clear results and unit labels for easy interpretation.
- Mobile-friendly and responsive so you can convert on the go.
- Ideal for students, engineers, pilots, sailors, athletes, and everyday users needing fast unit conversions.