Speed Converter
Convert between km/h, mph, m/s and knots.
About Speed Converter
The GuruAlpha Speed Converter converts between kilometers per hour (km/h), miles per hour (mph), meters per second (m/s) and knots (nmi/h). Enter a speed in any unit and see the equivalent in all others instantly. Essential for driving, aviation, sports and international travel.
Speed conversion is needed in driving (km/h to mph when traveling between countries), aviation (knots to km/h), sports (converting running speeds and wind speeds) and shipping (knots to mph for marine weather). The Speed Converter handles all these contexts with accurate, instant results.
The converter supports 4 speed units: km/h (most countries), mph (US, UK), m/s (scientific) and knots (maritime, aviation). The conversion factors are exact: 1 mph = 1.60934 km/h, 1 knot = 1.852 km/h, 1 m/s = 3.6 km/h.
The tool includes common speed references for context: average walking speed (5 km/h), highway speed limits (100-120 km/h), speed of sound (1,235 km/h) and speed of light (1,079,252,849 km/h). These references help users understand the magnitude of the converted values.
For travelers driving abroad, the converter is essential. Rental cars display speed in the local unit — mph in the UK, km/h in Europe. Knowing the conversion helps you stay within speed limits and drive safely. The tool also converts wind speeds for weather interpretation across different reporting standards.
Key Features of Speed Converter
- Convert between km/h, mph, m/s and knots
- Instant conversion in all units simultaneously
- Common speed reference points
- Handles extreme values (speed of light)
- Copy any result with one click
- Works on all devices
- No sign-up required
- Visual speed comparison
How to Use Speed Converter
- Open the Speed Converter on GuruAlpha.
- Enter a speed in any unit.
- All other units update instantly.
- View common speed references for context.
- Copy any result for use in calculations.
Tips for Using Speed Converter
- 1 mph ≈ 1.6 km/h — essential for UK driving.
- 1 knot = 1.852 km/h — used in maritime and aviation.
- Highway speed limits: 120 km/h ≈ 75 mph.
- Use m/s for physics calculations.
- The reference points help understand the magnitude of speeds.
Frequently Asked Questions About Speed Converter
What is a knot?
A knot is one nautical mile per hour. 1 knot = 1.852 km/h = 1.151 mph. Used in maritime and aviation navigation.
Which unit do most countries use?
Most countries use km/h. The US, UK and a few others use mph. Science uses m/s. Maritime and aviation use knots.
How fast is the speed of sound?
approximately 1,235 km/h = 767 mph = 343 m/s = 667 knots at sea level in dry air at 20°C.
Can I convert running speed?
Yes. Enter your pace in any unit — km/h, mph or min/km — and convert for international comparisons.