Speed Converter
Convert between different speed and velocity units including mph, km/h, m/s, knots, and more. Perfect for automotive, aviation, marine, sports, and scientific calculations.
Enter Speed Value
Common Speed Conversions
Speed & Velocity Units Guide
Speed measures how fast an object moves over time. Different industries use various units, with mph and km/h being most common for vehicles, knots for marine and aviation, and m/s for scientific applications.
Common Speed Units
Miles per Hour (mph)
Common in US for vehicle speeds and speed limits
Kilometers per Hour (km/h)
Used worldwide for vehicle speeds and weather
Knots
Nautical miles per hour, used in aviation and marine
Meters per Second (m/s)
SI unit, used in physics and scientific applications
Mach
Speed relative to sound (343 m/s at sea level)
Conversion Factors
| From | To | Multiply by |
|---|---|---|
| MPH | KM/H | 1.60934 |
| KM/H | MPH | 0.621371 |
| Knots | KM/H | 1.852 |
| M/S | KM/H | 3.6 |
| Mach | M/S | 343 |
Speed vs Velocity
- Speed: How fast an object moves (scalar quantity)
- Velocity: Speed with direction (vector quantity)
- Average Speed: Total distance ÷ total time
- Instantaneous Speed: Speed at a specific moment
Application Examples
Automotive
- • Speed limits
- • Vehicle performance
- • Fuel efficiency
- • Safety calculations
Aviation
- • Airspeed indicators
- • Wind speed
- • Flight planning
- • Performance charts
Marine
- • Vessel speed
- • Current speed
- • Weather routing
- • Navigation planning
Sports
- • Running pace
- • Cycling speed
- • Racing performance
- • Training metrics
Pro Tip
When converting between speed units, remember that knots are based on nautical miles (1.852 km), which is why 1 knot = 1.852 km/h exactly.
Speed Converter Answers
What does the speed converter do?
The speed converter allows you to quickly convert between different units of speed, such as kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), and more.
Which speed units can I convert?
Common units include km/h, mph, m/s, feet per second (ft/s), and knots. The tool supports converting between any of these with high accuracy.
Is this tool useful for travel or science?
Yes. It’s helpful for comparing vehicle speeds, converting scientific measurements, or understanding motion in different systems like aviation, navigation, and physics.
Can I use decimals or large numbers?
Absolutely. The calculator accepts decimal values and handles large numbers with precision, making it suitable for both simple and advanced conversions.