Speed Calculator
Calculate speed from distance and time, convert between speed units, and explore common speed examples. Supports km/h, mph, m/s, knots, and many other speed units with detailed calculations.
Speed Calculator
Calculate speed from distance and time, convert between units, and explore preset speeds
Calculate Speed
Result
How to Use the Speed Calculator
Our speed calculator helps you calculate speed from distance and time using the fundamental physics formula: Speed = Distance ÷ Time. Enter your distance and time values, select the appropriate units, and get instant results with automatic unit conversions.
Speed Calculator Features
- Calculate speed from distance and time inputs
- Convert between multiple speed units (km/h, mph, m/s, knots)
- Preset speeds for common activities and vehicles
- History tracking for all calculations
- Unit conversion with precise factors
- Copy and download calculation results
Common Speed Units
- Kilometers per hour (km/h) - Common for vehicles
- Miles per hour (mph) - Used in US and UK
- Meters per second (m/s) - Scientific standard
- Feet per second (ft/s) - Engineering applications
- Knots (kn) - Maritime and aviation
- Mach - Supersonic speeds
Speed Formula and Examples
The basic speed formula is Speed = Distance ÷ Time. For example: if a car travels 120 kilometers in 2 hours, its speed is 120 ÷ 2 = 60 km/h. Our calculator handles all unit conversions automatically, so you can mix different distance and time units for flexible calculations.
Applications and Use Cases
Use our speed calculator for physics problems, travel planning, fitness tracking, vehicle performance analysis, and educational purposes. Perfect for students, engineers, athletes, and anyone needing accurate speed calculations with professional-grade unit conversion capabilities.
Frequently Asked Questions
What is the formula for speed?
Speed = Distance ÷ Time. Example: 120 km in 2 hours = 60 km/h. Rearranged: Distance = Speed × Time; Time = Distance ÷ Speed.
How do you convert km/h to mph?
Multiply km/h by 0.621371. Example: 100 km/h × 0.621371 = 62.14 mph.
How do you convert mph to m/s?
Multiply mph by 0.44704. Example: 60 mph × 0.44704 = 26.82 m/s.
What is the speed of sound?
Approximately 343 m/s (1,235 km/h / 767 mph) in air at 20°C. Speed of sound varies with temperature and medium.
How do you calculate average speed for a round trip?
Use the harmonic mean: (2 × v₁ × v₂) / (v₁ + v₂). Example: 60 mph out, 30 mph back → (2 × 60 × 30) / (60 + 30) = 40 mph average.