Speed Calculator - Calculate Speed, Distance & Time with Multiple Units
Speed Calculator
Speed Converter
Calculation Results
Enter values and click Calculate to see results
About the Speed Calculator
Our Speed Calculator is a comprehensive tool designed to help you calculate speed, distance, and time with ease. Whether you're planning a road trip, analyzing athletic performance, or solving physics problems, this calculator provides accurate results in multiple units.
The calculator supports three calculation modes: Find Speed (calculate speed from distance and time), Find Distance (calculate distance from speed and time), and Find Time (calculate time from speed and distance). Each mode provides automatic unit conversions and helpful insights.
With support for multiple units including kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), and knots, the calculator adapts to your needs whether you're measuring highway speeds, running pace, or maritime navigation.
Speed, Distance, and Time Formulas
Calculate Speed
Formula: Speed = Distance ÷ Time
Example: If you travel 150 km in 2 hours, your speed is 150 ÷ 2 = 75 km/h
Calculate Distance
Formula: Distance = Speed × Time
Example: At 60 km/h for 3 hours, you travel 60 × 3 = 180 km
Calculate Time
Formula: Time = Distance ÷ Speed
Example: To travel 200 km at 80 km/h takes 200 ÷ 80 = 2.5 hours (2 hours 30 minutes)
Speed Unit Conversions
| From | To | Multiply by |
|---|---|---|
| km/h | mph | 0.621371 |
| mph | km/h | 1.60934 |
| km/h | m/s | 0.277778 |
| m/s | km/h | 3.6 |
| knots | km/h | 1.852 |
| km/h | knots | 0.539957 |
Common Use Cases
🚗 Travel Planning
Calculate travel time for road trips, estimate arrival times, and plan rest stops based on average driving speeds.
🏃 Athletic Training
Track running pace, cycling speed, and swimming velocity to monitor training progress and set performance goals.
📚 Physics & Education
Solve physics problems involving kinematics, verify homework calculations, and understand motion concepts.
⛵ Maritime & Aviation
Convert between knots and other speed units for navigation, flight planning, and maritime applications.
Tips for Accurate Speed Calculations
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Use consistent units: Make sure all inputs use compatible units before calculating. Our calculator handles conversions automatically.
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Account for stops: When calculating trip time, remember that average speed includes all time, including stops and delays.
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Consider conditions: Actual travel speeds vary with traffic, weather, terrain, and road conditions.
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Use the converter: The built-in speed converter helps you understand speeds in different measurement systems.
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Safety first: Always follow posted speed limits and adjust your speed for current conditions.
Frequently Asked Questions
What is the formula for calculating speed?
Speed = Distance / Time. This fundamental formula calculates average speed by dividing the total distance traveled by the total time taken. For example, if you travel 100 km in 2 hours, your average speed is 50 km/h.
How do I convert km/h to mph?
To convert km/h to mph, multiply the speed by 0.621371. For example, 100 km/h = 62.14 mph. To convert mph to km/h, multiply by 1.60934. Our calculator handles these conversions automatically.
What is the difference between speed and velocity?
Speed is a scalar quantity that only measures how fast something is moving, while velocity is a vector quantity that includes both speed and direction. For most practical purposes, speed and velocity are used interchangeably.
How do I calculate travel time?
Travel Time = Distance / Speed. For example, to travel 300 km at 100 km/h, it will take 3 hours. Our calculator allows you to input distance and speed to automatically calculate the travel time.
What are knots and how do they relate to other speed units?
A knot is a unit of speed equal to one nautical mile per hour, commonly used in marine and aviation contexts. 1 knot = 1.852 km/h = 1.151 mph. Our calculator can convert between knots and other common speed units.
Can this calculator handle different units for inputs?
Yes! The calculator supports multiple units for both distance (kilometers, miles, meters, feet) and speed (km/h, mph, m/s, knots). Simply select your preferred unit from the dropdown menus.