Speed Calculator
Calculate speed, distance, or time using the fundamental speed = distance ÷ time formula.
Frequently Asked Questions
How do I calculate average speed?
Average speed is calculated by dividing total distance by total time taken. The formula is Speed = Distance ÷ Time. For example, if you travel 120 miles in 2 hours, your average speed is 60 mph. Note that average speed accounts for the entire journey, including stops and slowdowns. It differs from instantaneous speed, which is your speed at any given moment as shown on a speedometer. Average speed is useful for trip planning and fuel consumption estimates.
How can I calculate travel time given speed and distance?
To find travel time, rearrange the speed formula: Time = Distance ÷ Speed. For example, if you're driving 300 miles at an average of 60 mph, your travel time is 300 ÷ 60 = 5 hours. Remember to account for rest stops, traffic, and route variations when planning real trips. GPS navigation apps calculate this dynamically using real-time traffic data, but the underlying formula remains the same straightforward division of distance by speed.
What units are used for speed in different contexts?
Speed is measured in different units depending on context. Road vehicles use miles per hour (mph) or kilometers per hour (km/h). Aviation and maritime navigation use knots (nautical miles per hour). Physics often uses meters per second (m/s). Running and cycling use minutes per mile or minutes per kilometer (pace). Wind speed is measured in mph, km/h, or the Beaufort scale. Converting between these units is important for safety, navigation accuracy, and comparing performance data across different systems.