What is the Speed Calculator?
Calculate average speed from distance and time. These physics and science calculators apply standard SI formulas with exact constants (such as g = 9.80665 m/s² and the 2019 SI definitions) for students, engineers and curious minds.
How to use the Speed Calculator
- Enter your distance, your time.
- Results update automatically as you type; you can also press Calculate.
- Read the output: speed, in mph, in m/s.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With distance = 150 km, time = 2.5 hours, the Speed Calculator returns speed: 60.00 km/h; in mph: 37.28 mph; in m/s: 16.667 m/s.
Tips for better results
- Convert inputs into SI units first for the cleanest results.
- Idealized formulas ignore friction and air resistance unless stated.
- Use our unit converters to switch between metric and imperial results.
Frequently asked questions
What does the Speed Calculator do?
Calculate average speed from distance and time.
How is it calculated?
The Speed Calculator uses this method: Speed = Distance ÷ Time.
Can you show an example?
With distance = 150 km, time = 2.5 hours, the Speed Calculator returns speed: 60.00 km/h; in mph: 37.28 mph; in m/s: 16.667 m/s.
Is the Speed Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Speed Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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