Speed Calculator
Calculate speed, distance, or time using S = D/T. Supports mph, km/h, m/s, knots, and more.
About the Speed Calculator
Speed, distance, and time are related by the formula S = D/T. This calculator lets you solve for any one of the three variables and automatically converts between common units like mph, km/h, m/s, knots, and ft/s. It's useful for trip planning, physics homework, and sports performance analysis. For driving-related calculations, you may also want to use our Gas Mileage Calculator to track fuel efficiency on your journey.
Whether you're calculating how long a road trip will take or converting between metric and imperial speed units, this tool handles it all in one place. For running and cycling, our Fuel Cost Calculator can help you estimate the cost of travel at any speed or distance.
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For a related calculation, use Molarity Calculator to calculate molarity, moles, or volume for solutions. Outputs mol/L, mmol/L, and μmol/L. Alternatively, use Density Calculator to solve for density, mass, or volume using D = M/V. Supports multiple unit systems with conversions.