Calculate speed, distance, or time using the speed formula.
The Speed Calculator solves the speed, distance, and time formula — enter any two of the three values and it calculates the third, with support for common units like mph, km/h, and m/s. It's free and calculates instantly in your browser, handy for trip planning or a quick physics problem.
Made for everyone. Typical uses:
Explore more in Calculators, read the guides and articles, or see how we test our tools.
Calculate running pace, speed, and race times.
Best for figuring out what pace you need to hold to hit a marathon goal time
Estimate fuel costs for any trip based on distance, fuel efficiency, and gas prices.
Best for budgeting for a road trip before you leave
Calculate calories burned during exercise based on activity, duration, and weight.
Best for sizing a workout session to hit a specific calorie deficit target
Estimate your monthly car payment, total interest and total cost with down payment, trade-in and sales tax.
Best for seeing how a 48, 60 or 72 month term changes the payment and the total interest, one setting at a time
Calculate voltage, current, resistance, and power using Ohm's Law.
Best for sizing a current-limiting resistor for an LED circuit