Calculate velocity, distance, or time using the v=d/t formula. Get instant results in m/s, km/h, and mph. Free online physics calculator for students and professionals.
A velocity calculator helps you find speed, distance, or time using the fundamental kinematics formula velocity = distance ÷ time. Velocity is one of the most basic and important quantities in physics, describing how fast an object moves — though in everyday use (and in this calculator), "velocity" and "speed" are often used interchangeably to mean the magnitude of motion, measured in meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
This calculator solves for whichever value you need: enter distance and time to find velocity, enter velocity and time to find distance, or enter velocity and distance to find time. This flexibility makes it useful for a wide range of real-world problems — from calculating a runner's pace, to estimating a vehicle's speed from a known distance and travel time, to solving physics homework problems involving constant-velocity motion.
Understanding velocity is the foundation for more advanced kinematics concepts like acceleration (the rate of change of velocity) and momentum (mass times velocity). Whether you're a student learning the basics of motion, an athlete tracking performance, or an engineer analyzing a moving system, this calculator gives you instant, accurate results with automatic unit conversion between the three most commonly used speed units.
A cyclist travels 300 meters in 25 seconds. Dividing distance by time: 300 ÷ 25 = 12 m/s. Converting to more familiar units, that's 12 × 3.6 = 43.2 km/h, or 12 × 2.237 = 26.8 mph — a solid average speed for a casual bike ride. If the cyclist wants to know how long it would take to cover 5,000 meters at that same 12 m/s pace, they can enter the velocity and distance to solve for time instead: 5,000 ÷ 12 = 416.7 seconds, or about 6.9 minutes.
The result of this calculator represents average velocity over the distance and time you entered — not the speed at any single instant, which may have been faster or slower during the trip. For motion in a straight line at constant speed, average and instantaneous velocity are the same, making this calculator's result directly usable. When comparing your result to real-world references, km/h and mph are usually more intuitive than m/s. For context, a brisk walk is about 5-6 km/h (1.4-1.7 m/s), a bicycle ride is 15-25 km/h (4-7 m/s), and highway driving speeds are typically 90-120 km/h (25-33 m/s). If your calculation involves an object that was speeding up or slowing down rather than moving at a constant rate, this simple v = d/t formula will only give you the average velocity over the whole trip — not the velocity at any specific moment. For problems involving acceleration, you'll need additional kinematics equations that factor in the rate of change of velocity.
Enter any two values (distance, time, or velocity) to calculate the third.