Velocity Calculator — Speed, Distance & Time Calculator (v = d/t)Speed, Distance & Time — v = d/t Formulav = d/t · d = v×t · t = d/v · m/s · km/h · mph · ft/s
Use this free Velocity Calculator to instantly solve any unknown variable in the fundamental speed, distance, and time formula of classical kinematics: v = d / t — where v is velocity or speed, d is distance, and t is time. Enter any two known values to automatically solve the third — computing: velocity (v = d / t) · distance (d = v × t) · time (t = d / v) — with automatic unit conversion across all standard speed and distance units: m/s · km/h · mph · ft/s · knots — covering both average velocity and instantaneous speed calculations.
This online speed distance time calculator is trusted across every physics and engineering application: A-Level, GCSE, AP Physics, JEE, and NEET kinematics and motion problems, vehicle speed and travel time calculation, running, cycling & swimming pace and speed analysis, aviation groundspeed and flight time estimation, projectile and ballistics velocity calculation, and engineering motion analysis and conveyor belt speed calculation. Understanding the speed-distance-time triangle — and the distinction between scalar speed and vector velocity (speed with direction) — is the foundational concept of Newtonian kinematics, uniform motion, and relative velocity problems in both classical and applied physics.
⚠ Physics Disclaimer: This velocity calculator applies the uniform motion formula v = d/t and assumes constant velocity with zero acceleration. It does not account for acceleration or deceleration (use v = u + at for uniformly accelerated motion), air resistance and drag forces, friction and surface resistance, relativistic effects at near-light speeds, or non-linear motion paths. For accelerated motion problems, use our Kinematic Equations Calculator. Always verify results with a qualified physics teacher or mechanical engineer for safety-critical motion analysis.
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Velocity Calculator — Speed, Distance, and Time With the Right Kinematic Equation
Velocity is the rate of change of position — a vector quantity with both magnitude (speed) and direction. The kinematic equations relating velocity, acceleration, time, and displacement cover the vast majority of motion problems in physics and engineering. Whether calculating how long it takes a braking car to stop, how far a projectile travels horizontally, or what speed a roller coaster car reaches at the bottom of a descent, the same five equations apply. The velocity calculator solves all kinematic configurations by identifying which variables are known and applying the appropriate equation automatically.
Average velocity and instantaneous velocity are different measurements that answer different questions. Average velocity over a trip is total displacement divided by total time — a car that travels 100 km in 1.5 hours has an average velocity of 66.7 km/h regardless of how much it varied during the journey. Instantaneous velocity is what the speedometer reads at any given moment. Physics problems specify which they need; the calculator handles both, with clear labeling so the distinction is not lost.
Relative velocity — the velocity of one object as observed from another moving reference frame — is where velocity calculations become counterintuitive. A car traveling at 80 km/h overtaking another car at 70 km/h has a relative velocity of 10 km/h from the perspective of the slower car. A head-on approach between two cars each traveling at 80 km/h has a relative velocity of 160 km/h — the combined closing speed, which is why head-on collisions are so much more severe than rear-end impacts at the same individual speeds.