What is velocity?
Velocity is how fast something moves in a given direction. The simplest way to find it is v = d / t: distance divided by time. Usain Bolt covering 100 m in 9.58 s had an average velocity of about 10.44 m/s—or 37.58 km/h if you prefer. Strictly speaking, velocity has direction (it's a vector), while speed is just the number. For straight-line motion they're the same, and that's what this calculator handles.
How to calculate velocity
Calculate velocity from distance and time: v = d / t. Or use the kinematic equation v = u + at when you have initial velocity, acceleration, and time. This velocity calculator supports both. Pick "Find v | Given d and t" for how to calculate velocity with distance and time, or "Find v | Given u, a and t" for accelerated motion.
Velocity calculation
The velocity calculation uses v = d/t for constant speed, or v = u + at for acceleration. Choose your calculation from the dropdown, enter the known values and units, then click Calculate. The calculation for velocity is done instantly. Calculating velocity with this tool gives results in m/s, km/h, mph, ft/s, or knots.
How do you calculate velocity?
How do you calculate velocity? For distance and time: v = d/t. For initial velocity, acceleration, and time: v = u + at. How do u calculate velocity? Use this velocity calculator—select the unknown, enter the knowns, click Calculate. How to convert speed to velocity? Speed and velocity have the same magnitude; this calculator gives the numeric value in your chosen units.
How to use this velocity calculator
Pick what you want to find—velocity (v), initial velocity (u), acceleration (a), time (t), or distance (d)—from "Choose a Calculation". Enter the known values and select units. Set significant figures if needed. Click Calculate for the result, or Clear to reset. The formula is shown above the inputs.
The formulas: v = d/t and v = u + at
From v = d / t you get d = v × t and t = d / v. For acceleration: v = u + at, u = v - at, a = (v-u)/t, t = (v-u)/a. The calculator rearranges for you—choose the unknown and enter the knowns.
When do people use this?
Athletes check average speed. Drivers work out travel time. Pilots convert knots and km/h. Students use it for homework. This tool is free, works offline once loaded, and requires no sign-up.
A few things to keep in mind
Use consistent units. The result is the average velocity for v=d/t. Time can't be zero. Bookmark this page for quick velocity calculations.