Acceleration Calculator
Calculate acceleration using five fundamental physics formulas. Choose linear acceleration from velocity change, Newton's second law (F=ma), centripetal acceleration for circular motion, gravitational acceleration on different planets, or angular acceleration. Each calculation shows step-by-step working so you can follow the solution.
The Acceleration Calculator is a free, browser-based physics tool that finds acceleration from whichever values you know — velocity change and time, force and mass, speed and radius, a chosen planet or moon, or angular velocity. Pick the matching mode, enter your numbers in SI units, and it shows the answer with each step worked out. Updated 2026-11-06.
How Acceleration Calculations Work
Acceleration measures how quickly an object's velocity changes over time. In physics, it is a vector quantity, meaning it has both magnitude and direction. The standard unit of acceleration is metres per second squared (m/s²). When an object speeds up, it has positive acceleration. When it slows down, the acceleration is negative, often called deceleration. This calculator supports five distinct acceleration formulas, each suited to a different physical scenario. Linear acceleration uses the basic kinematic equation a = (v - u) / t, where v is final velocity, u is initial velocity, and t is time. Newton's second law gives a = F / m, connecting force directly to the acceleration it produces on a given mass.
Core Acceleration Formulas
a = (v - u) / t— Linear acceleration from velocity changea = F / m— Acceleration from Newton's second lawa = v² / r— Centripetal acceleration in circular motionα = (ω&sub2; - ω&sub1;) / t— Angular acceleration
Types of Acceleration in Physics
Linear acceleration is the most commonly encountered type, describing straight-line motion where speed increases or decreases uniformly. Centripetal acceleration acts on any object moving in a circle, directed toward the centre of the circular path. Even if the object maintains constant speed, it is accelerating because the direction of velocity is continuously changing. Angular acceleration describes how quickly an object's rotational speed changes, measured in radians per second squared (rad/s²). Force-based acceleration, derived from F = ma, is essential in engineering and mechanics, where you know the applied force and need to determine how fast an object will accelerate. Gravitational acceleration varies by celestial body and determines how fast objects fall near a planet's surface.
Acceleration Formula Calculator: Which Formula Fits Your Numbers?
Choosing the formula is the step most people get stuck on, so match it to the values you already have. Each row below is one mode of this acceleration formula calculator; units follow the SI conventions set out by NIST, with acceleration in metres per second squared.
- Start speed, end speed and time: a = (v − u) / t — choose Linear.
- Force and mass: a = F / m (Newton’s second law) — choose From Force.
- Speed around a curve and its radius: a = v² / r — choose Centripetal.
- Surface gravity of a planet or moon: g = GM / r² — choose Gravitational (Planet Presets) and pick the body, or enter a custom value.
- Change in spin rate and time: α = (ω₂ − ω₁) / t — choose Angular.
Only know distance and time from a standing start? Rearrange d = ½at² to a = 2d / t² and work it by hand, or find the final speed first and use the linear mode.
Acceleration on Different Planets
Gravitational acceleration depends on a planet's mass and radius. On Earth, the standard value is 9.81 m/s². The Moon's gravitational acceleration is just 1.62 m/s², roughly one-sixth of Earth's, which is why astronauts could jump much higher on the lunar surface. Mars has a gravitational acceleration of 3.72 m/s², important for planning future missions and understanding how equipment and humans will perform there. Jupiter, the largest planet in our solar system, has a gravitational pull of 24.79 m/s², more than twice Earth's gravity. Venus is closest to Earth at 8.87 m/s². Understanding these differences is critical for space exploration, satellite design, and astrophysics calculations.
Acceleration in Everyday Life
Acceleration is not just an abstract physics concept. When you press the accelerator in a car, the engine applies a force that accelerates the vehicle. A sports car that goes from 0 to 100 km/h in 3 seconds has an acceleration of about 9.26 m/s², nearly equal to Earth's gravitational acceleration. Roller coasters subject riders to centripetal accelerations of 3 to 6 g during loops and turns. Even walking involves acceleration as you push off the ground with each step. In engineering, understanding acceleration is essential for designing bridges, buildings, vehicles, and safety systems. Crash test ratings depend on the deceleration forces a vehicle can absorb to protect occupants.
Frequently Asked Questions
What is the formula for acceleration?
The most common formula is a = (v - u) / t, where a is acceleration, v is final velocity, u is initial velocity, and t is time. This gives the average acceleration over the time interval. Other formulas include a = F/m from Newton's second law and a = v²/r for centripetal acceleration in circular motion.
What is the difference between linear and angular acceleration?
Linear acceleration measures the rate of change of linear velocity (m/s²) along a straight path. Angular acceleration measures the rate of change of angular velocity (rad/s²) around an axis of rotation. They are related: linear acceleration at a point on a rotating object equals the angular acceleration multiplied by the radius (a = αr).
Can acceleration be negative?
Yes. Negative acceleration means the object is slowing down (decelerating) in the positive direction, or speeding up in the negative direction. For example, a car braking from 60 km/h to 0 has negative acceleration. The sign depends on your chosen coordinate system and direction of motion.
What is centripetal acceleration?
Centripetal acceleration is the acceleration experienced by an object moving in a circular path. It always points toward the centre of the circle and has magnitude a = v²/r, where v is the tangential speed and r is the radius. Even at constant speed, the object accelerates because the direction of velocity continuously changes.
Why is gravitational acceleration different on each planet?
Gravitational acceleration depends on a planet's mass and radius according to g = GM/r², where G is the gravitational constant, M is the planet's mass, and r is its radius. Larger, denser planets have stronger gravitational fields. Jupiter has the highest g among our solar system's planets at 24.79 m/s², while the Moon has only 1.62 m/s².
How do I convert acceleration units?
1 m/s² is the SI unit. To convert to g-force, divide by 9.81 (1 g = 9.81 m/s²). To convert to km/h², multiply by 12960. To convert to ft/s², multiply by 3.281. This calculator outputs results in m/s² and also shows the equivalent in g-force for easy comparison.
What is an acceleration calculator?
An acceleration calculator works out how fast velocity changes from the values you already know. This one has five modes: velocity change over time, force and mass, centripetal motion, surface gravity on a chosen planet or moon, and angular acceleration. Each result shows the formula and the working so you can check it against your textbook.
How do I find acceleration from distance and time?
If the object starts from rest and accelerates evenly, use d = ½at² rearranged to a = 2d / t². Divide twice the distance by the time squared. If it was already moving, subtract the distance it would have covered at its starting speed first, or find its final speed and use the linear mode.