What is terminal velocity and when does it occur?

Terminal velocity is the constant speed a falling object reaches when the downward force of gravity equals the upward drag force from the fluid, resulting in zero net acceleration. It occurs once the object has fallen far enough for air resistance to balance its weight.

What inputs are needed to calculate terminal velocity?

You need the object’s mass, cross-sectional area, the drag coefficient (which depends on shape), and the density of the fluid it is falling through, plus gravitational acceleration if different from standard Earth gravity.

Can I calculate terminal velocity for objects falling through liquids, not just air?

Yes, the same formula applies. Just replace the air density with the density of the liquid (e.g., water or oil) and ensure the drag coefficient reflects the object’s shape in that medium.

Why do a skydiver’s terminal velocity changes when they change body position?

Changing body position alters the cross-sectional area and the drag coefficient. A spread-eagle position increases area and drag, lowering terminal velocity, while a head-down tuck reduces area and drag, increasing it.

Does altitude affect terminal velocity calculations?

Yes, because air density decreases with altitude. A calculator that includes fluid density as an input will give a higher terminal velocity at higher altitudes than at sea level, all else being equal.

Classical Mechanics2 options compared

Terminal Velocity Calculator

Calculates terminal velocity, estimating the maximum speed an object reaches when falling through a fluid medium due to gravity and air resistance. Users input parameters like object mass, drag coefficient, and fluid density, then the calculator computes the theoretical terminal velocity based on classical mechanics principles. Scientists, engineers, and anyone interested in understanding fluid...

Kinematics calculators — How things move

Editors’ Top PickBased on community votes

Number Convert

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Calculate your terminal velocity with our free online tool. Get accurate results instantly. No signup required.

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Omni Calculator
omnicalculator.com
Determine the maximum velocity achievable by a falling object using the terminal velocity calculator.
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Terminal Velocity Calculator options compared

Tool	Best for	Strengths	Limitations
Number Convert numberconvert.com	Quick estimates without shape selection	No signup required Simple parameter inputs	No shape presets Ads on the page
Omni Calculator omnicalculator.com	Users who want shape presets	Shape presets (sphere, cube, etc.) Clean interface with no ads	Requires account to save results More fields to fill out

Buyer's guide

How to choose a terminal velocity calculator

When picking a terminal velocity calculator, the key factors are the inputs you have on hand and how much you want to fine-tune the result. If you know the exact drag coefficient of your object, Number Convert lets you enter it directly without picking from a list. If you are unsure about the shape, Omni Calculator’s presets let you test common objects quickly without guessing a Cd value. The difference matters most when the object’s shape is irregular or when you are comparing several shapes side by side.

Questions

Terminal Velocity Calculator FAQ

What is terminal velocity and when does it occur?: Terminal velocity is the constant speed a falling object reaches when the downward force of gravity equals the upward drag force from the fluid, resulting in zero net acceleration. It occurs once the object has fallen far enough for air resistance to balance its weight.
What inputs are needed to calculate terminal velocity?: You need the object’s mass, cross-sectional area, the drag coefficient (which depends on shape), and the density of the fluid it is falling through, plus gravitational acceleration if different from standard Earth gravity.
Can I calculate terminal velocity for objects falling through liquids, not just air?: Yes, the same formula applies. Just replace the air density with the density of the liquid (e.g., water or oil) and ensure the drag coefficient reflects the object’s shape in that medium.
Why do a skydiver’s terminal velocity changes when they change body position?: Changing body position alters the cross-sectional area and the drag coefficient. A spread-eagle position increases area and drag, lowering terminal velocity, while a head-down tuck reduces area and drag, increasing it.
Does altitude affect terminal velocity calculations?: Yes, because air density decreases with altitude. A calculator that includes fluid density as an input will give a higher terminal velocity at higher altitudes than at sea level, all else being equal.

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