Drag Force Calculator

Frequently Asked Questions

How does speed affect drag force?

Drag grows with the square of velocity, so doubling the speed quadruples the drag force everything else being equal.

What is a typical drag coefficient?

A streamlined airfoil is near 0.05, a car around 0.3, a sphere about 0.47, and a flat plate facing the flow above 1.2.

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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How This Calculator Works

The drag equation gives the aerodynamic resistance a body feels as it moves through a fluid. The force grows with the fluid density, the frontal area, the drag coefficient of the shape, and most strongly with the square of the speed. Because of the velocity squared term, doubling the speed quadruples the drag force.

Typical Drag Coefficients

A streamlined airfoil has a drag coefficient near 0.05, a modern car sits around 0.3, a sphere is about 0.47, and a flat plate facing the flow approaches 1.2 or higher. The reference area is usually the projected frontal area in the direction of motion.

Tips

Speed dominates: small velocity changes shift drag sharply.

Air density falls with altitude, reducing drag.

Use the frontal area for blunt bodies.

Frequently Asked Questions

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