Free Drag Coefficient Calculator
Calculate the drag force on an object: F_d = 0.5 * Cd * rho * A * v^2, or solve for Cd from measured drag.
kg/m3
m2
m/s
Drag Force
1.1515 N
Dynamic Pressure245.0000 Pa
Drag Force vs Drag Coefficient (Cd)
Aerodynamic Drag Force
Drag opposes the motion of an object through a fluid.
Formula
F_d = 0.5 Cd rho A v^2
Common Cd values: sphere 0.47, streamlined body 0.04, flat plate 1.28, car 0.25-0.45.
Example Calculation
Sphere (Cd = 0.47) of cross-section 0.01 m2 in air at 20 m/s.
- 01F_d = 0.5 * 0.47 * 1.225 * 0.01 * 400
- 02F_d = 0.235 * 1.225 * 4
- 03F_d = 1.152 N
Frequently Asked Questions
Learn More
Understanding Newton's Laws of Motion
A comprehensive guide to Newton's three laws of motion. Learn about inertia, force and acceleration, action-reaction pairs, and how these principles govern everyday physics.