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

Pression dynamique245.0000 Pa

Drag Force vs Drag Coefficient (Cd)

Voir la formule →

Formule

## Aerodynamic Drag Force Drag opposes the motion of an object through a fluid. ### Formula **F_d = 0.5 Cd rho A v^2** - *Cd* = drag coefficient (shape-dependent, dimensionless) - *rho* = fluid density - *A* = reference frontal area - *v* = velocity relative to fluid Common Cd values: sphere 0.47, streamlined body 0.04, flat plate 1.28, car 0.25-0.45.

Exemple Résolu

Sphere (Cd = 0.47) of cross-section 0.01 m2 in air at 20 m/s.

  1. 01F_d = 0.5 * 0.47 * 1.225 * 0.01 * 400
  2. 02F_d = 0.235 * 1.225 * 4
  3. 03F_d = 1.152 N