Work out drag force instantly with clear inputs, formula shown and shareable results.
Drag grows with the square of speed: F = 0.5 rho v^2 Cd A. A car with Cd 0.32 and 2.2 m2 frontal area at 100 km/h meets about 333 N of air resistance, needing 9.2 kW just to push the air aside. Because power is drag times speed, it grows with the cube of speed - the reason motorway cruising dominates fuel use.
Drag force
F = 0.5 x rho x v^2 x Cd x A
Power
P = F x v, so P scales as v^3
Because drag depends on both. A slippery but large vehicle can have more drag than a boxy small one, and CdA captures the combination.
About 0.25-0.35 for modern cars, 0.5-0.7 for a cyclist upright, 0.04 for an aerofoil, and 1.1-1.3 for a flat plate.