Drag Equation Calculator
Calculate aerodynamic drag for objects moving through a fluid.
How to Use This Calculator
- Enter fluid density (air ≈ 1.225 kg/m³ at sea level).
- Provide velocity, drag coefficient, and reference area.
- Click Calculate to get Fd in Newtons.
Formula
Fd = ½ ρ v² Cd A
Cd depends on shape and Reynolds number; A is frontal or reference area per convention.
Frequently Asked Questions
What is a typical Cd?
Sphere ~0.47, streamlined car ~0.25–0.35, flat plate normal to flow ~1.28.
Does density vary?
Yes, with altitude and temperature. Use appropriate ρ for your conditions.