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Calculate the Drag Coefficient


The drag coefficient cd is is a dimensionless measure for drag (fluid or air resistance). Density here is the density of the medium in which an object moves. 1.2 kg/m³ is an approximate value for air, water has 1000 kg/m³. Reference area is the projected frontal area of the object.

drag force = density * cd * reference area * velocity² / 2
Fd = ρ * cd * A * v² / 2

drag force: Newton
density: kg/m³
cd:
reference area:
velocity: m/s

Please enter four values, the fifth will be calculated. Here you can convert velocity units (e.g. in mph).





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