ONE FORMULA, ONE ANSWER
Drag Force Calculator
Check a drag load using a known wind-tunnel drag coefficient. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Drag force D
Enter values and select Calculate.
D = C_D ρ V² A / 2
Assumptions
Use C_D,V≥0 and ρ,A>0. Match the reference area, Reynolds number, Mach number and geometry used to define the drag coefficient. Geometry alone does not determine the coefficient.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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