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Drag Force Calculator — Fluid Dynamic Drag
Calculate aerodynamic or hydrodynamic drag from density, velocity, drag coefficient and reference area.
Last updated: September 17, 2026
Results
Use positive density and non-negative velocity, Cd and area
Formula, example and assumptions
Fd=0.5ρv²CdA.
At 20 m/s in air ρ=1.2 kg/m³, Cd=0.8 and A=1 m², drag is 192 N.
- Cd and reference area must use the same convention as the source data.
- Density and Cd are treated as constant at the entered condition.
Frequently asked questions
What does this Drag Force Calculator solve?
Calculate aerodynamic or hydrodynamic drag from density, velocity, drag coefficient and reference area.
Which units should I use?
Use the SI units shown beside each input. The results also expose practical converted outputs where useful.
Can I use this for final equipment selection?
Use it for transparent engineering estimates and cross-checks. Confirm fluid properties, manufacturer curves and applicable design codes before final selection.