Terminal Velocity Calculator
Estimate terminal falling speed with quadratic drag, constant coefficients and negligible buoyancy.
Formula
vₜ = √(2mg/(ρCᴅA))
Mass: 80 kg · Frontal area: 0.7 m² · Fluid density: 1.225 kg/m³ · Terminal speed ≈ sqrt(2×(80 kg)×(9.81)÷((1.225 kg/m³)×(1)×(0.7 m²)))
How to use
- Enter mass and frontal area.
- Enter fluid density, drag coefficient and gravity.
- Read terminal speed relative to the fluid.
Examples
- 10 kg, g = 10, ρ = 2, Cᴅ = 1 and A = 1 m² gives 10 m/s.
Frequently asked questions
Which area is required?
The projected area perpendicular to motion, consistent with your drag coefficient.
Is the default density universal?
No. Density and drag coefficient depend on conditions; replace the examples with your values.
When is this unsuitable?
For strong buoyancy, low-Reynolds-number linear drag, or changing posture and fluid conditions.
Sources
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