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Free terminal velocity calculator for estimating steady fall speed with air or fluid drag. Enter mass, gravity, drag coefficient, density, and area to model drag-force balance.
Last updated: April 20, 2026
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Terminal velocity
42.784 m/s
Drag force at terminal
784.800 N
Flow regime hint
Likely turbulent regime
Interpretation
Estimated terminal velocity is 42.784 m/s under quadratic drag assumptions.
Model assumption:
Uses quadratic drag model where drag balances weight at terminal speed.
Condition
mg = 0.5ρCdAv²
Input
Fluid density ρ
Inputs
Cd and cross-sectional area
m = 80 kg, Cd = 1.0, ρ = 1.225 kg/m³, A = 0.7 m²
Terminal velocity
42.78 m/s
Drag force at terminal
784.80 N
The calculator uses the standard quadratic drag balance for falling bodies. At terminal velocity, downward weight and upward drag are equal, so net acceleration is zero and speed stabilizes.
vₜ = √(2mg / (ρCdA))This model is most appropriate for medium-to-high Reynolds number conditions where quadratic drag dominates.
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