# Lift Force

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Lift force, abbreviated as L, for an body moving through a fluid (gas or liquid) or air, is the force exerted perpendicular to the direction of travel.

## Lift Force formulas

 $$\large{ L = \frac{1}{2} \; C_l \; \rho \; v^2 \; A }$$ $$\large{ L = \frac{ C_l \; \rho \; v^2 \; A }{ 2 } }$$

### Where:

 Units English Metric $$\large{ L }$$ = lift force $$\large{ lbf }$$ $$\large{N}$$ $$\large{ A }$$ = area $$\large{ ft^2 }$$ $$\large{ m^2 }$$ $$\large{ \rho }$$  (Greek symbol rho) = density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$\large{ C_l }$$ = lift coefficient $$\large{ dimensionless }$$ $$\large{ v }$$ = velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$