# Lux to lumens conversion calculator

## Lux to lumens manual calculation

**area in square feet**

luminous flux ΦV in lumens (lm) is equal to 0.09290304 multiplied by illuminance Ev in lux (lx) multiplied by the surface area A in square feet (ft2)

ΦV(lm) = 0.09290304 × Ev(lx) × A(ft2)

luminous flux ΦV in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times 4 times pi times the squared sphere radius r in feet (ft):

ΦV(lm) = 0.09290304 × Ev(lx) × 4⋅π⋅r(ft) 2

**area in square meters**

luminous flux ΦV in lumens (lm) is equal to the illuminance Ev in lux (lx) multiplied by surface area A in square meters (m2)

ΦV(lm) = Ev(lx) × A(m2)

luminous flux ΦV in lumens (lm) is equal to the illuminance Ev in lux (lx) multiplied by 4 times pi times the squared sphere radius r in meters (m)

ΦV(lm) = Ev(lx) × 4⋅π⋅r 2(m2)