# Lumens to lux calculator

## Lumens to lux calculator

We are offering  Luminous flux in lumens (lm) to illuminance in lux (lx) calculator to make your calculations easy, check now! All you need to do is to enter the luminous flux in lumens and select the area unit type, enter radius in meters for the spherical light source or the total surface area which is measured in square meters for any light source and hit the = button to obtain the illuminance in lux.

 Enter luminous flux in lumens: lm Select area unit type: Area in square feet Area in square meters Enter spherical radius: Or enter surface area: Illuminance result in lux: lx

## Formula for Lumens to lux calculation

### Calculation with the area in square feet

The illuminance Ev which is measured in lux (lx) is apparently equal to 10.76391 times the value of luminous flux ΦV in lumens (lm) and finally divided by the surface area A measured in square feet (ft2).

Ev(lx) = 10.76391 × ΦV(lm) / A(ft2)

The illuminance Ev measured in lux (lx) is apparently equal to 10.76391 times the value of luminous flux ΦV in lumens (lm) which is divided by 4 times the value of pi, further multiplied by the squared sphere radius r in feet (ft).

Ev(lx) = 10.76391 × ΦV(lm) / (4⋅π⋅r(ft)2)

### Calculation with area in square meters

The illuminance Ev in lux (lx) is apparently equal to the value of luminous flux ΦV in lumens (lm) which is further divided by the surface area A measured in square meters (m2).

Ev(lx) = ΦV(lm) / A(m2)

The illuminance Ev in lux (lx) is apparently equal to the luminous flux ΦV which is measured in lumens (lm) and divided by 4 times the value of pi multiplied by the squared sphere radius r measured in meters (m).

Ev(lx) = ΦV(lm) / (4⋅π⋅r 2(m2))