How to convert illuminance in lux (lx) to luminous flux in lumens (lm).

You can calculate lumens from lux and surface area. Lux and lumen units represent different quantities, so you can't convert lux to lumens.

- Lux to lumens calculation with area in square feet
- Lux to lumens calculation with area in square meters

## Lux to lumens calculation formula

### Lux to lumens calculation with area in square feet

The luminous flux *Φ*_{V} in lumens (lm) is equal to 0.09290304 times the illuminance *E*_{v} in
lux (lx) times the surface area *A* in square feet (ft^{2}):

*Φ*_{V(lm)} = 0.09290304* *×* E*_{v(lx)}* *×* A*_{(ft}2_{)}

For a spherical light source, the area A is equal to 4 times pi times the squared sphere radius:

* A* = 4⋅π⋅*r *^{2}

So the luminous flux *Φ*_{V} in lumens (lm) is equal to 0.09290304 times the illuminance *E*_{v} in
lux (lx) times 4 times pi times the squared sphere radius r in feet (ft):

*Φ*_{V(lm)} = 0.09290304* *×* E*_{v(lx)}* *×* *4⋅π⋅*r*_{(ft)}* *^{2}

So

lumens = 0.09290304* *×*
*lux × (square feet)

or

lm = 0.09290304* *×*
*lx × ft^{2}

### Lux to lumens calculation with area in square meters

The luminous flux *Φ*_{V}
in lumens (lm) is equal to the illuminance *E*_{v} in
lux (lx) times the surface area *A* in square meters (m^{2}):

*Φ*_{V(lm)} =
*E*_{v(lx)}* *×*
A*_{(m}2_{)}

For a spherical light source, the area A is equal to 4 times pi times the squared sphere radius:

* A* = 4⋅π⋅*r *^{2}

So the luminous flux *Φ*_{V}
in lumens (lm) is equal to the illuminance *E*_{v} in lux (lx) times 4 times pi times the squared sphere radius r in meters (m):

*Φ*_{V(lm)} = *E*_{v(lx)}* *× 4⋅π⋅*r *^{2}

So

lumens = lux × (square meters)

or

lm = lx × m^{2}

##### Example

What is the luminous flux on a surface of 4 square meters and illuminance of 500 lux?

*Φ*_{V(lm)} = 500 lux × 4 m^{2} = 2000 lm

Currently, we have around 5611 calculators, conversion tables and usefull online tools and software features for students, teaching and teachers, designers and simply for everyone.

You can find at this page financial calculators, mortgage calculators, calculators for loans, calculators for auto loan and lease calculators, interest calculators, payment calculators, retirement calculators, amortization calculators, investment calculators, inflation calculators, finance calculators, income tax calculators, compound interest calculators, salary calculator, interest rate calculator, sales tax calculator, fitness & health calculators, bmi calculator, calorie calculators, body fat calculator, bmr calculator, ideal weight calculator, pace calculator, pregnancy calculator, pregnancy conception calculator, due date calculator, math calculators, scientific calculator, fraction calculator, percentage calculators, random number generator, triangle calculator, standard deviation calculator, other calculators, age calculator, date calculator, time calculator, hours calculator, gpa calculator, grade calculator, concrete calculator, subnet calculator, password generator conversion calculator and many other tools and for text editing and formating, downloading videos from Facebok (we built one of the most famous Facebook video downloader online tools). We also provide you online downloanders for YouTube, Linkedin, Instagram, Twitter, Snapchat, TikTok and other social media sites (please note we does not host any videos on its servers. All videos that you download are downloaded from Facebook's, YouTube's, Linkedin's, Instagram's, Twitter's, Snapchat's, TikTok's CDNs. We also specialise on keyboard shortcuts, ALT codes for Mac, Windows and Linux and other usefull hints and tools (how to write emoji online etc.)

There are many very usefull online free tools and we would be happy if you share our page to others or send us any suggestions for other tools which will come on your mind. Also in case you find any of our tools that it does not work properly or need a better translation - please let us know. Our tools will make your life easier or simply help you to do your work or duties faster and in more effective way.

These below are the most commonly used by many users all over the world.

- Free online calculators and tools
- Time zones/Clocks/Dates calculators
- Free Online Units Conversion Calculators
- Free online web design tools
- Free online electricity & electronics tools
- Mathematics
- Online Tools
- Text Tools
- PDF Tools
- Code
- Ecology
- Others
- Free online downloaders for social media
- Free online electrical calculators and tools
- Free online financial calculators and tools
- Free online grade calculators and tools
- Free online lighting calculators and tools
- Free online math calculators and tools
- Free online wire calculators and tools
- Free online baby calculators and tools
- Free online body calculators and tools
- Candela to lumens free online calculation
- Candela to lumens free online calculator
- Candela to lux free online calculation
- Candela to lux free online calculator
- Footcandles to lux free online calculator
- Lumens to candela free online calculation
- Lumens to candela free online calculator
- Lumens to lux free online calculation
- Lumens to lux free online calculator
- Lumens to millicandela free online calculator
- Lumens to watts free online calculation
- Lumens to watts free online calculator
- Lux to candela free online calculation
- Lux to candela free online calculator
- Lux to footcandles free online calculator
- Lux to lumens free online calculation
- Lux to lumens free online calculator
- Lux to watts free online calculation
- Lux to watts free online calculator
- Millicandela to lumens free online calculator
- Watts to lumens free online calculation
- Watts to lumens free online calculator
- Watts to lux free online calculation
- Watts to lux free online calculator

And we are still developing more. Our goal is to become the one-stop, go-to site for people who need to make quick calculations or who need to find quick answer for basic conversions.

Additionally, we believe the internet should be a source of free information. Therefore, all of our tools and services are completely free, with no registration required. We coded and developed each calculator individually and put each one through strict, comprehensive testing. However, please inform us if you notice even the slightest error – your input is extremely valuable to us. While most calculators on Justfreetools.com are designed to be universally applicable for worldwide usage, some are for specific countries only.