**Here’s a guide on how to calculate light intensity online using some of the best free light intensity calculator websites.**

Light is the amount of visible light reflected from solid angles per unit. Candela is the main unit for describing light intensity. If you want to calculate light intensity without using software, check out this luminous intensity calculator website.

Using this site, users can calculate light intensity by providing **Luminous Flux ( )** and **Spatial Angle ( )**. On some websites, users can also change units **SI** for input parameters such as ( Foot Candle, Nox, Phot, etc.) for **Luminous Flux** and ( Radian, Degree, Gon, Turn, Sign, etc.) for **Spatial Angle**.

To calculate light intensity, this website uses the formula ** Luminous Intensity (I) = Luminous Flux (Φ)/ Spatial Angle (Ω)**. The process for calculating light intensity using this website is also quite simple. However, to help you out, I’ve also included the necessary calculation steps in the description of each website.

**Also read: 7 Sites To Calculate Area For Free**

The website also comes with many additional online calculators that you may find useful. These additional calculators include: Lux to Lumen Calculator, Watts to Lumens Calculator, and Lux to Watts calculator.

## The 5 Best Free Online Light Intensity Calculation Sites

**calculatoratoz.com****RapidTables****easycalculation.com****calculatorology.com****owenduffy.net**

## 1. calculatoratoz.com

calculatoratoz.com is a site for calculating light intensity online for free. Using this website, users can easily calculate luminous intensity in different units such as Candela, Decimal Candle, TeraCandela, PentaCandela and many more.

To calculate the light intensity, the user needs to enter the Lumen(Φ) and Solid Angle (Ω) values. Both input parameters also support various SI units such as ( LUX, NOX, Meter-Candle, Phot ) for Lumen and ( Radian, Revolution, Right Angle, etc.) for Solid Angle.

Now, follow the steps below to calculate light intensity using this website.

**How to calculate light intensity online using calculatoratoz.com:**

- Open this link:
**https://www.calculatoratoz.com/en/luminous-intensity-calculator/Calc-9915?FormulaId=9915** - After that, select the SI units of Lumen and Solid Angle.
- Next, enter the Lumen and Solid Angle values.
- Finally, specify the Luminous Intensity SI unit output and press the Calculate button to start the calculation process and see the final result.

**Additional features:**

**Steps:**This is a handy tool that shows all the steps of calculating light intensity.**Formulas:**It shows the actual formula used by this website to calculate light intensity.

This is one of the best free online light intensity calculator website where users can easily calculate light intensity.

## 2. RapidTables

RapidTables is another free online light intensity calculator site. Using this website, users can easily calculate light intensity.

To perform the calculations, this site uses Intensity ( I v ) in candela (cd) = luminous flux (Φ v ) / solid Angle ( ).

Unlike other similar websites, it uses specific SI units for input and output parameters namely Lumen for luminous flux, degree for Apex Angle, and Candela for output luminous intensity.

Now, follow the steps below to calculate light intensity using this website.

**How to calculate light intensity online using RapidTables:**

- Visit this link:
**https://www.rapidtables.com/calc/light/lumen-to-candela-calculator.html** - After that, enter the value of luminous flux and apex angle.
- Finally, click the Calculate button to see the output luminous intensity value.

This website offers many other lighting calculators such as Candela to lux calculator, Footcandles to lux calculator, Lux to Candela calculator, Lux to Watt calculator and many more.

This is an easy-to-use online luminous intensity calculator site that can calculate and show luminous intensity in Candela units.

**Also read: How to Calculate Pool Water Volume Online**

## 3. easycalculation.com

easycalculation.com is another free online light intensity calculator site. This website offers a special calculator for calculating luminous intensity in SI Candela units.

As input parameters, we need Luminous Flux (Φ) and Spatial Angle () values. According to the input parameter value, it produces an output value of Luminous Intensity. Now, follow the steps below to calculate Luminous Intensity using this website.

**How to calculate light intensity online using easycalculation.com:**

- Visit this link:
**https://www.easycalculation.com/physics/classical-physics/luminous-intensity.php** - After that, enter the Luminous Flux and Spatial Angle values manually in their respective fields.
- Finally, press the Calculate button to see the Luminous Intensity output value.

**Additional features:**

**Formulas:**This section shows the formula used by this website to calculate light intensity, namely (Luminous Intensity) I = Luminous Flux (Φ)/ Spatial Angle (Ω).**Related Calculators:**A good set of additional calculators is also provided by this website like Force, Work Calculator, Total Work, Power with Work, Class Rank Calculator and many more.

This is another online luminous intensity calculator website that anyone can use to easily calculate luminous intensity.

## 4. calculatorology.com

calculatorology.com is another free online site for calculating light intensity. This website offers several online calculators, one of which is the Lumens to candela calculator.

This calculator can calculate light intensity. Like other similar calculators, it also requires Luminous Flux and Apex angle values. After calculating the light intensity, it shows the output value in candela. Now, check the steps below.

**How to calculate light intensity online using calculatorology.com:**

- Visit this link:
**https://www.calculatorology.com/lumens-to-candela-calculator/** - After that, enter the value of luminous flux and apex angle.
- Finally, press the Calculate button to see the output value in Candela.

This website offers some additional online calculators such as Lux to Lumen Calculator, Watts to Lumens Calculator, Lumen to Lux Calculator and many more.

This is a simple and effective online luminous calculator site that anyone can use to calculate light intensity.

## 5. Ownduffy.net

Ownduffy.net is another free online light intensity calculator site. Through this website, users can not only calculate light intensity, but also calculate conical solid angle, power, light efficiency, etc.,. Now, check the steps below.

**How to calculate light intensity online using Ownduffy.net:**

- Open the following link:
**https://owenduffy.net/calc/cd2lum.htm** - After that, enter the Luminous Flux and Conanial Angle values in their respective fields.
- Next, click the Calculate button to see the output luminous intensity in candela along with the conical solid angle.

A good set of additional online calculators is also offered by it such as noise measurement uncertainty calculator, antenna wire catenary calculator, VSWR calculator and many more.

This is another good online luminous intensity calculator website which can also be used to calculate values for luminous flux density, luminous efficiency, power, etc.

That’s the best free light intensity calculator website. I hope this article helped you! Thank you for visiting and don’t forget if you find this article useful, please share it with your friends too.