Watts To Candlepower Calculator


In the realm of lighting, understanding the conversion between watts and candlepower is essential for choosing the right illumination for various applications. A watts to candlepower calculator provides a convenient tool to perform these conversions accurately. Let’s explore how to use one effectively.

How to Use:

Using a watts to candlepower calculator is straightforward. Simply input the wattage of the light source, and the calculator will provide the corresponding candlepower output. This allows users to gauge the intensity of light emitted by different bulbs or fixtures accurately.


The formula used for converting watts to candlepower is:

This formula takes into account the luminous efficiency of the light source, represented by the constant 683, and the surface area over which the light is distributed.

Example Solve:

Let’s say we have a light bulb with a power rating of 60 watts and a surface area of 4 square inches. Using the formula mentioned above:

Therefore, the candlepower output of the 60-watt bulb over a surface area of 4 square inches is 10245 candlepower.


Q: Can I use this calculator for all types of light sources?
A: Yes, this calculator is versatile and can be used for various types of light sources, including incandescent bulbs, fluorescent lamps, and LED fixtures.

Q: Why is surface area important in the calculation?
A: Surface area determines the spread of light emitted by the source. A larger surface area means the light is distributed over a wider area, resulting in lower candlepower per unit area.

Q: Is candlepower the same as luminous intensity?
A: Yes, candlepower is a measure of luminous intensity, representing the amount of light emitted in a particular direction.


A watts to candlepower calculator is a valuable tool for anyone involved in lighting design or selection. By accurately converting between watts and candlepower, users can make informed decisions about the brightness and intensity of lighting solutions for various applications.

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