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Math & Numbers

Luminous Intensity Converter (cd / mcd / candlepower)

· Last updated：2026-08-01

Convert luminous intensity between candela (cd, SI base, = 1/683 W/sr at 540 THz), millicandela (1 = 0.001 cd), and candlepower (1 = 0.981 cd, obsolete standard candle). Converts via candela to the target unit and lists the equivalent value in all three units for reference. Reference values: indicator LED ≈ 5–20 mcd, flashlight ≈ 100–1000 cd, car headlight high beam ≈ 75000 cd.

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Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert non-negative luminous intensity values between candela (cd), millicandela (mcd), and candlepower (cp). Enter a value, select the input and output units, choose decimal places, and receive the converted value plus equivalent values in all three units.

When to use

  • Convert LED specifications from millicandela to candela.
  • Compare flashlight or lighting values reported in candela and candlepower.
  • Check equivalent luminous intensity values across all supported units.

How it works

  1. 1Enter a non-negative luminous intensity value.
  2. 2Select the input unit: candela, millicandela, or candlepower.
  3. 3Select the output unit and set decimal places from 0 to 10.
  4. 4The converter calculates the result through candela and lists the candela, millicandela, and candlepower equivalents.

Use cases

  • Translate indicator LED ratings such as 5–20 mcd into candela.
  • Convert flashlight specifications from candlepower to candela or millicandela.
  • Review photometry values with all three unit equivalents shown together.

Examples

1. Indicator LED: 20 mcd to candela

Electronics designer

Background

An electronics designer has an indicator LED specification listed as 20 millicandela.

Problem

Convert the LED intensity to candela while retaining the equivalent values for reference.

How to use

Enter 20 as the value, select millicandela as the input unit, candela as the output unit, and use 6 decimal places.

Input unit: millicandela; Value: 20; Output unit: candela; Decimal places: 6

Outcome

The result is 0.02 candela. The full equivalents are 0.02 cd, 20 mcd, and 0.020387 cp.

2. Flashlight: 500 candlepower to candela

Lighting product reviewer

Background

A flashlight specification uses the older candlepower unit, with a stated intensity of 500 cp.

Problem

Express the specification in candela and millicandela for comparison.

How to use

Enter 500 as the value, select candlepower as the input unit, candela as the output unit, and set the required decimal places.

FAQ

Which luminous intensity units are supported?

The converter supports candela (cd), millicandela (mcd), and candlepower (cp).

What is the conversion from millicandela to candela?

One millicandela equals 0.001 candela.

What is the conversion from candlepower to candela?

One candlepower equals 0.981 candela.

Can I enter a negative value?

No. The value must be non-negative.

How many decimal places can I display?

You can choose from 0 to 10 decimal places.

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Input unit: candlepower; Value: 500; Output unit: candela; Decimal places: 6

Outcome

The result is 490.5 candela, equivalent to 490500 millicandela and 500 candlepower.