CCT Calculator

Calculate correlated color temperature (CCT) from color coordinates for lighting and display applications.

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About This Tool

The CCT Calculator is a specialized online tool that computes the correlated color temperature (CCT) from chromaticity coordinates (x, y) using the McCamy approximation formula. This tool is essential for lighting designers, photographers, display engineers, and anyone working with color science to determine the color temperature of light sources in Kelvin. Simply input the x and y chromaticity coordinates (values between 0 and 1), along with optional brightness and CRI values, and get instant CCT calculation with color temperature categorization and practical recommendations.

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How to Use

Enter the x chromaticity coordinate (
0 to
in the first input field.
Enter the y chromaticity coordinate (
0 to
in the second input field.
Optionally adjust the brightness (lumens) and color rendering index (CRI) sliders.
Click the 'Calculate CCT' button to compute the correlated color temperature.
View the results showing CCT in Kelvin, temperature category, and lighting recommendations.

Frequently Asked Questions

Find Quick Answers

What is Correlated Color Temperature (CCT)?

Correlated Color Temperature (CCT) is a specification of the color appearance of a light source, measured in Kelvin (K). It indicates whether the light appears warm (lower Kelvin, e.g., 2700K) or cool (higher Kelvin, e.g., 6500K).

What are valid ranges for x and y coordinates?

Both x and y chromaticity coordinates must be between 0.0 and 1.0. Typical values for white light sources range from x: 0.25-0.45 and y: 0.25-0.45. The tool validates these ranges and shows errors if values are outside acceptable limits.

How accurate is this CCT calculator?

This calculator uses the McCamy approximation formula, which provides good accuracy for most practical applications with typical white light sources. For scientific precision, more complex models like Robertson's method may be required.

Can I use this tool for photography lighting?

Yes, photographers can use this tool to calculate the color temperature of light sources to ensure proper white balance settings. The tool provides categorization (warm, neutral, cool) that helps in selecting appropriate lighting for different scenes.

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