Color temperature calculator
Convert a Kelvin color temperature to an RGB and hex preview, see where it falls from warm to cool, and compare it with the D65 daylight standard.
Color temperature result
Approximate color
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- RGB
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- Hex
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- Distance from D65 (6,500K)
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Reference color temperatures
| Source | Temperature |
|---|---|
| Candlelight | 1,800 to 2,000K |
| Incandescent bulb | 2,700K |
| Warm white LED | 3,000K |
| Neutral white | 4,000K |
| Daylight (D65) | 6,500K |
| Overcast sky | 7,000 to 8,000K |
| Blue sky | 10,000 to 15,000K |
How it works
Color temperature describes the chromaticity of a light source or display white point in Kelvin, from warm reddish orange (1,800 to 3,000K) through neutral white (5,000 to 6,500K) to cool blue (8,000K and up). D65, at 6,500K, is the reference white point for sRGB, Adobe RGB and most digital display color spaces.
- Enter a Kelvin value
Or pick a common temperature from the list.
- Read the preview
The swatch, RGB and hex update as you type.
- Compare with D65
See how far your value sits from the 6,500K display standard.
Kelvin to RGB and why higher K looks bluer
The preview uses the Tanner Helland algorithm, a piecewise approximation fitted to blackbody radiation data. Below 6,600K red stays at 255 and green is derived from a logarithmic curve; above 6,600K all channels follow power-law curves. The result is an sRGB approximation useful for previews, not a photometrically exact conversion.
The Kelvin scale runs opposite to everyday color words: a blackbody heated to 3,000K glows orange-red, so we call it "warm", while 10,000K glows blue-white and reads as "cool". A higher Kelvin number means cooler, bluer light, which is the opposite of how "warm" and "cool" are used for paint or clothing colors.
A display's on-screen setting rarely matches its actual white point
A panel's native white point is set by its backlight or emitters, which age and drift. Most consumer panels ship at 7,000 to 8,000K out of the box to look brighter in showrooms. Verify a display's real white point with a colorimeter rather than trusting its on-screen color temperature label.
Frequently asked questions
What color temperature should my monitor be set to?
For accurate color work aligned with sRGB and Display P3, set your monitor to D65 (6,500K). Many monitors default near 6,500K in "Standard" mode but also ship presets at 5,000K (graphic arts) or 9,300K (a native cool-blue LCD default). For nighttime use, reducing color temperature to 4,000 to 5,000K can reduce blue light and perceived glare, though it moves away from color-accurate calibration.
Why does a higher Kelvin value produce a bluer appearance?
Color temperature is defined by blackbody radiation, the color emitted by a heated object. At 2,700K (an incandescent bulb) a blackbody glows reddish orange. At 6,500K it approaches white with a slight blue cast matching open-sky daylight. At 10,000K it is distinctly blue. The term "warm" in everyday language refers to the feeling of incandescent light, not its Kelvin number.
How do I convert color temperature in Kelvin to an RGB value for rendering?
The Tanner Helland algorithm gives approximate RGB values from Kelvin using piecewise equations fitted to CIE blackbody data. Below 6,600K, red stays at 255 while green and blue are derived from logarithmic curves. Above 6,600K, all channels use power-law approximations. The result is an sRGB approximation, not photometrically exact, useful for UI rendering and lighting previews.
What is D65 and why is it used as the standard white point?
D65 is the CIE standard illuminant representing average northern hemisphere midday daylight at about 6,500K. Its spectral power distribution was measured from real sky samples across multiple locations and seasons. D65 was chosen as the sRGB, Adobe RGB and Rec. 709 white point because it matches the ambient light most consumer content is viewed in, keeping displayed colors perceptually neutral.
Does night mode or blue light reduction actually harm color accuracy?
Yes. Night mode, night shift, or a monitor's "warm" preset shift the white point to 3,500 to 5,000K, well away from D65. Color-critical work done under these settings looks too warm once viewed on a calibrated display or in print. These modes suit comfort during low-light evening use; disable them before photo editing, video grading, or any task needing accurate color.