{ Color Temperature Converter }

// convert kelvin to rgb hex for lighting and UI

Convert color temperature in Kelvin to approximate RGB hex values for lighting, photography, UI design, and white balance calibration. Free browser-based tool.

K
Daylight
6500 K Daylight
// COLOR VALUES
HEX #FFE4C4
RGB rgb(255, 228, 206)
R 255
G 228
B 206
CSS background: #FFE4C4;
// TEMPERATURE SCALE
1000K 5500K 10000K

HOW TO USE

  1. 01
    Enter Kelvin Value

    Drag the slider or type a value between 1000K and 40000K in the input field.

  2. 02
    Use Presets

    Click any preset button to jump to common lighting conditions like candle, daylight, or overcast sky.

  3. 03
    Copy Your Values

    Copy HEX, RGB, or CSS values individually, or use Copy All to get everything at once.

FEATURES

Kelvin → HEX Kelvin → RGB Live Preview 9 Presets CSS Output Visual Scale

USE CASES

  • 🎨 UI design — match background tints to lighting mood
  • 📸 Photography — understand white balance settings
  • 💡 Lighting design — spec LED color temperatures
  • 🎬 Video production — set correct white balance
  • 🖥️ Display calibration — match screen to ambient light

WHAT IS THIS?

Color temperature describes the color of a light source using the Kelvin (K) scale. Lower values (1000K–3000K) produce warm, reddish-orange light; higher values (6000K–10000K) produce cool, bluish-white light. This converter uses the Tanner Helland algorithm to approximate the RGB color that corresponds to any given Kelvin value.

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FREQUENTLY ASKED QUESTIONS

What is color temperature in Kelvin?

Color temperature is a way to describe the hue of a light source by comparing it to the color emitted by a black body radiator at a given temperature in Kelvin. It ranges from warm (red-orange, ~1000K) to cool (blue-white, ~10000K+).

What Kelvin value is "natural" daylight?

Average daylight at noon is approximately 5500K–6500K. Overcast sky tends toward 7000K–8000K. Clear blue sky can reach 9000K–12000K. For most photography and display work, 6500K (D65) is the standard reference white point.

How accurate is the Kelvin-to-RGB conversion?

This tool uses the Tanner Helland algorithm, which is an approximation based on curve fitting to measured blackbody radiation data. It's accurate to within about 2 RGB units across most of the visible range (1000K–40000K), which is sufficient for visual design and lighting estimation.

What Kelvin value should I use for web design?

For neutral UI backgrounds, 6500K (D65) is the standard screen white point used by most monitors and design tools. For warm/cozy interfaces, 3000K–4000K values work well. For clean, clinical aesthetics, 6500K–8000K tones are common.

What is the difference between warm and cool white light?

Warm white (2700K–3500K) has a yellowish-orange tint, similar to incandescent bulbs. It feels cozy and relaxing. Cool white (4000K–5000K) is more neutral and crisp. Daylight (5500K–6500K) is bluish-white and promotes alertness. The higher the Kelvin, the "cooler" (bluer) the light appears.

Can I use color temperature values in CSS?

Yes — this tool provides the HEX and RGB equivalents you can directly paste into CSS. For example, a 3200K tungsten tone converts to approximately #FFB46B, which you can use as a background-color, border-color, or text-shadow tint to mimic warm lighting in your UI.

What does 6500K look like?

6500K (D65) appears as a nearly pure white with a very slight blue tint. It's the standard white point for most monitors, television broadcasts, and sRGB color space. At this temperature, white objects appear "true white" under ideal viewing conditions.

What is the maximum useful Kelvin range?

For practical lighting design, 1000K–10000K covers virtually all real-world light sources. Beyond 10000K (clear sky, UV-heavy sources), the RGB values converge toward pure blue-white. This tool supports up to 40000K for completeness, though values above 10000K change very gradually.

What Is a Color Temperature Converter?

A color temperature converter translates a light source's Kelvin (K) value into the approximate RGB color that human eyes perceive when illuminated by that light. This is useful for designers, photographers, videographers, lighting engineers, and developers who need to match digital colors to real-world light sources.

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Understanding the Kelvin Scale

The Kelvin scale, named after physicist Lord Kelvin, is a unit of thermodynamic temperature. In lighting, it describes what color a "perfect black body" would emit at that temperature. Counterintuitively, "warm" light (the orange-red glow of candles and incandescent bulbs) has a lower Kelvin value, while "cool" light (blue-white daylight or overcast sky) has a higher Kelvin value.

Here are the key reference points on the Kelvin scale for common light sources:

How This Tool Calculates RGB from Kelvin

This converter uses the Tanner Helland algorithm, a widely-used approximation method that fits mathematical curves to measured blackbody radiation data. The algorithm works in three phases:

  1. Red channel: Below 6600K, red is always 255. Above 6600K, it decreases following a power curve.
  2. Green channel: Below 6600K, green increases logarithmically. Above 6600K, it decreases following a power curve.
  3. Blue channel: Below 2000K, blue is 0. Between 2000K and 6600K, it increases logarithmically. Above 6600K, blue is always 255.

The result is accurate to within roughly 2 RGB units across the 1000K–40000K range — more than sufficient for visual design, UI work, and lighting specification.

Color Temperature in Photography and Videography

White balance is the process of removing unrealistic color casts from photos and videos by telling the camera what "true white" looks like under the current lighting. Camera white balance settings are specified in Kelvin. If you shoot under 3200K tungsten lights and set your camera to 6500K, the image will appear very blue. Match the camera's Kelvin setting to the actual light source for neutral, accurate colors.

Common camera white balance presets and their approximate Kelvin values:

Color Temperature in UI and Web Design

Understanding color temperature helps UI designers create more cohesive, emotionally resonant interfaces. Warm-toned backgrounds (3000K–4000K equivalents) feel cozy, inviting, and human — ideal for lifestyle apps, food platforms, and wellness products. Cool-toned palettes (6500K–9000K) feel clean, technical, and authoritative — common in fintech, healthcare, and productivity tools.

When designing for dark mode interfaces, adding a subtle warm tint (around 3500K–4500K equivalent) to background grays reduces eye strain during nighttime use. Many OLED displays automatically shift toward warmer tones in Night Shift or Night Mode features.

Color Temperature in LED Lighting Specification

When specifying LED lighting for architectural, retail, or residential projects, color temperature (CCT — Correlated Color Temperature) is one of the most important parameters. Different spaces call for different CCT values:

Why D65 (6500K) Is the Universal Standard

D65 refers to CIE Standard Illuminant D65, which represents average noon daylight in Europe at approximately 6500K. It was adopted as the standard white point for the sRGB color space (used by virtually all computer monitors), HDTV, and most digital imaging standards. When you calibrate a monitor to D65, colors displayed on screen closely match how printed materials appear under standard lighting conditions — critical for print design, color grading, and product photography.

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