#666600 Color

#666600 is rgb(102, 102, 0) in RGB, hsl(60, 100%, 20%) in HSL, and about cmyk(0%, 0%, 100%, 60%) in CMYK. It has no registered color name of its own — the closest is Olive (#808000), visibly different at ΔE 13.25. White text is the more readable choice on this background.

#666600

HEX#666600

RGBrgb(102, 102, 0)

HSLhsl(60, 100%, 20%)

HSVhsv(60, 100%, 40%)

CMYKcmyk(0%, 0%, 100%, 60%)

OKLCHoklch(49.4% 0.108 109.8)

LABlab(41.97% -8.04 47.66)

LCHlch(41.97% 48.33 99.57)

What #666600 Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #666600, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Olive#808000ΔE 13.25 Antique Bronze#665D1EΔE 13.29 Spanish Bister(spanish Bistre)#807532ΔE 13.65 Old Moss Green#867E36ΔE 13.89 Mustard Green#6E6E30ΔE 14.23 Xander#44500CΔE 16.76

Browse the full index of named colors A-Z or every yellow in the library.

#666600 Channel Values

How #666600 breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 102 · G 102 · B 0	8-bit channels as sent to the display
HSL	H 60° · S 100% · L 20%	Easiest model for building lighter and darker variants
HSV	H 60° · S 100% · V 40%	Matches the picker in most design tools
CMYK	C 0% · M 0% · Y 100% · K 60%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	6.06:1 vs white · 3.47:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #666600 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text6.06:1AA normal AA large AAA normal

Fails AABlack text3.47:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #666600 in the contrast checker.

Colors That Go With #666600

Pairings derived from color-wheel relationships. The complementary color sits opposite #666600; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of #666600

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #666600.

How #666600 Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#666600

Protanopia#666600

Protanomaly#666600

Deuteranopia#666600

Deuteranomaly#666600

Tritanopia#6C6060

Tritanomaly#6A624B

Achromatopsia#626262

Test a full palette in the color blindness simulator.

Using #666600 in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-666600: #666600;

CSS backgroundbackground-color: #666600;

Tailwind configcolors: { 'color-666600': '#666600' }

SwiftUIColor(red: 0.400, green: 0.400, blue: 0.000)

Android XML<color name="color_666600">#666600</color>

SVG fillfill="#666600"

More Yellow Colors

#666600 sits in the yellow family. These are its neighbours across that family's full range, each with its own breakdown.

666633 665d1e 6c541e 664d0f 6c630e 624a0f 6d6207 616100 6e6e30 5f5c2b 6f5106 5c4305 979244 bda000 d1bc00 e5dc7b efdfbb f5efe0 faf6d6 fdff00 ffde24 fff9e0 ffff6b 383000

#666600 Frequently Asked Questions

What color is #666600?

#666600 is a dark yellow — rgb(102, 102, 0) in RGB and hsl(60, 100%, 20%) in HSL. It carries no registered color name of its own; the closest named color is Olive (#808000), which is visibly different at a CIE76 distance of 13.25.

What is the RGB value of #666600?

#666600 is rgb(102, 102, 0) — red 102, green 102, and blue 0 on the 0-255 scale.

What is the CMYK value of #666600?

#666600 converts to approximately cmyk(0%, 0%, 100%, 60%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #666600 be black or white?

White text is the more readable choice. #666600 scores 6.06:1 against white and 3.47:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #666600 as a CSS color keyword?

No. #666600 is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is olive (#808000) at a CIE76 distance of 13.25, which is visibly different.

Open #666600 in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

Keep exploring: every yellow in the color library, the guide to shades of yellow, or the full color library.