#66643D Color

#66643D is rgb(102, 100, 61) in RGB, hsl(57, 25%, 32%) in HSL, and about cmyk(0%, 2%, 40%, 60%) in CMYK. It has no registered color name of its own — the closest is Fatigue Green (#5B6238), very hard to tell apart at ΔE 4.67. White text is the more readable choice on this background.

#66643D

HEX#66643D

RGBrgb(102, 100, 61)

HSLhsl(57, 25%, 32%)

HSVhsv(57, 40%, 40%)

CMYKcmyk(0%, 2%, 40%, 60%)

OKLCHoklch(49.5% 0.057 105.8)

LABlab(41.81% -3.98 22.42)

LCHlch(41.81% 22.77 100.08)

What #66643D 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 #66643D, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Fatigue Green#5B6238ΔE 4.67 Gold Fusion#85754EΔE 10.32 Army Green#4B5320ΔE 11.35 French Bister(french Bistre)#856D4DΔE 11.99 Mustard Green#6E6E30ΔE 12.36 Raw Umber#826644ΔE 12.74

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

#66643D Channel Values

How #66643D 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 100 · B 61	8-bit channels as sent to the display
HSL	H 57° · S 25% · L 32%	Easiest model for building lighter and darker variants
HSV	H 57° · S 40% · V 40%	Matches the picker in most design tools
CMYK	C 0% · M 2% · Y 40% · K 60%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	6.08:1 vs white · 3.46:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66643D 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 text6.08:1AA normal AA large AAA normal

Fails AABlack text3.46:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66643D in the contrast checker.

Colors That Go With #66643D

Pairings derived from color-wheel relationships. The complementary color sits opposite #66643D; 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 #66643D

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 #66643D.

How #66643D 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#66643D

Protanopia#64643D

Protanomaly#65643D

Deuteranopia#65653D

Deuteranomaly#65643D

Tritanopia#6A6060

Tritanomaly#686254

Achromatopsia#626262

Test a full palette in the color blindness simulator.

Using #66643D in Code

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

CSS custom property--color-66643d: #66643D;

CSS backgroundbackground-color: #66643D;

Tailwind configcolors: { 'color-66643d': '#66643D' }

SwiftUIColor(red: 0.400, green: 0.392, blue: 0.239)

Android XML<color name="color_66643d">#66643D</color>

SVG fillfill="#66643D"

More Yellow Colors

#66643D sits in the yellow family. These are its neighbours across that family's full range, each with its own breakdown.

181807 fffff5 1b1404 fffff0 1f1f00 ffffeb 242400 ffffe5 2a2913 ffffe0 2b2003 ffffd6 573a00 856514 b0a94f cc9900 e0e000 edeae0 f2f1e3 f8f3c9 fcfce8 ffcc00 fff000 ffff0f

#66643D Frequently Asked Questions

What color is #66643D?

#66643D is a dark yellow — rgb(102, 100, 61) in RGB and hsl(57, 25%, 32%) in HSL. It carries no registered color name of its own; the closest named color is Fatigue Green (#5B6238), which is very hard to tell apart at a CIE76 distance of 4.67.

What is the RGB value of #66643D?

#66643D is rgb(102, 100, 61) — red 102, green 100, and blue 61 on the 0-255 scale.

What is the CMYK value of #66643D?

#66643D converts to approximately cmyk(0%, 2%, 40%, 60%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66643D be black or white?

White text is the more readable choice. #66643D scores 6.08:1 against white and 3.46:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66643D as a CSS color keyword?

No. #66643D 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 darkolivegreen (#556B2F) at a CIE76 distance of 14.73, which is visibly different.

Open #66643D 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.