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#66A366 Color

#66A366 is rgb(102, 163, 102) in RGB, hsl(120, 25%, 52%) in HSL, and about cmyk(37%, 0%, 37%, 36%) in CMYK. It has no registered color name of its own — the closest is Forest Green (Crayola) (#5FA777), clearly related but distinguishable side by side at ΔE 7.95. Black text is the more readable choice on this background.

#66A366
HEX#66A366
RGBrgb(102, 163, 102)
HSLhsl(120, 25%, 52%)
HSVhsv(120, 37%, 64%)
CMYKcmyk(37%, 0%, 37%, 36%)
OKLCHoklch(65.8% 0.109 144.2)
LABlab(61.67% -30.18 25.26)
LCHlch(61.67% 39.36 140.07)

What #66A366 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 #66A366, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Forest Green (Crayola)#5FA777ΔE 7.95Shiny Shamrock#5FA778ΔE 8.43Middle Green#4D8C57ΔE 9.36Asparagus#7BA05BΔE 9.93Russian Green#679267ΔE 12.06May Green#4C9141ΔE 13.08

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

#66A366 Channel Values

How #66A366 breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

ModelChannelsNotes
RGBR 102 · G 163 · B 1028-bit channels as sent to the display
HSLH 120° · S 25% · L 52%Easiest model for building lighter and darker variants
HSVH 120° · S 37% · V 64%Matches the picker in most design tools
CMYKC 37% · M 0% · Y 37% · K 36%Approximate ink mix; confirm with an ICC profile before printing
Luminance3:1 vs white · 7:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66A366 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.

Fails AAWhite text3:1AA normal AA large AAA normal
TextBlack text7:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66A366 in the contrast checker.

Colors That Go With #66A366

Pairings derived from color-wheel relationships. The complementary color sits opposite #66A366; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#66A366
Complementary
#A366A3
Analogous
#85A366
Analogous
#66A385
Triadic
#6666A3
Triadic
#A36666
Split comp.
#8566A3
Split comp.
#A36685

Tints & Shades of #66A366

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

#7CB17C
#8FBC8F
#A6C9A6
#B9D5B9
#CFE2CF
#E2EEE2

Shades

#568F56
#497949
#3B633B
#305030
#223922
#152315

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66A366.

How #66A366 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#66A366
Protanopia#9B9B66
Protanomaly#899E66
Deuteranopia#929268
Deuteranomaly#839967
Tritanopia#709D9D
Tritanomaly#6C9F8A
Achromatopsia#959595

Test a full palette in the color blindness simulator.

Using #66A366 in Code

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

CSS custom property--color-66a366: #66A366;
CSS backgroundbackground-color: #66A366;
Tailwind configcolors: { 'color-66a366': '#66A366' }
SwiftUIColor(red: 0.400, green: 0.639, blue: 0.400)
Android XML<color name="color_66a366">#66A366</color>
SVG fillfill="#66A366"

More Green Colors

#66A366 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200fdfff5001f00f7fee7002400f7fbf5002c22f5fffa002e00f5fff5003300f0fff000800000db870d542b20483f33cc6646c3995ea50072863991e0b7a3f5d8bcd7bcd1ffed

#66A366 Frequently Asked Questions

What color is #66A366?

#66A366 is a mid-tone green — rgb(102, 163, 102) in RGB and hsl(120, 25%, 52%) in HSL. It carries no registered color name of its own; the closest named color is Forest Green (Crayola) (#5FA777), which is clearly related but distinguishable side by side at a CIE76 distance of 7.95.

What is the RGB value of #66A366?

#66A366 is rgb(102, 163, 102) — red 102, green 163, and blue 102 on the 0-255 scale.

What is the CMYK value of #66A366?

#66A366 converts to approximately cmyk(37%, 0%, 37%, 36%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66A366 be black or white?

Black text is the more readable choice. #66A366 scores 3:1 against white and 7:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66A366 as a CSS color keyword?

No. #66A366 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 seagreen (#2E8B57) at a CIE76 distance of 13.96, which is visibly different.

Open #66A366 in a Tool

Hex to RGBHex to HSLHex to CMYKHex to OKLCHHex to PantoneBuild a paletteMake a gradient

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