#66E40C Color

#66E40C is rgb(102, 228, 12) in RGB, hsl(95, 90%, 47%) in HSL, and about cmyk(55%, 0%, 95%, 11%) in CMYK. It has no registered color name of its own — the closest is Spring Frost (#87FF2A), visibly different at ΔE 10.06. Black text is the more readable choice on this background.

#66E40C

HEX#66E40C

RGBrgb(102, 228, 12)

HSLhsl(95, 90%, 47%)

HSVhsv(95, 95%, 89%)

CMYKcmyk(55%, 0%, 95%, 11%)

OKLCHoklch(81.4% 0.247 137.4)

LABlab(81.07% -59.29 75.56)

LCHlch(81.07% 96.04 128.12)

What #66E40C 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 #66E40C, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Spring Frost#87FF2AΔE 10.06 SGBUS Green#55DD33ΔE 10.33 Lawn Green#7CFC00ΔE 11.13 Chartreuse#7FFF00ΔE 12.42 French Lime#9EFD38ΔE 13.29 Bright Green#66FF00ΔE 13.8

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

#66E40C Channel Values

How #66E40C 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 228 · B 12	8-bit channels as sent to the display
HSL	H 95° · S 90% · L 47%	Easiest model for building lighter and darker variants
HSV	H 95° · S 95% · V 89%	Matches the picker in most design tools
CMYK	C 55% · M 0% · Y 95% · K 11%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.66:1 vs white · 12.67:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66E40C 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 text1.66:1AA normal AA large AAA normal

TextBlack text12.67:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66E40C in the contrast checker.

Colors That Go With #66E40C

Pairings derived from color-wheel relationships. The complementary color sits opposite #66E40C; 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 #66E40C

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 #66E40C.

How #66E40C 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#66E40C

Protanopia#D5D513

Protanomaly#B3DB11

Deuteranopia#C6C628

Deuteranomaly#A8D320

Tritanopia#84D7D7

Tritanomaly#79DCAB

Achromatopsia#C9C9C9

Test a full palette in the color blindness simulator.

Using #66E40C in Code

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

CSS custom property--color-66e40c: #66E40C;

CSS backgroundbackground-color: #66E40C;

Tailwind configcolors: { 'color-66e40c': '#66E40C' }

SwiftUIColor(red: 0.400, green: 0.894, blue: 0.047)

Android XML<color name="color_66e40c">#66E40C</color>

SVG fillfill="#66E40C"

More Green Colors

#66E40C sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200 fdfff5 001f00 f7fee7 002400 f7fbf5 002c22 f5fffa 002e00 f5fff5 003300 f0fff0 008000 00db87 0d542b 20483f 33cc66 46c399 5ea500 728639 91e0b7 a3f5d8 bcd7bc d1ffed

#66E40C Frequently Asked Questions

What color is #66E40C?

#66E40C is a mid-tone green — rgb(102, 228, 12) in RGB and hsl(95, 90%, 47%) in HSL. It carries no registered color name of its own; the closest named color is Spring Frost (#87FF2A), which is visibly different at a CIE76 distance of 10.06.

What is the RGB value of #66E40C?

#66E40C is rgb(102, 228, 12) — red 102, green 228, and blue 12 on the 0-255 scale.

What is the CMYK value of #66E40C?

#66E40C converts to approximately cmyk(55%, 0%, 95%, 11%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66E40C be black or white?

Black text is the more readable choice. #66E40C scores 1.66:1 against white and 12.67:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66E40C as a CSS color keyword?

No. #66E40C 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 lawngreen (#7CFC00) at a CIE76 distance of 11.13, which is visibly different.

Open #66E40C 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 green in the color library, the guide to shades of green, or the full color library.