#666666 Color

#666666 is rgb(102, 102, 102) in RGB, hsl(0, 0%, 40%) in HSL, and about cmyk(0%, 0%, 0%, 60%) in CMYK. It has no registered color name of its own — the closest is Granite Gray (#676767), indistinguishable to the eye at ΔE 0.41. White text is the more readable choice on this background.

#666666

HEX#666666

RGBrgb(102, 102, 102)

HSLhsl(0, 0%, 40%)

HSVhsv(0, 0%, 40%)

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

OKLCHoklch(51% 0 0)

LABlab(43.19% -0.00 0.00)

LCHlch(43.19% 0.00 0.00)

What #666666 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 #666666, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Granite Gray#676767ΔE 0.41 Dim Gray#696969ΔE 1.22 Nickel#727472ΔE 5.59 Sonic Silver#757575ΔE 6.05 Iron Gray#555D61ΔE 6.07 Davy's Gray#555555ΔE 7.05

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

#666666 Channel Values

How #666666 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 102	8-bit channels as sent to the display
HSL	H 0° · S 0% · L 40%	Easiest model for building lighter and darker variants
HSV	H 0° · S 0% · V 40%	Matches the picker in most design tools
CMYK	C 0% · M 0% · Y 0% · K 60%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	5.74:1 vs white · 3.66:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #666666 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 text5.74:1AA normal AA large AAA normal

Fails AABlack text3.66:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #666666 in the contrast checker.

Colors That Go With #666666

Pairings derived from color-wheel relationships. The complementary color sits opposite #666666; 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 #666666

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 #666666.

How #666666 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#666666

Protanopia#666666

Protanomaly#666666

Deuteranopia#666666

Deuteranomaly#666666

Tritanopia#666666

Tritanomaly#666666

Achromatopsia#666666

Test a full palette in the color blindness simulator.

Using #666666 in Code

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

CSS custom property--color-666666: #666666;

CSS backgroundbackground-color: #666666;

Tailwind configcolors: { 'color-666666': '#666666' }

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

Android XML<color name="color_666666">#666666</color>

SVG fillfill="#666666"

More Gray Colors

#666666 sits in the gray family. These are its neighbours across that family's full range, each with its own breakdown.

676767 655b55 696969 636363 6b6b6b 616161 6b6e70 5e5e5e 6e6e6e 5c5c5c 71717b 575757 737373 807473 8a7f80 989898 a9a9a9 b5b5b5 c4c4c4 d6d3d1 2b2b2b 404040 4d4d4d 555d50

#666666 Frequently Asked Questions

What color is #666666?

#666666 is a mid-tone gray — rgb(102, 102, 102) in RGB and hsl(0, 0%, 40%) in HSL. It carries no registered color name of its own; the closest named color is Granite Gray (#676767), which is indistinguishable to the eye at a CIE76 distance of 0.41.

What is the RGB value of #666666?

#666666 is rgb(102, 102, 102) — red 102, green 102, and blue 102 on the 0-255 scale.

What is the CMYK value of #666666?

#666666 converts to approximately cmyk(0%, 0%, 0%, 60%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #666666 be black or white?

White text is the more readable choice. #666666 scores 5.74:1 against white and 3.66:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #666666 as a CSS color keyword?

No. #666666 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 dimgray (#696969) at a CIE76 distance of 1.22, which is below the threshold most people can see.

Open #666666 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 gray in the color library, the guide to shades of gray, or the full color library.