#646a66

Color #646a66

A nearly neutral, gray-leaning medium green.

Closest named color Dim Gray #696969 · ΔE 3.46 Nearest Tailwind class neutral-500 #737373 · ΔE 6

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Conversions

HEX

#646a66

RGB

rgb(100, 106, 102)

HSL

hsl(140, 2.9%, 40.4%)

HSV / HSB

hsv(140, 5.7%, 41.6%)

CMYK

cmyk(5.7%, 0%, 3.8%, 58.4%)

LAB

lab(44.2, -3.14, 1.45)

LCH

lch(44.2, 3.46, 155.21)

OKLCH

oklch(51.8%, 0.0097, 156.88)

HWB

hwb(140, 39.2%, 58.4%)

Harmony colors

Complementary

#6a6468

Analogous

#656a64

#646a66

#646a69

Triadic

#646a66

#66646a

#6a6664

Split-complementary

#646a66

#69646a

#6a6465

Tetradic

#646a66

#64686a

#6a6468

#6a6664

Square

#646a66

#64656a

#6a6468

#6a6964

Shades

Color #646a66 mixed toward black.

#535855

#434744

#323533

#212322

#111211

Tints

Color #646a66 mixed toward white.

#7d847f

#979d99

#b1b5b2

#cbcecc

#e5e6e5

Tones

Color #646a66 mixed toward gray.

#656a66

#656966

#666967

#666867

#676867

Accessibility

Aa White text on this color

5.53:1

Aa Black text on this color

3.8:1

White text reads better on this background (5.53:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#676767 · ΔE 4.5

Deuteranopia

#666667 · ΔE 5

Tritanopia

#646868 · ΔE 2.8

Achromatopsia

#686868 · ΔE 4.4

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #646a66;

Tailwind (arbitrary value)

bg-[#646a66]

Related colors

Sea Green #2e8b57

Medium Sea Green #3cb371

Spring Green #00ff7f

Mint Cream #f5fffa

Medium Spring Green #00fa9a

Medium Aquamarine #66cdaa

Frequently asked questions

#646a66 (#646a66) is rgb(100, 106, 102) in RGB.

No, #646a66 is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

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Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

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Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

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Build something with this color

Generate a full palette from #646a66, or check how it holds up for accessibility.

Generate a palette → Check contrast