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#646B78 Color

#646B78 is rgb(100, 107, 120) in RGB, hsl(219, 9%, 43%) in HSL, and about cmyk(17%, 11%, 0%, 53%) in CMYK. It has no registered color name of its own — the closest is Black Coral (#54626F), clearly related but distinguishable side by side at ΔE 5.08. White text is the more readable choice on this background.

#646B78
HEX#646B78
RGBrgb(100, 107, 120)
HSLhsl(219, 9%, 43%)
HSVhsv(219, 17%, 47%)
CMYKcmyk(17%, 11%, 0%, 53%)
OKLCHoklch(52.6% 0.022 262.9)
LABlab(44.96% -0.56 -8.24)
LCHlch(44.96% 8.25 266.13)

What #646B78 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 #646B78, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Black Coral#54626FΔE 5.08Dark Electric Blue#536878ΔE 6.08Cadet#536872ΔE 6.17Steel#71797EΔE 7.11Iron Gray#555D61ΔE 8Dim Gray#696969ΔE 8.27

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

#646B78 Channel Values

How #646B78 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 100 · G 107 · B 1208-bit channels as sent to the display
HSLH 219° · S 9% · L 43%Easiest model for building lighter and darker variants
HSVH 219° · S 17% · V 47%Matches the picker in most design tools
CMYKC 17% · M 11% · Y 0% · K 53%Approximate ink mix; confirm with an ICC profile before printing
Luminance5.36:1 vs white · 3.92:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #646B78 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 text5.36:1AA normal AA large AAA normal
Fails AABlack text3.92:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #646B78 in the contrast checker.

Colors That Go With #646B78

Pairings derived from color-wheel relationships. The complementary color sits opposite #646B78; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#646B78
Complementary
#787164
Analogous
#647578
Analogous
#676478
Triadic
#78646B
Triadic
#6B7864
Split comp.
#786764
Split comp.
#757864

Tints & Shades of #646B78

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

#777F8D
#8D94A0
#A3A9B2
#B7BBC3
#CDD0D5
#E3E5E8

Shades

#565C67
#4A4F59
#3C4148
#31343A
#23252A
#17191C

Want a full 50-950 ramp with semantic roles? Generate design tokens from #646B78.

How #646B78 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#646B78
Protanopia#6A6A78
Protanomaly#686A78
Deuteranopia#696978
Deuteranomaly#676A78
Tritanopia#626D6D
Tritanomaly#636C71
Achromatopsia#6B6B6B

Test a full palette in the color blindness simulator.

Using #646B78 in Code

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

CSS custom property--color-646b78: #646B78;
CSS backgroundbackground-color: #646B78;
Tailwind configcolors: { 'color-646b78': '#646B78' }
SwiftUIColor(red: 0.392, green: 0.420, blue: 0.471)
Android XML<color name="color_646b78">#646B78</color>
SVG fillfill="#646B78"

More Gray Colors

#646B78 sits in the gray family. These are its neighbours across that family's full range, each with its own breakdown.

27272ad9d9d9292524d8d8d8292929d6d6d62a2d2fd6d3d12b2b2bd4d4d82e2e2ed4d4d435383943494e51484f5c5c5c6b6e707968788389968e8c84a1a1a1acacacbebebed1d1d1

#646B78 Frequently Asked Questions

What color is #646B78?

#646B78 is a mid-tone gray — rgb(100, 107, 120) in RGB and hsl(219, 9%, 43%) in HSL. It carries no registered color name of its own; the closest named color is Black Coral (#54626F), which is clearly related but distinguishable side by side at a CIE76 distance of 5.08.

What is the RGB value of #646B78?

#646B78 is rgb(100, 107, 120) — red 100, green 107, and blue 120 on the 0-255 scale.

What is the CMYK value of #646B78?

#646B78 converts to approximately cmyk(17%, 11%, 0%, 53%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #646B78 be black or white?

White text is the more readable choice. #646B78 scores 5.36:1 against white and 3.92:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #646B78 as a CSS color keyword?

No. #646B78 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 8.27, which is clearly related but distinguishable side by side.

Open #646B78 in a Tool

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

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