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#646C7D Color

#646C7D is rgb(100, 108, 125) in RGB, hsl(221, 11%, 44%) in HSL, and about cmyk(20%, 14%, 0%, 51%) in CMYK. It has no registered color name of its own — the closest is Dark Electric Blue (#536878), clearly related but distinguishable side by side at ΔE 5.63. White text is the more readable choice on this background.

#646C7D
HEX#646C7D
RGBrgb(100, 108, 125)
HSLhsl(221, 11%, 44%)
HSVhsv(221, 20%, 49%)
CMYKcmyk(20%, 14%, 0%, 51%)
OKLCHoklch(53.1% 0.028 265.4)
LABlab(45.40% -0.20 -10.57)
LCHlch(45.40% 10.57 268.91)

What #646C7D 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 #646C7D, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Dark Electric Blue#536878ΔE 5.63Black Coral#54626FΔE 5.68Cadet#536872ΔE 7.03Slate Gray#708090ΔE 7.92Steel#71797EΔE 8.57Deep Space Sparkle#4A646CΔE 9.93

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

#646C7D Channel Values

How #646C7D 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 108 · B 1258-bit channels as sent to the display
HSLH 221° · S 11% · L 44%Easiest model for building lighter and darker variants
HSVH 221° · S 20% · V 49%Matches the picker in most design tools
CMYKC 20% · M 14% · Y 0% · K 51%Approximate ink mix; confirm with an ICC profile before printing
Luminance5.27:1 vs white · 3.98:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #646C7D 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 text5.27:1AA normal AA large AAA normal
Fails AABlack text3.98:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #646C7D in the contrast checker.

Colors That Go With #646C7D

Pairings derived from color-wheel relationships. The complementary color sits opposite #646C7D; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#646C7D
Complementary
#7D7564
Analogous
#64787D
Analogous
#68647D
Triadic
#7D646C
Triadic
#6C7D64
Split comp.
#7D6864
Split comp.
#787D64

Tints & Shades of #646C7D

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

#778092
#8B92A2
#A2A7B4
#B8BDC6
#CFD2D8
#E3E4E8

Shades

#565D6C
#4B515D
#3D424C
#30333B
#22252A
#17181C

Want a full 50-950 ramp with semantic roles? Generate design tokens from #646C7D.

How #646C7D 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#646C7D
Protanopia#6B6B7D
Protanomaly#686B7D
Deuteranopia#69697D
Deuteranomaly#676A7D
Tritanopia#616E6E
Tritanomaly#626D74
Achromatopsia#6C6C6C

Test a full palette in the color blindness simulator.

Using #646C7D in Code

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

CSS custom property--color-646c7d: #646C7D;
CSS backgroundbackground-color: #646C7D;
Tailwind configcolors: { 'color-646c7d': '#646C7D' }
SwiftUIColor(red: 0.392, green: 0.424, blue: 0.490)
Android XML<color name="color_646c7d">#646C7D</color>
SVG fillfill="#646C7D"

More Blue Colors

#646C7D sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#646C7D Frequently Asked Questions

What color is #646C7D?

#646C7D is a mid-tone blue — rgb(100, 108, 125) in RGB and hsl(221, 11%, 44%) in HSL. It carries no registered color name of its own; the closest named color is Dark Electric Blue (#536878), which is clearly related but distinguishable side by side at a CIE76 distance of 5.63.

What is the RGB value of #646C7D?

#646C7D is rgb(100, 108, 125) — red 100, green 108, and blue 125 on the 0-255 scale.

What is the CMYK value of #646C7D?

#646C7D converts to approximately cmyk(20%, 14%, 0%, 51%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #646C7D be black or white?

White text is the more readable choice. #646C7D scores 5.27:1 against white and 3.98:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #646C7D as a CSS color keyword?

No. #646C7D 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 slategray (#708090) at a CIE76 distance of 7.92, which is clearly related but distinguishable side by side.

Open #646C7D in a Tool

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

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