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#66B4E1 Color

#66B4E1 is rgb(102, 180, 225) in RGB, hsl(202, 67%, 64%) in HSL, and about cmyk(55%, 20%, 0%, 12%) in CMYK. It has no registered color name of its own — the closest is Aero (#7CB9E8), clearly related but distinguishable side by side at ΔE 5.25. Black text is the more readable choice on this background.

#66B4E1
HEX#66B4E1
RGBrgb(102, 180, 225)
HSLhsl(202, 67%, 64%)
HSVhsv(202, 55%, 88%)
CMYKcmyk(55%, 20%, 0%, 12%)
OKLCHoklch(73.7% 0.101 235.7)
LABlab(69.64% -15.40 -30.56)
LCHlch(69.64% 34.23 243.25)

What #66B4E1 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 #66B4E1, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Aero#7CB9E8ΔE 5.25Picton Blue#45B1E8ΔE 7.62Iceberg#71A6D2ΔE 7.71Maya Blue#73C2FBΔE 8.12Blizzard Blue#50BFE6ΔE 8.86Maximum Blue#47ABCCΔE 9.5

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

#66B4E1 Channel Values

How #66B4E1 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 102 · G 180 · B 2258-bit channels as sent to the display
HSLH 202° · S 67% · L 64%Easiest model for building lighter and darker variants
HSVH 202° · S 55% · V 88%Matches the picker in most design tools
CMYKC 55% · M 20% · Y 0% · K 12%Approximate ink mix; confirm with an ICC profile before printing
Luminance2.29:1 vs white · 9.18:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66B4E1 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 text2.29:1AA normal AA large AAA normal
TextBlack text9.18:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66B4E1 in the contrast checker.

Colors That Go With #66B4E1

Pairings derived from color-wheel relationships. The complementary color sits opposite #66B4E1; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#66B4E1
Complementary
#E19366
Analogous
#66E1D0
Analogous
#6676E1
Triadic
#E166B4
Triadic
#B4E166
Split comp.
#E16676
Split comp.
#E1D066

Tints & Shades of #66B4E1

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

#7BBEE5
#90C9E9
#A6D3ED
#B7DBF1
#CCE6F5
#E1F0F9

Shades

#3FA1D9
#288DC8
#2072A2
#195A80
#123F59
#0B2737

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66B4E1.

How #66B4E1 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#66B4E1
Protanopia#AAAAE1
Protanomaly#93AEE1
Deuteranopia#A0A0E2
Deuteranomaly#8CA8E2
Tritanopia#57BABA
Tritanomaly#5DB8CB
Achromatopsia#ABABAB

Test a full palette in the color blindness simulator.

Using #66B4E1 in Code

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

CSS custom property--color-66b4e1: #66B4E1;
CSS backgroundbackground-color: #66B4E1;
Tailwind configcolors: { 'color-66b4e1': '#66B4E1' }
SwiftUIColor(red: 0.400, green: 0.706, blue: 0.882)
Android XML<color name="color_66b4e1">#66B4E1</color>
SVG fillfill="#66B4E1"

More Blue Colors

#66B4E1 sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#66B4E1 Frequently Asked Questions

What color is #66B4E1?

#66B4E1 is a light blue — rgb(102, 180, 225) in RGB and hsl(202, 67%, 64%) in HSL. It carries no registered color name of its own; the closest named color is Aero (#7CB9E8), which is clearly related but distinguishable side by side at a CIE76 distance of 5.25.

What is the RGB value of #66B4E1?

#66B4E1 is rgb(102, 180, 225) — red 102, green 180, and blue 225 on the 0-255 scale.

What is the CMYK value of #66B4E1?

#66B4E1 converts to approximately cmyk(55%, 20%, 0%, 12%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66B4E1 be black or white?

Black text is the more readable choice. #66B4E1 scores 2.29:1 against white and 9.18:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66B4E1 as a CSS color keyword?

No. #66B4E1 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 lightskyblue (#87CEFA) at a CIE76 distance of 9.81, which is clearly related but distinguishable side by side.

Open #66B4E1 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.