Cerulean Blue
#2A52BECerulean Blue is #2A52BE, rgb(42, 82, 190).
About Cerulean Blue
Cerulean Blue is the hex color #2A52BE, which translates to rgb(42, 82, 190) in RGB and hsl(224, 64%, 45%) in HSL. On the color wheel it sits at 224 degrees, with a saturation of 64 percent and a lightness of 45 percent. That combination gives Cerulean Blue a saturated mid tone: strong enough for buttons and links, still calm enough for larger areas.
How Cerulean Blue compares
The closest standard CSS keyword is royalblue (#4169E1), a CIE76 distance of 10.6 away in CIELAB. That is a visible difference, so the keyword is not a substitute here. In the Tailwind CSS 4.3.1 palette the nearest token is blue-800 (#193CB8), at a distance of 14.7. Inside this library the closest neighbour is Sapphire at 3.8. Sorted by lightness, Cerulean Blue is number 12 of the 30 blue colors here.
Text on Cerulean Blue
2 of the five common text colors below clear WCAG AA for normal text on Cerulean Blue, led by White at 6.89:1. The ratios are computed with the WCAG relative luminance formula, the same one the contrast checker uses, which opens with Cerulean Blue already loaded as the background.
| Text color | Ratio | AA normal | AA large | AAA normal |
|---|---|---|---|---|
| White #FFFFFF | 6.89:1 | Pass | Pass | Fail |
| Ink black #0F0F12 | 2.78:1 | Fail | Fail | Fail |
| Mid grey #6B7280 | 1.42:1 | Fail | Fail | Fail |
| Dark grey #374151 | 1.50:1 | Fail | Fail | Fail |
| Light grey #E5E7EB | 5.56:1 | Pass | Pass | Fail |
Building a palette around Cerulean Blue
The pairings above give you three classic starting points. The complementary color sits opposite on the wheel and works well as an accent that draws the eye. The analogous colors sit right beside Cerulean Blue for calmer, harmonious combinations. The triadic pair spaces three hues evenly for a balanced, energetic palette. Open any swatch to explore it as its own color, or open the palette generator with Cerulean Blue locked and let it fill in the rest.
Full values for Cerulean Blue
| Format | Value |
|---|---|
| HEX | #2A52BE |
| RGB | rgb(42, 82, 190) |
| HSL | hsl(224, 64%, 45%) |
| HSV | hsv(224, 78%, 75%) |
| CMYK | cmyk(78%, 57%, 0%, 25%) |
| OKLCH | oklch(47.72% 0.1759 264.93) |
| CIELAB | lab(38.28 25.40 -60.71) |
Frequently asked questions
What is the RGB value of Cerulean Blue?
Cerulean Blue (#2A52BE) is rgb(42, 82, 190): 42 red, 82 green and 190 blue on the 0 to 255 scale. Blue leads at 190, green follows at 82 and red trails at 42, which puts the hue at 224 degrees. In HSL the same color is hsl(224, 64%, 45%).
What colour is #2A52BE?
#2A52BE is Cerulean Blue, a mid blue colour with a hue of 224 degrees, 64% saturation and 45% lightness. For print the CMYK breakdown is 78% cyan, 57% magenta, 0% yellow and 25% black. Its nearest neighbour in this library is Sapphire, 3.8 away in CIELAB, a difference you can see.
Is Cerulean Blue a CSS color name?
No. Cerulean Blue is not one of the 148 CSS named colors, so write it as #2A52BE. The nearest keyword is royalblue (#4169E1), a CIE76 distance of 10.6: far enough that the keyword reads as a different color.
What colors go with Cerulean Blue?
Opposite Cerulean Blue on the color wheel sits the complementary #BE962A, the boldest accent by hue. For a calmer scheme use the analogous neighbours #2A9CBE (close to Blue Munsell) and #4C2ABE; for a balanced three-color scheme use the triadic pair #BE2A52 and #52BE2A. Of these, #52BE2A has the most contrast against Cerulean Blue, at 2.87:1, so pair it by hue, not for legibility.
What text color is readable on Cerulean Blue?
White (#FFFFFF) is the most readable on Cerulean Blue, at 6.89:1, which clears WCAG AA (4.5:1) but not AAA. 2 of the 5 common text colors tested pass AA for normal text.
Use Cerulean Blue in a tool
Nearby colors
Last updated by FusionStudios. Every value on this page is computed by the same functions the tools use. How this is calculated.