HEX to OKLCH: #1E90FF

Result

Values are shown at full precision, so converting back gives exactly #1e90ff. The rounded form is what you normally paste into CSS.

Step-by-step math

Every number below is computed from the input, nothing is looked up.

1. 1. sRGB → linear

   R: 30/255 = 0.11765 → 0.012983  (((x + 0.055) / 1.055)^2.4)
   G: 144/255 = 0.56471 → 0.278894  (((x + 0.055) / 1.055)^2.4)
   B: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.206378
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.299991
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.709695

3. 3. cube root

   l′ = ∛0.206378 = 0.590955
   m′ = ∛0.299991 = 0.669426
   s′ = ∛0.709695 = 0.891984

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.65201
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.05493
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.18201

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.19012
   H = atan2(b, a) = 253.205°
   L = 0.65201

6. 6. OKLCH

   oklch(0.65201 0.19012 253.205)
   rounded: oklch(0.652 0.190 253.2)

All formats

HEX

#1e90ff

RGB

rgb(30 144 255)

RGB (legacy)

rgb(30, 144, 255)

HSL

hsl(209.60 100.00% 55.88%) → hsl(210 100% 56%)

HWB

hwb(210 12% 0%)

OKLCH

oklch(0.652 0.190 253.2) · oklch(65.2% 0.190 253.2)

OKLab

oklab(0.652 -0.055 -0.182)

Lab (D50)

lab(58.36 0.89 -64.78)

LCH (D50)

lch(58.36 64.79 270.79)

Display P3

color(display-p3 0.2721 0.5565 0.9690)

Linear sRGB

color(srgb-linear 0.0130 0.2789 1.0000)

Gamut: sRGB and Display P3

#1E90FF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.190 and Display P3 reaches 0.205; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #1e90ff;
  color: rgb(30 144 255);
  color: hsl(210 100% 56%);
  color: oklch(0.652 0.190 253.2);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.652 0.190 253.2);
}
/* arbitrary values */
class="text-[#1e90ff] bg-[oklch(0.652_0.190_253.2)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2721 0.5565 0.9690); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1e90ff calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

• v3 blue-500#3B82F6
• blue-500#2B7FFF
• cornflowerblue#6495ED
• blue-400#51A2FF
• sky-500#00A6F4
• v3 sky-500#0EA5E9
• sky-600#0084D1
• v3 blue-400#60A5FA

Lighter and darker, same hue and chroma

• #38A3FF · oklch(0.712 0.190 253.2) · ΔL +0.06
• #007DEA · oklch(0.592 0.190 253.2) · ΔL −0.06

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