HEX to OKLCH: #2563EB

Result

Values are shown at full precision, so converting back gives exactly #2563eb. 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: 37/255 = 0.14510 → 0.018500  (((x + 0.055) / 1.055)^2.4)
   G: 99/255 = 0.38824 → 0.124772  (((x + 0.055) / 1.055)^2.4)
   B: 235/255 = 0.92157 → 0.830770  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.117285
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.178075
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.560152

3. 3. cube root

   l′ = ∛0.117285 = 0.489494
   m′ = ∛0.178075 = 0.562601
   s′ = ∛0.560152 = 0.824331

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.54615
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.02667
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.21355

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.21521
   H = atan2(b, a) = 262.881°
   L = 0.54615

6. 6. OKLCH

   oklch(0.54615 0.21521 262.881)
   rounded: oklch(0.546 0.215 262.9)

All formats

HEX

#2563eb

RGB

rgb(37 99 235)

RGB (legacy)

rgb(37, 99, 235)

HSL

hsl(221.21 83.19% 53.33%) → hsl(221 83% 53%)

HWB

hwb(221 15% 8%)

OKLCH

oklch(0.546 0.215 262.9) · oklch(54.6% 0.215 262.9)

OKLab

oklab(0.546 -0.027 -0.214)

Lab (D50)

lab(44.79 21.05 -75.60)

LCH (D50)

lch(44.79 78.47 285.56)

Display P3

color(display-p3 0.2132 0.3830 0.8890)

Linear sRGB

color(srgb-linear 0.0185 0.1248 0.8308)

Gamut: sRGB and Display P3

#2563EB is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.251 and Display P3 reaches 0.269; this color uses 86% of the sRGB chroma available.

CSS snippets

.element {
  color: #2563eb;
  color: rgb(37 99 235);
  color: hsl(221 83% 53%);
  color: oklch(0.546 0.215 262.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.546 0.215 262.9);
}
/* arbitrary values */
class="text-[#2563eb] bg-[oklch(0.546_0.215_262.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2132 0.3830 0.8890); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #2563eb calc(l - 0.1) c h); }

Nearby colors

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

• blue-600#155DFC
• royalblue#4169E1
• v3 blue-700#1D4ED8
• blue-700#1447E6
• v3 indigo-500#6366F1
• v3 indigo-600#4F46E5
• indigo-500#615FFF
• blue-500#2B7FFF

Lighter and darker, same hue and chroma

• #3777FF · oklch(0.606 0.215 262.9) · ΔL +0.06
• #124FD6 · oklch(0.486 0.215 262.9) · ΔL −0.06

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