HEX to OKLCH: #172554

Result

Values are shown at full precision, so converting back gives exactly #172554. 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: 23/255 = 0.09020 → 0.008568  (((x + 0.055) / 1.055)^2.4)
   G: 37/255 = 0.14510 → 0.018500  (((x + 0.055) / 1.055)^2.4)
   B: 84/255 = 0.32941 → 0.088656  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.018015
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.023930
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.061820

3. 3. cube root

   l′ = ∛0.018015 = 0.262148
   m′ = ∛0.023930 = 0.288169
   s′ = ∛0.061820 = 0.395405

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.28226
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00315
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.08739

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.08745
   H = atan2(b, a) = 267.935°
   L = 0.28226

6. 6. OKLCH

   oklch(0.28226 0.08745 267.935)
   rounded: oklch(0.282 0.087 267.9)

All formats

HEX

#172554

RGB

rgb(23 37 84)

RGB (legacy)

rgb(23, 37, 84)

HSL

hsl(226.23 57.01% 20.98%) → hsl(226 57% 21%)

HWB

hwb(226 9% 67%)

OKLCH

oklch(0.282 0.087 267.9) · oklch(28.2% 0.087 267.9)

OKLab

oklab(0.282 -0.003 -0.087)

Lab (D50)

lab(15.77 8.12 -31.06)

LCH (D50)

lch(15.77 32.10 284.65)

Display P3

color(display-p3 0.1020 0.1436 0.3175)

Linear sRGB

color(srgb-linear 0.0086 0.0185 0.0887)

Gamut: sRGB and Display P3

#172554 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.188 and Display P3 reaches 0.189; this color uses 46% of the sRGB chroma available.

CSS snippets

.element {
  color: #172554;
  color: rgb(23 37 84);
  color: hsl(226 57% 21%);
  color: oklch(0.282 0.087 267.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.282 0.087 267.9);
}
/* arbitrary values */
class="text-[#172554] bg-[oklch(0.282_0.087_267.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1020 0.1436 0.3175); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #172554 calc(l - 0.1) c h); }

Nearby colors

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

• blue-950#162456
• v3 indigo-950#1E1B4B
• indigo-950#1E1A4D
• sky-950#052F4A
• v3 sky-950#082F49
• slate-800#1D293D
• v3 slate-800#1E293B
• gray-800#1E2939

Lighter and darker, same hue and chroma

• #253565 · oklch(0.342 0.087 267.9) · ΔL +0.06
• #0A1543 · oklch(0.222 0.087 267.9) · ΔL −0.06

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