HEX to OKLCH: #18181B

Result

Values are shown at full precision, so converting back gives exactly #18181b. 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: 24/255 = 0.09412 → 0.009134  (((x + 0.055) / 1.055)^2.4)
   G: 24/255 = 0.09412 → 0.009134  (((x + 0.055) / 1.055)^2.4)
   B: 27/255 = 0.10588 → 0.010960  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.009228
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.009330
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.010284

3. 3. cube root

   l′ = ∛0.009228 = 0.209750
   m′ = ∛0.009330 = 0.210522
   s′ = ∛0.010284 = 0.217467

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.21033
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00160
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.00564

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.00586
   H = atan2(b, a) = 285.885°
   L = 0.21033

6. 6. OKLCH

   oklch(0.21033 0.00586 285.885)
   rounded: oklch(0.210 0.006 285.9)

All formats

HEX

#18181b

RGB

rgb(24 24 27)

RGB (legacy)

rgb(24, 24, 27)

HSL

hsl(240.00 5.88% 10.00%) → hsl(240 6% 10%)

HWB

hwb(240 9% 89%)

OKLCH

oklch(0.210 0.006 285.9) · oklch(21.0% 0.006 285.9)

OKLab

oklab(0.210 0.002 -0.006)

Lab (D50)

lab(8.35 0.60 -2.12)

LCH (D50)

lch(8.35 2.20 285.90)

Display P3

color(display-p3 0.0941 0.0941 0.1049)

Linear sRGB

color(srgb-linear 0.0091 0.0091 0.0110)

Gamut: sRGB and Display P3

#18181B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.122 and Display P3 reaches 0.125; this color uses 5% of the sRGB chroma available.

CSS snippets

.element {
  color: #18181b;
  color: rgb(24 24 27);
  color: hsl(240 6% 10%);
  color: oklch(0.210 0.006 285.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.210 0.006 285.9);
}
/* arbitrary values */
class="text-[#18181b] bg-[oklch(0.210_0.006_285.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0941 0.0941 0.1049); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #18181b calc(l - 0.1) c h); }

Nearby colors

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

• neutral-900#171717
• mist-900#161B1D
• stone-900#1C1917
• taupe-900#1D1816
• mauve-900#1D161E
• olive-900#1D1D16
• v3 gray-900#111827
• gray-900#101828

Lighter and darker, same hue and chroma

• #262629 · oklch(0.270 0.006 285.9) · ΔL +0.06
• #0B0B0E · oklch(0.150 0.006 285.9) · ΔL −0.06

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