OKLCH to HEX: #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. input

   oklch(0.21033 0.00586 285.885)

2. 2. OKLCH → Oklab

   a = C·cos H = 0.00160
   b = C·sin H = -0.00564

3. 3. Oklab → LMS′

   l′ = L + 0.3963·a + 0.2158·b = 0.209749
   m′ = L − 0.1056·a − 0.0639·b = 0.210521
   s′ = L − 0.0895·a − 1.2915·b = 0.217466

4. 4. cube

   l = 0.209749³ = 0.009228
   m = 0.210521³ = 0.009330
   s = 0.217466³ = 0.010284

5. 5. LMS → linear sRGB

   R = 4.0767·l − 3.3077·m + 0.2310·s = 0.009134
   G = −1.2684·l + 2.6098·m − 0.3413·s = 0.009134
   B = −0.0042·l − 0.7034·m + 1.7076·s = 0.010960

6. 6. linear → sRGB, × 255

   R = 0.09412 × 255 = 24.00 → 24
   G = 0.09412 × 255 = 24.00 → 24
   B = 0.10588 × 255 = 27.00 → 27

7. 7. RGB → HEX

   #18181B

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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