HEX to OKLCH: #111827

Result

Values are shown at full precision, so converting back gives exactly #111827. 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: 17/255 = 0.06667 → 0.005605  (((x + 0.055) / 1.055)^2.4)
   G: 24/255 = 0.09412 → 0.009134  (((x + 0.055) / 1.055)^2.4)
   B: 39/255 = 0.15294 → 0.020289  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.008253
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.009584
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.015850

3. 3. cube root

   l′ = ∛0.008253 = 0.202089
   m′ = ∛0.009584 = 0.212416
   s′ = ∛0.015850 = 0.251192

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.21008
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00295
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.03162

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.03176
   H = atan2(b, a) = 264.665°
   L = 0.21008

6. 6. OKLCH

   oklch(0.21008 0.03176 264.665)
   rounded: oklch(0.210 0.032 264.7)

All formats

HEX

#111827

RGB

rgb(17 24 39)

RGB (legacy)

rgb(17, 24, 39)

HSL

hsl(220.91 39.29% 10.98%) → hsl(221 39% 11%)

HWB

hwb(221 7% 85%)

OKLCH

oklch(0.210 0.032 264.7) · oklch(21.0% 0.032 264.7)

OKLab

oklab(0.210 -0.003 -0.032)

Lab (D50)

lab(8.15 0.64 -11.47)

LCH (D50)

lch(8.15 11.49 273.21)

Display P3

color(display-p3 0.0722 0.0933 0.1484)

Linear sRGB

color(srgb-linear 0.0056 0.0091 0.0203)

Gamut: sRGB and Display P3

#111827 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.145 and Display P3 reaches 0.145; this color uses 22% of the sRGB chroma available.

CSS snippets

.element {
  color: #111827;
  color: rgb(17 24 39);
  color: hsl(221 39% 11%);
  color: oklch(0.210 0.032 264.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.210 0.032 264.7);
}
/* arbitrary values */
class="text-[#111827] bg-[oklch(0.210_0.032_264.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0722 0.0933 0.1484); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #111827 calc(l - 0.1) c h); }

Nearby colors

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

• gray-900#101828
• v3 slate-900#0F172A
• slate-900#0F172B
• zinc-900#18181B
• mauve-900#1D161E
• mist-900#161B1D
• neutral-900#171717
• stone-900#1C1917

Lighter and darker, same hue and chroma

• #1F2636 · oklch(0.270 0.032 264.7) · ΔL +0.06
• #050B19 · oklch(0.150 0.032 264.7) · ΔL −0.06

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