HEX to OKLCH: #09090B

Result

Values are shown at full precision, so converting back gives exactly #09090b. 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: 9/255 = 0.03529 → 0.002732  (÷ 12.92)
   G: 9/255 = 0.03529 → 0.002732  (÷ 12.92)
   B: 11/255 = 0.04314 → 0.003347  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.002763
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.002798
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.003119

3. 3. cube root

   l′ = ∛0.002763 = 0.140329
   m′ = ∛0.002798 = 0.140909
   s′ = ∛0.003119 = 0.146108

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.14077
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00120
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.00422

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.00439
   H = atan2(b, a) = 285.823°
   L = 0.14077

6. 6. OKLCH

   oklch(0.14077 0.00439 285.823)
   rounded: oklch(0.141 0.004 285.8)

All formats

HEX

#09090b

RGB

rgb(9 9 11)

RGB (legacy)

rgb(9, 9, 11)

HSL

hsl(240.00 10.00% 3.92%) → hsl(240 10% 4%)

HWB

hwb(240 4% 96%)

OKLCH

oklch(0.141 0.004 285.8) · oklch(14.1% 0.004 285.8)

OKLab

oklab(0.141 0.001 -0.004)

Lab (D50)

lab(2.50 0.21 -0.77)

LCH (D50)

lch(2.50 0.80 285.25)

Display P3

color(display-p3 0.0353 0.0353 0.0425)

Linear sRGB

color(srgb-linear 0.0027 0.0027 0.0033)

Gamut: sRGB and Display P3

#09090B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.082 and Display P3 reaches 0.083; this color uses 5% of the sRGB chroma available.

CSS snippets

.element {
  color: #09090b;
  color: rgb(9 9 11);
  color: hsl(240 10% 4%);
  color: oklch(0.141 0.004 285.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.141 0.004 285.8);
}
/* arbitrary values */
class="text-[#09090b] bg-[oklch(0.141_0.004_285.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0353 0.0353 0.0425); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #09090b calc(l - 0.1) c h); }

Nearby colors

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

• neutral-950#0A0A0A
• mauve-950#0C090C
• mist-950#090B0C
• stone-950#0C0A09
• olive-950#0C0C09
• gray-950#030712
• v3 slate-950#020617
• slate-950#020618

Lighter and darker, same hue and chroma

• #161618 · oklch(0.201 0.004 285.8) · ΔL +0.06
• #020202 · oklch(0.081 0.004 285.8) · ΔL −0.06

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