HEX to OKLCH: #171717

Result

Values are shown at full precision, so converting back gives exactly #171717. 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: 23/255 = 0.09020 → 0.008568  (((x + 0.055) / 1.055)^2.4)
   B: 23/255 = 0.09020 → 0.008568  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.008568
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.008568
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.008568

3. 3. cube root

   l′ = ∛0.008568 = 0.204627
   m′ = ∛0.008568 = 0.204627
   s′ = ∛0.008568 = 0.204627

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.20463
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00000
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = 0.00000

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.00000
   H: a and b are ~0, so the hue is undefined (written as 0)
   L = 0.20463

6. 6. OKLCH

   oklch(0.20463 0.00000 0.000)
   rounded: oklch(0.205 0.000 0.0)

All formats

HEX

#171717

RGB

rgb(23 23 23)

RGB (legacy)

rgb(23, 23, 23)

HSL

hsl(0.00 0.00% 9.02%) → hsl(0 0% 9%)

HWB

hwb(0 9% 91%)

OKLCH

oklch(0.205 0.000 0.0) · oklch(20.5% 0.000 0.0)

OKLab

oklab(0.205 0.000 0.000)

Lab (D50)

lab(7.74 0.00 0.00)

LCH (D50)

lch(7.74 0.00 0.00)

Display P3

color(display-p3 0.0902 0.0902 0.0902)

Linear sRGB

color(srgb-linear 0.0086 0.0086 0.0086)

Gamut: sRGB and Display P3

#171717 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.083 and Display P3 reaches 0.093; this color uses 0% of the sRGB chroma available.

CSS snippets

.element {
  color: #171717;
  color: rgb(23 23 23);
  color: hsl(0 0% 9%);
  color: oklch(0.205 0.000 0.0);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.205 0.000 0.0);
}
/* arbitrary values */
class="text-[#171717] bg-[oklch(0.205_0.000_0.0)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0902 0.0902 0.0902); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #171717 calc(l - 0.1) c h); }

Nearby colors

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

• zinc-900#18181B
• stone-900#1C1917
• taupe-900#1D1816
• mist-900#161B1D
• mauve-900#1D161E
• olive-900#1D1D16
• v3 gray-900#111827
• gray-900#101828

Lighter and darker, same hue and chroma

• #252525 · oklch(0.265 0.000 0.0) · ΔL +0.06
• #0A0A0A · oklch(0.145 0.000 0.0) · ΔL −0.06

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