HEX to OKLCH: #374151

Result

Values are shown at full precision, so converting back gives exactly #374151. 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: 55/255 = 0.21569 → 0.038204  (((x + 0.055) / 1.055)^2.4)
   G: 65/255 = 0.25490 → 0.052861  (((x + 0.055) / 1.055)^2.4)
   B: 81/255 = 0.31765 → 0.082283  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.048333
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.052915
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.070102

3. 3. cube root

   l′ = ∛0.048333 = 0.364262
   m′ = ∛0.052915 = 0.375427
   s′ = ∛0.070102 = 0.412328

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.37293
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00546
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.03013

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.03062
   H = atan2(b, a) = 259.733°
   L = 0.37293

6. 6. OKLCH

   oklch(0.37293 0.03062 259.733)
   rounded: oklch(0.373 0.031 259.7)

All formats

HEX

#374151

RGB

rgb(55 65 81)

RGB (legacy)

rgb(55, 65, 81)

HSL

hsl(216.92 19.12% 26.67%) → hsl(217 19% 27%)

HWB

hwb(217 22% 68%)

OKLCH

oklch(0.373 0.031 259.7) · oklch(37.3% 0.031 259.7)

OKLab

oklab(0.373 -0.005 -0.030)

Lab (D50)

lab(27.13 -0.95 -11.13)

LCH (D50)

lch(27.13 11.17 265.11)

Display P3

color(display-p3 0.2232 0.2537 0.3122)

Linear sRGB

color(srgb-linear 0.0382 0.0529 0.0823)

Gamut: sRGB and Display P3

#374151 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.150 and Display P3 reaches 0.189; this color uses 20% of the sRGB chroma available.

CSS snippets

.element {
  color: #374151;
  color: rgb(55 65 81);
  color: hsl(217 19% 27%);
  color: oklch(0.373 0.031 259.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.373 0.031 259.7);
}
/* arbitrary values */
class="text-[#374151] bg-[oklch(0.373_0.031_259.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2232 0.2537 0.3122); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #374151 calc(l - 0.1) c h); }

Nearby colors

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

• gray-700#364153
• v3 slate-700#334155
• slate-700#314158
• zinc-700#3F3F46
• mist-700#394447
• neutral-700#404040
• mauve-700#463947
• v3 stone-700#44403C

Lighter and darker, same hue and chroma

• #475162 · oklch(0.433 0.031 259.7) · ΔL +0.06
• #283141 · oklch(0.313 0.031 259.7) · ΔL −0.06

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