HEX to OKLCH: #3F3F46

Result

Values are shown at full precision, so converting back gives exactly #3f3f46. 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: 63/255 = 0.24706 → 0.049707  (((x + 0.055) / 1.055)^2.4)
   G: 63/255 = 0.24706 → 0.049707  (((x + 0.055) / 1.055)^2.4)
   B: 70/255 = 0.27451 → 0.061246  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.050300
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.050946
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.056976

3. 3. cube root

   l′ = ∛0.050300 = 0.369139
   m′ = ∛0.050946 = 0.370712
   s′ = ∛0.056976 = 0.384797

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.37032
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00324
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.01143

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.01188
   H = atan2(b, a) = 285.805°
   L = 0.37032

6. 6. OKLCH

   oklch(0.37032 0.01188 285.805)
   rounded: oklch(0.370 0.012 285.8)

All formats

HEX

#3f3f46

RGB

rgb(63 63 70)

RGB (legacy)

rgb(63, 63, 70)

HSL

hsl(240.00 5.26% 26.08%) → hsl(240 5% 26%)

HWB

hwb(240 25% 73%)

OKLCH

oklch(0.370 0.012 285.8) · oklch(37.0% 0.012 285.8)

OKLab

oklab(0.370 0.003 -0.011)

Lab (D50)

lab(26.85 1.23 -4.28)

LCH (D50)

lch(26.85 4.46 286.00)

Display P3

color(display-p3 0.2471 0.2471 0.2722)

Linear sRGB

color(srgb-linear 0.0497 0.0497 0.0612)

Gamut: sRGB and Display P3

#3F3F46 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.215 and Display P3 reaches 0.220; this color uses 6% of the sRGB chroma available.

CSS snippets

.element {
  color: #3f3f46;
  color: rgb(63 63 70);
  color: hsl(240 5% 26%);
  color: oklch(0.370 0.012 285.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.370 0.012 285.8);
}
/* arbitrary values */
class="text-[#3f3f46] bg-[oklch(0.370_0.012_285.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2471 0.2471 0.2722); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #3f3f46 calc(l - 0.1) c h); }

Nearby colors

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

• neutral-700#404040
• mist-700#394447
• v3 stone-700#44403C
• v3 gray-700#374151
• stone-700#44403B
• mauve-700#463947
• taupe-700#473C39
• gray-700#364153

Lighter and darker, same hue and chroma

• #4F4F56 · oklch(0.430 0.012 285.8) · ΔL +0.06
• #303036 · oklch(0.310 0.012 285.8) · ΔL −0.06

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