OKLCH to HEX: #404040

Result

Values are shown at full precision, so converting back gives exactly #404040. 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. input

   oklch(0.37149 0.00000 0.000)

2. 2. OKLCH → Oklab

   a = C·cos H = 0.00000
   b = C·sin H = 0.00000

3. 3. Oklab → LMS′

   l′ = L + 0.3963·a + 0.2158·b = 0.371490
   m′ = L − 0.1056·a − 0.0639·b = 0.371490
   s′ = L − 0.0895·a − 1.2915·b = 0.371490

4. 4. cube

   l = 0.371490³ = 0.051267
   m = 0.371490³ = 0.051267
   s = 0.371490³ = 0.051267

5. 5. LMS → linear sRGB

   R = 4.0767·l − 3.3077·m + 0.2310·s = 0.051267
   G = −1.2684·l + 2.6098·m − 0.3413·s = 0.051267
   B = −0.0042·l − 0.7034·m + 1.7076·s = 0.051267

6. 6. linear → sRGB, × 255

   R = 0.25098 × 255 = 64.00 → 64
   G = 0.25098 × 255 = 64.00 → 64
   B = 0.25098 × 255 = 64.00 → 64

7. 7. RGB → HEX

   #404040

All formats

HEX

#404040

RGB

rgb(64 64 64)

RGB (legacy)

rgb(64, 64, 64)

HSL

hsl(0.00 0.00% 25.10%) → hsl(0 0% 25%)

HWB

hwb(0 25% 75%)

OKLCH

oklch(0.371 0.000 0.0) · oklch(37.1% 0.000 0.0)

OKLab

oklab(0.371 0.000 0.000)

Lab (D50)

lab(27.09 0.00 0.00)

LCH (D50)

lch(27.09 0.00 0.00)

Display P3

color(display-p3 0.2510 0.2510 0.2510)

Linear sRGB

color(srgb-linear 0.0513 0.0513 0.0513)

Gamut: sRGB and Display P3

#404040 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.151 and Display P3 reaches 0.170; this color uses 0% of the sRGB chroma available.

CSS snippets

.element {
  color: #404040;
  color: rgb(64 64 64);
  color: hsl(0 0% 25%);
  color: oklch(0.371 0.000 0.0);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.371 0.000 0.0);
}
/* arbitrary values */
class="text-[#404040] bg-[oklch(0.371_0.000_0.0)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2510 0.2510 0.2510); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #404040 calc(l - 0.1) c h); }

Nearby colors

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

• v3 stone-700#44403C
• stone-700#44403B
• zinc-700#3F3F46
• mist-700#394447
• taupe-700#473C39
• mauve-700#463947
• v3 gray-700#374151
• olive-700#474739

Lighter and darker, same hue and chroma

• #505050 · oklch(0.431 0.000 0.0) · ΔL +0.06
• #313131 · oklch(0.311 0.000 0.0) · ΔL −0.06

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