HEX to OKLCH: #737373

Result

Values are shown at full precision, so converting back gives exactly #737373. 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: 115/255 = 0.45098 → 0.171441  (((x + 0.055) / 1.055)^2.4)
   G: 115/255 = 0.45098 → 0.171441  (((x + 0.055) / 1.055)^2.4)
   B: 115/255 = 0.45098 → 0.171441  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.171441
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.171441
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.171441

3. 3. cube root

   l′ = ∛0.171441 = 0.555527
   m′ = ∛0.171441 = 0.555527
   s′ = ∛0.171441 = 0.555527

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.55553
   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 = 0.55553

6. 6. OKLCH

   oklch(0.55553 0.00000 0.000)
   rounded: oklch(0.556 0.000 0.0)

All formats

HEX

#737373

RGB

rgb(115 115 115)

RGB (legacy)

rgb(115, 115, 115)

HSL

hsl(0.00 0.00% 45.10%) → hsl(0 0% 45%)

HWB

hwb(0 45% 55%)

OKLCH

oklch(0.556 0.000 0.0) · oklch(55.6% 0.000 0.0)

OKLab

oklab(0.556 0.000 0.000)

Lab (D50)

lab(48.44 0.00 0.00)

LCH (D50)

lch(48.44 0.00 0.00)

Display P3

color(display-p3 0.4510 0.4510 0.4510)

Linear sRGB

color(srgb-linear 0.1714 0.1714 0.1714)

Gamut: sRGB and Display P3

#737373 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.225 and Display P3 reaches 0.254; this color uses 0% of the sRGB chroma available.

CSS snippets

.element {
  color: #737373;
  color: rgb(115 115 115);
  color: hsl(0 0% 45%);
  color: oklch(0.556 0.000 0.0);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.556 0.000 0.0);
}
/* arbitrary values */
class="text-[#737373] bg-[oklch(0.556_0.000_0.0)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4510 0.4510 0.4510); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #737373 calc(l - 0.1) c h); }

Nearby colors

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

• v3 stone-500#78716C
• stone-500#79716B
• v3 zinc-500#71717A
• zinc-500#71717B
• mist-500#67787C
• taupe-500#7C6D67
• v3 gray-500#6B7280
• gray-500#6A7282

Lighter and darker, same hue and chroma

• #858585 · oklch(0.616 0.000 0.0) · ΔL +0.06
• #626262 · oklch(0.496 0.000 0.0) · ΔL −0.06

Open in the studio