HEX to OKLCH: #52525B

Also known as: Tailwind v3 zinc-600

#52525B → oklch(0.442 0.015 285.8)

Values are shown at full precision, so converting back gives exactly #52525b. 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. sRGB → linear

R: 82/255 = 0.32157 → 0.084376  (((x + 0.055) / 1.055)^2.4)
G: 82/255 = 0.32157 → 0.084376  (((x + 0.055) / 1.055)^2.4)
B: 91/255 = 0.35686 → 0.104616  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.085417
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.086550
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.097127

3. cube root

l′ = ∛0.085417 = 0.440402
m′ = ∛0.086550 = 0.442339
s′ = ∛0.097127 = 0.459671

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.44186
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00398
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.01407

5. Oklab → OKLCH

C = √(a² + b²) = 0.01462
H = atan2(b, a) = 285.786°
L = 0.44186

6. OKLCH

oklch(0.44186 0.01462 285.786)
rounded: oklch(0.442 0.015 285.8)

All formats

HEX: #52525b
RGB: rgb(82 82 91)
RGB (legacy): rgb(82, 82, 91)
HSL: hsl(240.00 5.20% 33.92%) → hsl(240 5% 34%)
HWB: hwb(240 32% 64%)
OKLCH: oklch(0.442 0.015 285.8) · oklch(44.2% 0.015 285.8)
OKLab: oklab(0.442 0.004 -0.014)
Lab (D50): lab(35.12 1.51 -5.27)
LCH (D50): lch(35.12 5.48 286.03)
Display P3: color(display-p3 0.3216 0.3216 0.3539)
Linear sRGB: color(srgb-linear 0.0844 0.0844 0.1046)

Gamut: sRGB and Display P3

#52525B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.257 and Display P3 reaches 0.262; this color uses 6% of the sRGB chroma available.

CSS snippets

.element {
  color: #52525b;
  color: rgb(82 82 91);
  color: hsl(240 5% 34%);
  color: oklch(0.442 0.015 285.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.442 0.015 285.8);
}
/* arbitrary values */
class="text-[#52525b] bg-[oklch(0.442_0.015_285.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3216 0.3216 0.3539); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #52525b calc(l - 0.1) c h); }

Nearby colors

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

Lighter and darker, same hue and chroma

#63636C · oklch(0.502 0.015 285.8) · ΔL +0.06
#42424B · oklch(0.382 0.015 285.8) · ΔL −0.06

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