HEX to HSL: #18181B

Also known as: Tailwind zinc-900, Tailwind v3 zinc-900

#18181B → hsl(240 6% 10%)

Values are shown at full precision, so converting back gives exactly #18181b. 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. RGB ÷ 255
```
R = 0.0941
G = 0.0941
B = 0.1059
```

2. max, min, Δ

max = 0.1059
min = 0.0941
Δ = max − min = 0.0118

3. L
```
L = (max + min) / 2 = 0.1000 = 10.00%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.0588 = 5.88%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.0941 − 0.0941) / 0.0118 + 4) = 240.00°

6. HSL
```
hsl(240.00 5.88% 10.00%)
```

All formats

HEX: #18181b
RGB: rgb(24 24 27)
RGB (legacy): rgb(24, 24, 27)
HSL: hsl(240.00 5.88% 10.00%) → hsl(240 6% 10%)
HWB: hwb(240 9% 89%)
OKLCH: oklch(0.210 0.006 285.9) · oklch(21.0% 0.006 285.9)
OKLab: oklab(0.210 0.002 -0.006)
Lab (D50): lab(8.35 0.60 -2.12)
LCH (D50): lch(8.35 2.20 285.90)
Display P3: color(display-p3 0.0941 0.0941 0.1049)
Linear sRGB: color(srgb-linear 0.0091 0.0091 0.0110)

Gamut: sRGB and Display P3

#18181B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.122 and Display P3 reaches 0.125; this color uses 5% of the sRGB chroma available.

CSS snippets

.element {
  color: #18181b;
  color: rgb(24 24 27);
  color: hsl(240 6% 10%);
  color: oklch(0.210 0.006 285.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.210 0.006 285.9);
}
/* arbitrary values */
class="text-[#18181b] bg-[oklch(0.210_0.006_285.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0941 0.0941 0.1049); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #18181b 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

#262629 · oklch(0.270 0.006 285.9) · ΔL +0.06
#0B0B0E · oklch(0.150 0.006 285.9) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

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Guides: What is OKLCH?