HEX to HSL: #82181A

Also known as: Tailwind red-900

#82181A → hsl(359 69% 30%)

Values are shown at full precision, so converting back gives exactly #82181a. 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 = 0.5098
G = 0.0941
B = 0.1020
```

2. max, min, Δ

max = 0.5098
min = 0.0941
Δ = max − min = 0.4157

3. L
```
L = (max + min) / 2 = 0.3020 = 30.20%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.6883 = 68.83%

5. H

max is R → H = 60° × (((G − B) / Δ) mod 6) = 60° × (((0.0941 − 0.1020) / 0.4157) mod 6) = 358.87°

6. HSL
```
hsl(358.87 68.83% 30.20%)
```

All formats

HEX: #82181a
RGB: rgb(130 24 26)
RGB (legacy): rgb(130, 24, 26)
HSL: hsl(358.87 68.83% 30.20%) → hsl(359 69% 30%)
HWB: hwb(359 9% 49%)
OKLCH: oklch(0.397 0.141 25.7) · oklch(39.7% 0.141 25.7)
OKLab: oklab(0.397 0.127 0.061)
Lab (D50): lab(28.60 44.48 28.95)
LCH (D50): lch(28.60 53.07 33.06)
Display P3: color(display-p3 0.4675 0.1345 0.1225)
Linear sRGB: color(srgb-linear 0.2232 0.0091 0.0103)

Gamut: sRGB and Display P3

#82181A is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.161 and Display P3 reaches 0.182; this color uses 87% of the sRGB chroma available.

CSS snippets

.element {
  color: #82181a;
  color: rgb(130 24 26);
  color: hsl(359 69% 30%);
  color: oklch(0.397 0.141 25.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.397 0.141 25.7);
}
/* arbitrary values */
class="text-[#82181a] bg-[oklch(0.397_0.141_25.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4675 0.1345 0.1225); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #82181a 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

#962D2B · oklch(0.457 0.141 25.7) · ΔL +0.06
#6E0008 · oklch(0.337 0.141 25.7) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

Other converters for this color

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Guides: What is OKLCH?