HEX to HSL: #581C87

Also known as: Tailwind v3 purple-900

#581C87 → hsl(274 66% 32%)

Values are shown at full precision, so converting back gives exactly #581c87. 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 = 0.3451
G = 0.1098
B = 0.5294
```

2. max, min, Δ

max = 0.5294
min = 0.1098
Δ = max − min = 0.4196

3. L
```
L = (max + min) / 2 = 0.3196 = 31.96%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.6564 = 65.64%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.3451 − 0.1098) / 0.4196 + 4) = 273.64°

6. HSL
```
hsl(273.64 65.64% 31.96%)
```

All formats

HEX: #581c87
RGB: rgb(88 28 135)
RGB (legacy): rgb(88, 28, 135)
HSL: hsl(273.64 65.64% 31.96%) → hsl(274 66% 32%)
HWB: hwb(274 11% 47%)
OKLCH: oklch(0.381 0.166 305.0) · oklch(38.1% 0.166 305.0)
OKLab: oklab(0.381 0.095 -0.136)
Lab (D50): lab(25.18 42.12 -48.39)
LCH (D50): lch(25.18 64.15 311.03)
Display P3: color(display-p3 0.3177 0.1256 0.5097)
Linear sRGB: color(srgb-linear 0.0976 0.0116 0.2423)

Gamut: sRGB and Display P3

#581C87 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.198 and Display P3 reaches 0.208; this color uses 84% of the sRGB chroma available.

CSS snippets

.element {
  color: #581c87;
  color: rgb(88 28 135);
  color: hsl(274 66% 32%);
  color: oklch(0.381 0.166 305.0);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.381 0.166 305.0);
}
/* arbitrary values */
class="text-[#581c87] bg-[oklch(0.381_0.166_305.0)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3177 0.1256 0.5097); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #581c87 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

#69309A · oklch(0.441 0.166 305.0) · ΔL +0.06
#480074 · oklch(0.321 0.166 305.0) · 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?