HEX to HSL: #6B21A8

Also known as: Tailwind v3 purple-800

#6B21A8 → hsl(273 67% 39%)

Values are shown at full precision, so converting back gives exactly #6b21a8. 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 = 0.4196
G = 0.1294
B = 0.6588
```

2. max, min, Δ

max = 0.6588
min = 0.1294
Δ = max − min = 0.5294

3. L
```
L = (max + min) / 2 = 0.3941 = 39.41%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.6716 = 67.16%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.4196 − 0.1294) / 0.5294 + 4) = 272.89°

6. HSL
```
hsl(272.89 67.16% 39.41%)
```

All formats

HEX: #6b21a8
RGB: rgb(107 33 168)
RGB (legacy): rgb(107, 33, 168)
HSL: hsl(272.89 67.16% 39.41%) → hsl(273 67% 39%)
HWB: hwb(273 13% 34%)
OKLCH: oklch(0.438 0.198 303.7) · oklch(43.8% 0.198 303.7)
OKLab: oklab(0.438 0.110 -0.165)
Lab (D50): lab(31.20 50.29 -58.65)
LCH (D50): lch(31.20 77.26 310.61)
Display P3: color(display-p3 0.3865 0.1499 0.6344)
Linear sRGB: color(srgb-linear 0.1470 0.0152 0.3916)

Gamut: sRGB and Display P3

#6B21A8 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.229 and Display P3 reaches 0.240; this color uses 87% of the sRGB chroma available.

CSS snippets

.element {
  color: #6b21a8;
  color: rgb(107 33 168);
  color: hsl(273 67% 39%);
  color: oklch(0.438 0.198 303.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.438 0.198 303.7);
}
/* arbitrary values */
class="text-[#6b21a8] bg-[oklch(0.438_0.198_303.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3865 0.1499 0.6344); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #6b21a8 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

#7C37BC · oklch(0.498 0.198 303.7) · ΔL +0.06
#5A0094 · oklch(0.378 0.198 303.7) · 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?