HEX to HSL: #6366F1

Also known as: Tailwind v3 indigo-500

#6366F1 → hsl(239 84% 67%)

Values are shown at full precision, so converting back gives exactly #6366f1. 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 = 0.3882
G = 0.4000
B = 0.9451
```

2. max, min, Δ

max = 0.9451
min = 0.3882
Δ = max − min = 0.5569

3. L
```
L = (max + min) / 2 = 0.6667 = 66.67%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.8353 = 83.53%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.3882 − 0.4000) / 0.5569 + 4) = 238.73°

6. HSL
```
hsl(238.73 83.53% 66.67%)
```

All formats

HEX: #6366f1
RGB: rgb(99 102 241)
RGB (legacy): rgb(99, 102, 241)
HSL: hsl(238.73 83.53% 66.67%) → hsl(239 84% 67%)
HWB: hwb(239 39% 5%)
OKLCH: oklch(0.585 0.204 277.1) · oklch(58.5% 0.204 277.1)
OKLab: oklab(0.585 0.025 -0.202)
Lab (D50): lab(49.05 30.34 -71.87)
LCH (D50): lch(49.05 78.02 292.89)
Display P3: color(display-p3 0.3904 0.3996 0.9126)
Linear sRGB: color(srgb-linear 0.1248 0.1329 0.8796)

Gamut: sRGB and Display P3

#6366F1 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 0.246; this color uses 89% of the sRGB chroma available.

CSS snippets

.element {
  color: #6366f1;
  color: rgb(99 102 241);
  color: hsl(239 84% 67%);
  color: oklch(0.585 0.204 277.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.585 0.204 277.1);
}
/* arbitrary values */
class="text-[#6366f1] bg-[oklch(0.585_0.204_277.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3904 0.3996 0.9126); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #6366f1 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

#7379FF · oklch(0.645 0.204 277.1) · ΔL +0.06
#5452DC · oklch(0.525 0.204 277.1) · 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?