HEX to OKLCH: #5B21B6

Also known as: Tailwind v3 violet-800

#5B21B6 → oklch(0.432 0.211 292.8)

Values are shown at full precision, so converting back gives exactly #5b21b6. 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. sRGB → linear

R: 91/255 = 0.35686 → 0.104616  (((x + 0.055) / 1.055)^2.4)
G: 33/255 = 0.12941 → 0.015209  (((x + 0.055) / 1.055)^2.4)
B: 182/255 = 0.71373 → 0.467784  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.075348
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.082760
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.308216

3. cube root

l′ = ∛0.075348 = 0.422367
m′ = ∛0.082760 = 0.435785
s′ = ∛0.308216 = 0.675489

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.43199
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.08147
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.19419

5. Oklab → OKLCH

C = √(a² + b²) = 0.21059
H = atan2(b, a) = 292.759°
L = 0.43199

6. OKLCH

oklch(0.43199 0.21059 292.759)
rounded: oklch(0.432 0.211 292.8)

All formats

HEX: #5b21b6
RGB: rgb(91 33 182)
RGB (legacy): rgb(91, 33, 182)
HSL: hsl(263.36 69.30% 42.16%) → hsl(263 69% 42%)
HWB: hwb(263 13% 29%)
OKLCH: oklch(0.432 0.211 292.8) · oklch(43.2% 0.211 292.8)
OKLab: oklab(0.432 0.081 -0.194)
Lab (D50): lab(30.04 50.06 -69.00)
LCH (D50): lch(30.04 85.24 305.96)
Display P3: color(display-p3 0.3296 0.1436 0.6864)
Linear sRGB: color(srgb-linear 0.1046 0.0152 0.4678)

Gamut: sRGB and Display P3

#5B21B6 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.240 and Display P3 reaches 0.248; this color uses 88% of the sRGB chroma available.

CSS snippets

.element {
  color: #5b21b6;
  color: rgb(91 33 182);
  color: hsl(263 69% 42%);
  color: oklch(0.432 0.211 292.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.432 0.211 292.8);
}
/* arbitrary values */
class="text-[#5b21b6] bg-[oklch(0.432_0.211_292.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3296 0.1436 0.6864); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #5b21b6 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

#6B38CA · oklch(0.492 0.211 292.8) · ΔL +0.06
#4C00A2 · oklch(0.372 0.211 292.8) · ΔL −0.06

Open in the studio

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Guides: What is OKLCH?