HEX to OKLCH: #A78BFA

Also known as: Tailwind v3 violet-400

#A78BFA → oklch(0.709 0.159 293.5)

Values are shown at full precision, so converting back gives exactly #a78bfa. 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: 167/255 = 0.65490 → 0.386429  (((x + 0.055) / 1.055)^2.4)
G: 139/255 = 0.54510 → 0.258183  (((x + 0.055) / 1.055)^2.4)
B: 250/255 = 0.98039 → 0.955973  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.346947
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.360299
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.709100

3. cube root

l′ = ∛0.346947 = 0.702675
m′ = ∛0.360299 = 0.711576
s′ = ∛0.709100 = 0.891735

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.70897
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.06357
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.14592

5. Oklab → OKLCH

C = √(a² + b²) = 0.15917
H = atan2(b, a) = 293.541°
L = 0.70897

6. OKLCH

oklch(0.70897 0.15917 293.541)
rounded: oklch(0.709 0.159 293.5)

All formats

HEX: #a78bfa
RGB: rgb(167 139 250)
RGB (legacy): rgb(167, 139, 250)
HSL: hsl(255.14 91.74% 76.27%) → hsl(255 92% 76%)
HWB: hwb(255 55% 2%)
OKLCH: oklch(0.709 0.159 293.5) · oklch(70.9% 0.159 293.5)
OKLab: oklab(0.709 0.064 -0.146)
Lab (D50): lab(64.08 29.18 -52.44)
LCH (D50): lch(64.08 60.01 299.10)
Display P3: color(display-p3 0.6372 0.5492 0.9527)
Linear sRGB: color(srgb-linear 0.3864 0.2582 0.9560)

Gamut: sRGB and Display P3

#A78BFA is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.169 and Display P3 reaches 0.183; this color uses 94% of the sRGB chroma available.

CSS snippets

.element {
  color: #a78bfa;
  color: rgb(167 139 250);
  color: hsl(255 92% 76%);
  color: oklch(0.709 0.159 293.5);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.709 0.159 293.5);
}
/* arbitrary values */
class="text-[#a78bfa] bg-[oklch(0.709_0.159_293.5)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.6372 0.5492 0.9527); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #a78bfa 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

#BA9EFF · oklch(0.769 0.159 293.5) · ΔL +0.06
#9578E5 · oklch(0.649 0.159 293.5) · ΔL −0.06

Open in the studio

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