HEX to OKLCH: #1E1B4B

Result

Values are shown at full precision, so converting back gives exactly #1e1b4b. 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. 1. sRGB → linear

   R: 30/255 = 0.11765 → 0.012983  (((x + 0.055) / 1.055)^2.4)
   G: 27/255 = 0.10588 → 0.010960  (((x + 0.055) / 1.055)^2.4)
   B: 75/255 = 0.29412 → 0.070360  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.014850
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.017768
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.048559

3. 3. cube root

   l′ = ∛0.014850 = 0.245796
   m′ = ∛0.017768 = 0.260944
   s′ = ∛0.048559 = 0.364831

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.25733
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.01685
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.08440

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.08607
   H = atan2(b, a) = 281.288°
   L = 0.25733

6. 6. OKLCH

   oklch(0.25733 0.08607 281.288)
   rounded: oklch(0.257 0.086 281.3)

All formats

HEX

#1e1b4b

RGB

rgb(30 27 75)

RGB (legacy)

rgb(30, 27, 75)

HSL

hsl(243.75 47.06% 20.00%) → hsl(244 47% 20%)

HWB

hwb(244 11% 71%)

OKLCH

oklch(0.257 0.086 281.3) · oklch(25.7% 0.086 281.3)

OKLab

oklab(0.257 0.017 -0.084)

Lab (D50)

lab(12.62 13.92 -29.99)

LCH (D50)

lch(12.62 33.07 294.90)

Display P3

color(display-p3 0.1156 0.1063 0.2830)

Linear sRGB

color(srgb-linear 0.0130 0.0110 0.0704)

Gamut: sRGB and Display P3

#1E1B4B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.154 and Display P3 reaches 0.157; this color uses 56% of the sRGB chroma available.

CSS snippets

.element {
  color: #1e1b4b;
  color: rgb(30 27 75);
  color: hsl(244 47% 20%);
  color: oklch(0.257 0.086 281.3);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.257 0.086 281.3);
}
/* arbitrary values */
class="text-[#1e1b4b] bg-[oklch(0.257_0.086_281.3)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1156 0.1063 0.2830); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1e1b4b calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

• indigo-950#1E1A4D
• blue-950#162456
• v3 blue-950#172554
• slate-800#1D293D
• v3 slate-800#1E293B
• v3 violet-950#2E1065
• gray-800#1E2939
• v3 gray-800#1F2937

Lighter and darker, same hue and chroma

• #2C2B5C · oklch(0.317 0.086 281.3) · ΔL +0.06
• #120B3A · oklch(0.197 0.086 281.3) · ΔL −0.06

Open in the studio