HEX to OKLCH: #372AAC

Result

Values are shown at full precision, so converting back gives exactly #372aac. 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: 55/255 = 0.21569 → 0.038204  (((x + 0.055) / 1.055)^2.4)
   G: 42/255 = 0.16471 → 0.023153  (((x + 0.055) / 1.055)^2.4)
   B: 172/255 = 0.67451 → 0.412543  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.049390
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.068162
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.269789

3. 3. cube root

   l′ = ∛0.049390 = 0.366899
   m′ = ∛0.068162 = 0.408489
   s′ = ∛0.269789 = 0.646162

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.39877
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.02483
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.19328

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.19487
   H = atan2(b, a) = 277.320°
   L = 0.39877

6. 6. OKLCH

   oklch(0.39877 0.19487 277.320)
   rounded: oklch(0.399 0.195 277.3)

All formats

HEX

#372aac

RGB

rgb(55 42 172)

RGB (legacy)

rgb(55, 42, 172)

HSL

hsl(246.00 60.75% 41.96%) → hsl(246 61% 42%)

HWB

hwb(246 16% 33%)

OKLCH

oklch(0.399 0.195 277.3) · oklch(39.9% 0.195 277.3)

OKLab

oklab(0.399 0.025 -0.193)

Lab (D50)

lab(26.77 37.84 -68.60)

LCH (D50)

lch(26.77 78.34 298.88)

Display P3

color(display-p3 0.2076 0.1667 0.6484)

Linear sRGB

color(srgb-linear 0.0382 0.0232 0.4125)

Gamut: sRGB and Display P3

#372AAC is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.246 and Display P3 reaches 0.249; this color uses 79% of the sRGB chroma available.

CSS snippets

.element {
  color: #372aac;
  color: rgb(55 42 172);
  color: hsl(246 61% 42%);
  color: oklch(0.399 0.195 277.3);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.399 0.195 277.3);
}
/* arbitrary values */
class="text-[#372aac] bg-[oklch(0.399_0.195_277.3)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2076 0.1667 0.6484); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #372aac calc(l - 0.1) c h); }

Nearby colors

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

• v3 indigo-800#3730A3
• blue-800#193CB8
• v3 blue-800#1E40AF
• violet-900#4D179A
• v3 violet-900#4C1D95
• v3 indigo-700#4338CA
• blue-900#1C398E
• indigo-900#312C85

Lighter and darker, same hue and chroma

• #443FC0 · oklch(0.459 0.195 277.3) · ΔL +0.06
• #2B1098 · oklch(0.339 0.195 277.3) · ΔL −0.06

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