OKLCH to HEX: #3730A3

Result

Values are shown at full precision, so converting back gives exactly #3730a3. 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. input

   oklch(0.39843 0.17734 277.366)

2. 2. OKLCH → Oklab

   a = C·cos H = 0.02274
   b = C·sin H = -0.17588

3. 3. Oklab → LMS′

   l′ = L + 0.3963·a + 0.2158·b = 0.369486
   m′ = L − 0.1056·a − 0.0639·b = 0.407260
   s′ = L − 0.0895·a − 1.2915·b = 0.623537

4. 4. cube

   l = 0.369486³ = 0.050442
   m = 0.407260³ = 0.067549
   s = 0.623537³ = 0.242431

5. 5. LMS → linear sRGB

   R = 4.0767·l − 3.3077·m + 0.2310·s = 0.038203
   G = −1.2684·l + 2.6098·m − 0.3413·s = 0.029556
   B = −0.0042·l − 0.7034·m + 1.7076·s = 0.366252

6. 6. linear → sRGB, × 255

   R = 0.21568 × 255 = 55.00 → 55
   G = 0.18823 × 255 = 48.00 → 48
   B = 0.63921 × 255 = 163.00 → 163

7. 7. RGB → HEX

   #3730A3

All formats

HEX

#3730a3

RGB

rgb(55 48 163)

RGB (legacy)

rgb(55, 48, 163)

HSL

hsl(243.65 54.50% 41.37%) → hsl(244 55% 41%)

HWB

hwb(244 19% 36%)

OKLCH

oklch(0.398 0.177 277.4) · oklch(39.8% 0.177 277.4)

OKLab

oklab(0.398 0.023 -0.176)

Lab (D50)

lab(27.27 31.98 -62.36)

LCH (D50)

lch(27.27 70.08 297.15)

Display P3

color(display-p3 0.2111 0.1892 0.6149)

Linear sRGB

color(srgb-linear 0.0382 0.0296 0.3663)

Gamut: sRGB and Display P3

#3730A3 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 72% of the sRGB chroma available.

CSS snippets

.element {
  color: #3730a3;
  color: rgb(55 48 163);
  color: hsl(244 55% 41%);
  color: oklch(0.398 0.177 277.4);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.398 0.177 277.4);
}
/* arbitrary values */
class="text-[#3730a3] bg-[oklch(0.398_0.177_277.4)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.2111 0.1892 0.6149); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #3730a3 calc(l - 0.1) c h); }

Nearby colors

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

• indigo-800#372AAC
• v3 blue-800#1E40AF
• blue-900#1C398E
• blue-800#193CB8
• indigo-900#312C85
• v3 violet-900#4C1D95
• v3 blue-900#1E3A8A
• violet-900#4D179A

Lighter and darker, same hue and chroma

• #4543B7 · oklch(0.458 0.177 277.4) · ΔL +0.06
• #2B1A8F · oklch(0.338 0.177 277.4) · ΔL −0.06

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