HEX to OKLCH: #0000CD

Result

Values are shown at full precision, so converting back gives exactly #0000cd. 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: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
   G: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
   B: 205/255 = 0.80392 → 0.610496  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.031408
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.065565
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.384599

3. 3. cube root

   l′ = ∛0.031408 = 0.315509
   m′ = ∛0.065565 = 0.403235
   s′ = ∛0.384599 = 0.727226

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.38345
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.02753
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.26428

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.26571
   H = atan2(b, a) = 264.052°
   L = 0.38345

6. 6. OKLCH

   oklch(0.38345 0.26571 264.052)
   rounded: oklch(0.383 0.266 264.1)

All formats

HEX

#0000cd

RGB

rgb(0 0 205)

RGB (legacy)

rgb(0, 0, 205)

HSL

hsl(240.00 100.00% 40.20%) → hsl(240 100% 40%)

HWB

hwb(240 0% 20%)

OKLCH

oklch(0.383 0.266 264.1) · oklch(38.3% 0.266 264.1)

OKLab

oklab(0.383 -0.028 -0.264)

Lab (D50)

lab(22.66 57.93 -95.04)

LCH (D50)

lch(22.66 111.30 301.36)

Display P3

color(display-p3 0.0000 0.0000 0.7710)

Linear sRGB

color(srgb-linear 0.0000 0.0000 0.6105)

Gamut: sRGB and Display P3

#0000CD is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.225 and Display P3 reaches 0.266; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #0000cd;
  color: rgb(0 0 205);
  color: hsl(240 100% 40%);
  color: oklch(0.383 0.266 264.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.383 0.266 264.1);
}
/* arbitrary values */
class="text-[#0000cd] bg-[oklch(0.383_0.266_264.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0000 0.0000 0.7710); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #0000cd calc(l - 0.1) c h); }

Nearby colors

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

• blue-800#193CB8
• blue#0000FF
• indigo-800#372AAC
• v3 blue-800#1E40AF
• indigo-700#432DD7
• v3 indigo-800#3730A3
• v3 indigo-700#4338CA
• blue-700#1447E6

Lighter and darker, same hue and chroma

• #002DE2 · oklch(0.443 0.266 264.1) · ΔL +0.06
• #0900B8 · oklch(0.323 0.266 264.1) · ΔL −0.06

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