HEX to OKLCH: #FACC15

Result

Values are shown at full precision, so converting back gives exactly #facc15. 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: 250/255 = 0.98039 → 0.955973  (((x + 0.055) / 1.055)^2.4)
   G: 204/255 = 0.80000 → 0.603827  (((x + 0.055) / 1.055)^2.4)
   B: 21/255 = 0.08235 → 0.007499  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.718311
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.614404
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.259249

3. 3. cube root

   l′ = ∛0.718311 = 0.895579
   m′ = ∛0.614404 = 0.850129
   s′ = ∛0.259249 = 0.637635

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.86056
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00585
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = 0.17302

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.17311
   H = atan2(b, a) = 91.936°
   L = 0.86056

6. 6. OKLCH

   oklch(0.86056 0.17311 91.936)
   rounded: oklch(0.861 0.173 91.9)

All formats

HEX

#facc15

RGB

rgb(250 204 21)

RGB (legacy)

rgb(250, 204, 21)

HSL

hsl(47.95 95.82% 53.14%) → hsl(48 96% 53%)

HWB

hwb(48 8% 2%)

OKLCH

oklch(0.861 0.173 91.9) · oklch(86.1% 0.173 91.9)

OKLab

oklab(0.861 -0.006 0.173)

Lab (D50)

lab(84.28 6.28 82.06)

LCH (D50)

lch(84.28 82.30 85.63)

Display P3

color(display-p3 0.9516 0.8069 0.2868)

Linear sRGB

color(srgb-linear 0.9560 0.6038 0.0075)

Gamut: sRGB and Display P3

#FACC15 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.176 and Display P3 reaches 0.203; this color uses 98% of the sRGB chroma available.

CSS snippets

.element {
  color: #facc15;
  color: rgb(250 204 21);
  color: hsl(48 96% 53%);
  color: oklch(0.861 0.173 91.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.861 0.173 91.9);
}
/* arbitrary values */
class="text-[#facc15] bg-[oklch(0.861_0.173_91.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.9516 0.8069 0.2868); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #facc15 calc(l - 0.1) c h); }

Nearby colors

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

• yellow-400#FDC700
• amber-300#FFD230
• v3 amber-300#FCD34D
• gold#FFD700
• v3 amber-400#FBBF24
• amber-400#FFB900
• yellow-300#FFDF20
• v3 yellow-300#FDE047

Lighter and darker, same hue and chroma

• #FFE03C · oklch(0.921 0.173 91.9) · ΔL +0.06
• #E6B800 · oklch(0.801 0.173 91.9) · ΔL −0.06

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