HEX to OKLCH: #FFFF00

Also known as: CSS yellow

#FFFF00 → oklch(0.968 0.211 109.8)

Values are shown at full precision, so converting back gives exactly #ffff00. 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. sRGB → linear

R: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)
G: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)
B: 0/255 = 0.00000 → 0.000000  (÷ 12.92)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.948554
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.892603
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.370021

3. cube root

l′ = ∛0.948554 = 0.982549
m′ = ∛0.892603 = 0.962837
s′ = ∛0.370021 = 0.717919

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.96798
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.07137
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = 0.19857

5. Oklab → OKLCH

C = √(a² + b²) = 0.21101
H = atan2(b, a) = 109.769°
L = 0.96798

6. OKLCH

oklch(0.96798 0.21101 109.769)
rounded: oklch(0.968 0.211 109.8)

All formats

HEX: #ffff00
RGB: rgb(255 255 0)
RGB (legacy): rgb(255, 255, 0)
HSL: hsl(60.00 100.00% 50.00%) → hsl(60 100% 50%)
HWB: hwb(60 0% 0%)
OKLCH: oklch(0.968 0.211 109.8) · oklch(96.8% 0.211 109.8)
OKLab: oklab(0.968 -0.071 0.199)
Lab (D50): lab(97.61 -15.75 93.39)
LCH (D50): lch(97.61 94.71 99.57)
Display P3: color(display-p3 1.0000 1.0000 0.3309)
Linear sRGB: color(srgb-linear 1.0000 1.0000 0.0000)

Gamut: sRGB and Display P3

#FFFF00 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.211 and Display P3 reaches 0.211; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #ffff00;
  color: rgb(255 255 0);
  color: hsl(60 100% 50%);
  color: oklch(0.968 0.211 109.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.968 0.211 109.8);
}
/* arbitrary values */
class="text-[#ffff00] bg-[oklch(0.968_0.211_109.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 1.0000 1.0000 0.3309); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #ffff00 calc(l - 0.1) c h); }

Nearby colors

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

Lighter and darker, same hue and chroma

#FFFF2A · oklch(1.000 0.211 109.8) · ΔL +0.06
#EBEB00 · oklch(0.908 0.211 109.8) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

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Guides: What is OKLCH?