HEX to OKLCH: #CBD5E1

Also known as: Tailwind v3 slate-300

#CBD5E1 → oklch(0.869 0.020 252.9)

Values are shown at full precision, so converting back gives exactly #cbd5e1. 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: 203/255 = 0.79608 → 0.597202  (((x + 0.055) / 1.055)^2.4)
G: 213/255 = 0.83529 → 0.665387  (((x + 0.055) / 1.055)^2.4)
B: 225/255 = 0.88235 → 0.752942  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.641784
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.660342
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.714524

3. cube root

l′ = ∛0.641784 = 0.862574
m′ = ∛0.660342 = 0.870809
s′ = ∛0.714524 = 0.894003

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.86898
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00584
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.01897

5. Oklab → OKLCH

C = √(a² + b²) = 0.01985
H = atan2(b, a) = 252.894°
L = 0.86898

6. OKLCH

oklch(0.86898 0.01985 252.894)
rounded: oklch(0.869 0.020 252.9)

All formats

HEX: #cbd5e1
RGB: rgb(203 213 225)
RGB (legacy): rgb(203, 213, 225)
HSL: hsl(212.73 26.83% 83.92%) → hsl(213 27% 84%)
HWB: hwb(213 80% 12%)
OKLCH: oklch(0.869 0.020 252.9) · oklch(86.9% 0.020 252.9)
OKLab: oklab(0.869 -0.006 -0.019)
Lab (D50): lab(84.77 -1.77 -7.16)
LCH (D50): lch(84.77 7.38 256.13)
Display P3: color(display-p3 0.8032 0.8340 0.8777)
Linear sRGB: color(srgb-linear 0.5972 0.6654 0.7529)

Gamut: sRGB and Display P3

#CBD5E1 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.066 and Display P3 reaches 0.072; this color uses 30% of the sRGB chroma available.

CSS snippets

.element {
  color: #cbd5e1;
  color: rgb(203 213 225);
  color: hsl(213 27% 84%);
  color: oklch(0.869 0.020 252.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.869 0.020 252.9);
}
/* arbitrary values */
class="text-[#cbd5e1] bg-[oklch(0.869_0.020_252.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.8032 0.8340 0.8777); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #cbd5e1 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

#DFE9F5 · oklch(0.929 0.020 252.9) · ΔL +0.06
#B8C2CD · oklch(0.809 0.020 252.9) · ΔL −0.06

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