HEX to OKLCH: #101828

Also known as: Tailwind gray-900

#101828 → oklch(0.210 0.034 263.4)

Values are shown at full precision, so converting back gives exactly #101828. 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: 16/255 = 0.06275 → 0.005182  (((x + 0.055) / 1.055)^2.4)
G: 24/255 = 0.09412 → 0.009134  (((x + 0.055) / 1.055)^2.4)
B: 40/255 = 0.15686 → 0.021219  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.008126
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.009594
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.016398

3. cube root

l′ = ∛0.008126 = 0.201048
m′ = ∛0.009594 = 0.212490
s′ = ∛0.016398 = 0.254058

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.20991
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00390
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.03391

5. Oklab → OKLCH

C = √(a² + b²) = 0.03413
H = atan2(b, a) = 263.436°
L = 0.20991

6. OKLCH

oklch(0.20991 0.03413 263.436)
rounded: oklch(0.210 0.034 263.4)

All formats

HEX: #101828
RGB: rgb(16 24 40)
RGB (legacy): rgb(16, 24, 40)
HSL: hsl(220.00 42.86% 10.98%) → hsl(220 43% 11%)
HWB: hwb(220 6% 84%)
OKLCH: oklch(0.210 0.034 263.4) · oklch(21.0% 0.034 263.4)
OKLab: oklab(0.210 -0.004 -0.034)
Lab (D50): lab(8.12 0.58 -12.27)
LCH (D50): lch(8.12 12.29 272.73)
Display P3: color(display-p3 0.0691 0.0932 0.1520)
Linear sRGB: color(srgb-linear 0.0052 0.0091 0.0212)

Gamut: sRGB and Display P3

#101828 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.111 and Display P3 reaches 0.135; this color uses 31% of the sRGB chroma available.

CSS snippets

.element {
  color: #101828;
  color: rgb(16 24 40);
  color: hsl(220 43% 11%);
  color: oklch(0.210 0.034 263.4);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.210 0.034 263.4);
}
/* arbitrary values */
class="text-[#101828] bg-[oklch(0.210_0.034_263.4)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0691 0.0932 0.1520); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #101828 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

#1E2637 · oklch(0.270 0.034 263.4) · ΔL +0.06
#050B19 · oklch(0.150 0.034 263.4) · ΔL −0.06

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