HEX to OKLCH: #800000

Also known as: CSS maroon

#800000 → oklch(0.377 0.155 29.2)

Values are shown at full precision, so converting back gives exactly #800000. 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: 128/255 = 0.50196 → 0.215861  (((x + 0.055) / 1.055)^2.4)
G: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
B: 0/255 = 0.00000 → 0.000000  (÷ 12.92)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.088982
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.045742
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.019061

3. cube root

l′ = ∛0.088982 = 0.446445
m′ = ∛0.045742 = 0.357633
s′ = ∛0.019061 = 0.267125

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.37669
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.13489
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = 0.07549

5. Oklab → OKLCH

C = √(a² + b²) = 0.15458
H = atan2(b, a) = 29.234°
L = 0.37669

6. OKLCH

oklch(0.37669 0.15458 29.234)
rounded: oklch(0.377 0.155 29.2)

All formats

HEX: #800000
RGB: rgb(128 0 0)
RGB (legacy): rgb(128, 0, 0)
HSL: hsl(0.00 100.00% 25.10%) → hsl(0 100% 25%)
HWB: hwb(0 0% 50%)
OKLCH: oklch(0.377 0.155 29.2) · oklch(37.7% 0.155 29.2)
OKLab: oklab(0.377 0.135 0.075)
Lab (D50): lab(26.17 48.47 39.44)
LCH (D50): lch(26.17 62.49 39.13)
Display P3: color(display-p3 0.4584 0.0798 0.0472)
Linear sRGB: color(srgb-linear 0.2159 0.0000 0.0000)

Gamut: sRGB and Display P3

#800000 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.155 and Display P3 reaches 0.173; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #800000;
  color: rgb(128 0 0);
  color: hsl(0 100% 25%);
  color: oklch(0.377 0.155 29.2);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.377 0.155 29.2);
}
/* arbitrary values */
class="text-[#800000] bg-[oklch(0.377_0.155_29.2)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4584 0.0798 0.0472); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #800000 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

#941F16 · oklch(0.437 0.155 29.2) · ΔL +0.06
#6C0000 · oklch(0.317 0.155 29.2) · ΔL −0.06

Open in the studio

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Guides: What is OKLCH?