HEX to OKLCH: #78716C

Also known as: Tailwind v3 stone-500

#78716C → oklch(0.553 0.012 58.1)

Values are shown at full precision, so converting back gives exactly #78716c. 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: 120/255 = 0.47059 → 0.187821  (((x + 0.055) / 1.055)^2.4)
G: 113/255 = 0.44314 → 0.165132  (((x + 0.055) / 1.055)^2.4)
B: 108/255 = 0.42353 → 0.149960  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.173704
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.168311
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.157577

3. cube root

l′ = ∛0.173704 = 0.557961
m′ = ∛0.168311 = 0.552125
s′ = ∛0.157577 = 0.540130

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.55340
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.00614
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = 0.00985

5. Oklab → OKLCH

C = √(a² + b²) = 0.01161
H = atan2(b, a) = 58.071°
L = 0.55340

6. OKLCH

oklch(0.55340 0.01161 58.071)
rounded: oklch(0.553 0.012 58.1)

All formats

HEX: #78716c
RGB: rgb(120 113 108)
RGB (legacy): rgb(120, 113, 108)
HSL: hsl(25.00 5.26% 44.71%) → hsl(25 5% 45%)
HWB: hwb(25 42% 53%)
OKLCH: oklch(0.553 0.012 58.1) · oklch(55.3% 0.012 58.1)
OKLab: oklab(0.553 0.006 0.010)
Lab (D50): lab(48.17 2.10 3.81)
LCH (D50): lch(48.17 4.35 61.14)
Display P3: color(display-p3 0.4659 0.4441 0.4258)
Linear sRGB: color(srgb-linear 0.1878 0.1651 0.1500)

Gamut: sRGB and Display P3

#78716C is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.132 and Display P3 reaches 0.151; this color uses 9% of the sRGB chroma available.

CSS snippets

.element {
  color: #78716c;
  color: rgb(120 113 108);
  color: hsl(25 5% 45%);
  color: oklch(0.553 0.012 58.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.553 0.012 58.1);
}
/* arbitrary values */
class="text-[#78716c] bg-[oklch(0.553_0.012_58.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4659 0.4441 0.4258); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #78716c 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

#8A837D · oklch(0.613 0.012 58.1) · ΔL +0.06
#67605B · oklch(0.493 0.012 58.1) · ΔL −0.06

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