HEX to OKLCH: #4B5563

Also known as: Tailwind v3 gray-600

#4B5563 → oklch(0.446 0.026 256.8)

Values are shown at full precision, so converting back gives exactly #4b5563. 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: 75/255 = 0.29412 → 0.070360  (((x + 0.055) / 1.055)^2.4)
G: 85/255 = 0.33333 → 0.090842  (((x + 0.055) / 1.055)^2.4)
B: 99/255 = 0.38824 → 0.124772  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.084144
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.090146
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.110408

3. cube root

l′ = ∛0.084144 = 0.438203
m′ = ∛0.090146 = 0.448382
s′ = ∛0.110408 = 0.479734

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.44611
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00601
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.02562

5. Oklab → OKLCH

C = √(a² + b²) = 0.02631
H = atan2(b, a) = 256.802°
L = 0.44611

6. OKLCH

oklch(0.44611 0.02631 256.802)
rounded: oklch(0.446 0.026 256.8)

All formats

HEX: #4b5563
RGB: rgb(75 85 99)
RGB (legacy): rgb(75, 85, 99)
HSL: hsl(215.00 13.79% 34.12%) → hsl(215 14% 34%)
HWB: hwb(215 29% 61%)
OKLCH: oklch(0.446 0.026 256.8) · oklch(44.6% 0.026 256.8)
OKLab: oklab(0.446 -0.006 -0.026)
Lab (D50): lab(35.66 -1.46 -9.54)
LCH (D50): lch(35.66 9.65 261.29)
Display P3: color(display-p3 0.3015 0.3321 0.3832)
Linear sRGB: color(srgb-linear 0.0704 0.0908 0.1248)

Gamut: sRGB and Display P3

#4B5563 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.157 and Display P3 reaches 0.200; this color uses 17% of the sRGB chroma available.

CSS snippets

.element {
  color: #4b5563;
  color: rgb(75 85 99);
  color: hsl(215 14% 34%);
  color: oklch(0.446 0.026 256.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.446 0.026 256.8);
}
/* arbitrary values */
class="text-[#4b5563] bg-[oklch(0.446_0.026_256.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3015 0.3321 0.3832); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #4b5563 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

#5C6674 · oklch(0.506 0.026 256.8) · ΔL +0.06
#3B4552 · oklch(0.386 0.026 256.8) · ΔL −0.06

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