HEX to OKLCH: #99A1AF

Result

Values are shown at full precision, so converting back gives exactly #99a1af. 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. 1. sRGB → linear

   R: 153/255 = 0.60000 → 0.318547  (((x + 0.055) / 1.055)^2.4)
   G: 161/255 = 0.63137 → 0.356400  (((x + 0.055) / 1.055)^2.4)
   B: 175/255 = 0.68627 → 0.428690  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.344515
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.356143
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.398599

3. 3. cube root

   l′ = ∛0.344515 = 0.701029
   m′ = ∛0.356143 = 0.708829
   s′ = ∛0.398599 = 0.735945

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.70708
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00321
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.02213

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.02236
   H = atan2(b, a) = 261.749°
   L = 0.70708

6. 6. OKLCH

   oklch(0.70708 0.02236 261.749)
   rounded: oklch(0.707 0.022 261.7)

All formats

HEX

#99a1af

RGB

rgb(153 161 175)

RGB (legacy)

rgb(153, 161, 175)

HSL

hsl(218.18 12.09% 64.31%) → hsl(218 12% 64%)

HWB

hwb(218 60% 31%)

OKLCH

oklch(0.707 0.022 261.7) · oklch(70.7% 0.022 261.7)

OKLab

oklab(0.707 -0.003 -0.022)

Lab (D50)

lab(65.93 -0.79 -8.32)

LCH (D50)

lch(65.93 8.35 264.59)

Display P3

color(display-p3 0.6057 0.6304 0.6811)

Linear sRGB

color(srgb-linear 0.3185 0.3564 0.4287)

Gamut: sRGB and Display P3

#99A1AF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.153 and Display P3 reaches 0.165; this color uses 15% of the sRGB chroma available.

CSS snippets

.element {
  color: #99a1af;
  color: rgb(153 161 175);
  color: hsl(218 12% 64%);
  color: oklch(0.707 0.022 261.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.707 0.022 261.7);
}
/* arbitrary values */
class="text-[#99a1af] bg-[oklch(0.707_0.022_261.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.6057 0.6304 0.6811); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #99a1af calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

• v3 gray-400#9CA3AF
• zinc-400#9F9FA9
• v3 zinc-400#A1A1AA
• v3 slate-400#94A3B8
• slate-400#90A1B9
• mauve-400#A89EA9
• neutral-400#A1A1A1
• mist-400#9CA8AB

Lighter and darker, same hue and chroma

• #ACB4C2 · oklch(0.767 0.022 261.7) · ΔL +0.06
• #878F9C · oklch(0.647 0.022 261.7) · ΔL −0.06

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