HEX to OKLCH: #005F78

Result

Values are shown at full precision, so converting back gives exactly #005f78. 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: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
   G: 95/255 = 0.37255 → 0.114435  (((x + 0.055) / 1.055)^2.4)
   B: 120/255 = 0.47059 → 0.187821  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.071038
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.098067
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.150562

3. 3. cube root

   l′ = ∛0.071038 = 0.414156
   m′ = ∛0.098067 = 0.461149
   s′ = ∛0.150562 = 0.531992

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.45097
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.06103
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.05851

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.08455
   H = atan2(b, a) = 223.789°
   L = 0.45097

6. 6. OKLCH

   oklch(0.45097 0.08455 223.789)
   rounded: oklch(0.451 0.085 223.8)

All formats

HEX

#005f78

RGB

rgb(0 95 120)

RGB (legacy)

rgb(0, 95, 120)

HSL

hsl(192.50 100.00% 23.53%) → hsl(193 100% 24%)

HWB

hwb(192 0% 53%)

OKLCH

oklch(0.451 0.085 223.8) · oklch(45.1% 0.085 223.8)

OKLab

oklab(0.451 -0.061 -0.059)

Lab (D50)

lab(36.64 -17.36 -21.33)

LCH (D50)

lch(36.64 27.51 230.86)

Display P3

color(display-p3 0.1531 0.3666 0.4605)

Linear sRGB

color(srgb-linear 0.0000 0.1144 0.1878)

Gamut: sRGB and Display P3

#005F78 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.085 and Display P3 reaches 0.112; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #005f78;
  color: rgb(0 95 120);
  color: hsl(193 100% 24%);
  color: oklch(0.451 0.085 223.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.451 0.085 223.8);
}
/* arbitrary values */
class="text-[#005f78] bg-[oklch(0.451_0.085_223.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1531 0.3666 0.4605); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #005f78 calc(l - 0.1) c h); }

Nearby colors

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

• v3 cyan-800#155E75
• v3 sky-800#075985
• sky-800#00598A
• teal-800#005F5A
• v3 teal-800#115E59
• slate-600#45556C
• cyan-900#104E64
• v3 cyan-900#164E63

Lighter and darker, same hue and chroma

• #20708A · oklch(0.511 0.085 223.8) · ΔL +0.06
• #004E66 · oklch(0.391 0.085 223.8) · ΔL −0.06

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