HEX to OKLCH: #00598A

Result

Values are shown at full precision, so converting back gives exactly #00598a. 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: 89/255 = 0.34902 → 0.099899  (((x + 0.055) / 1.055)^2.4)
   B: 138/255 = 0.54118 → 0.254152  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.066654
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.095296
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.188254

3. 3. cube root

   l′ = ∛0.066654 = 0.405455
   m′ = ∛0.095296 = 0.456764
   s′ = ∛0.188254 = 0.573123

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.44549
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.04906
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.09543

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.10730
   H = atan2(b, a) = 242.792°
   L = 0.44549

6. 6. OKLCH

   oklch(0.44549 0.10730 242.792)
   rounded: oklch(0.445 0.107 242.8)

All formats

HEX

#00598a

RGB

rgb(0 89 138)

RGB (legacy)

rgb(0, 89, 138)

HSL

hsl(201.30 100.00% 27.06%) → hsl(201 100% 27%)

HWB

hwb(201 0% 46%)

OKLCH

oklch(0.445 0.107 242.8) · oklch(44.5% 0.107 242.8)

OKLab

oklab(0.445 -0.049 -0.095)

Lab (D50)

lab(35.40 -8.29 -34.21)

LCH (D50)

lch(35.40 35.20 256.37)

Display P3

color(display-p3 0.1416 0.3434 0.5257)

Linear sRGB

color(srgb-linear 0.0000 0.0999 0.2542)

Gamut: sRGB and Display P3

#00598A is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.107 and Display P3 reaches 0.140; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #00598a;
  color: rgb(0 89 138);
  color: hsl(201 100% 27%);
  color: oklch(0.445 0.107 242.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.445 0.107 242.8);
}
/* arbitrary values */
class="text-[#00598a] bg-[oklch(0.445_0.107_242.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1416 0.3434 0.5257); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #00598a calc(l - 0.1) c h); }

Nearby colors

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

• v3 sky-800#075985
• cyan-800#005F78
• v3 cyan-800#155E75
• v3 sky-700#0369A1
• sky-900#024A70
• v3 sky-900#0C4A6E
• sky-700#0069A8
• cyan-900#104E64

Lighter and darker, same hue and chroma

• #1E6B9D · oklch(0.505 0.107 242.8) · ΔL +0.06
• #004878 · oklch(0.385 0.107 242.8) · ΔL −0.06

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