HEX to OKLCH: #00B8DB

Also known as: Tailwind cyan-500

#00B8DB → oklch(0.722 0.130 218.0)

Values are shown at full precision, so converting back gives exactly #00b8db. 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: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
G: 184/255 = 0.72157 → 0.479320  (((x + 0.055) / 1.055)^2.4)
B: 219/255 = 0.85882 → 0.708376  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.293518
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.402350
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.581295

3. cube root

l′ = ∛0.293518 = 0.664576
m′ = ∛0.402350 = 0.738247
s′ = ∛0.581295 = 0.834575

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.72235
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.10231
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.07981

5. Oklab → OKLCH

C = √(a² + b²) = 0.12976
H = atan2(b, a) = 217.955°
L = 0.72235

6. OKLCH

oklch(0.72235 0.12976 217.955)
rounded: oklch(0.722 0.130 218.0)

All formats

HEX: #00b8db
RGB: rgb(0 184 219)
RGB (legacy): rgb(0, 184, 219)
HSL: hsl(189.59 100.00% 42.94%) → hsl(190 100% 43%)
HWB: hwb(190 0% 14%)
OKLCH: oklch(0.722 0.130 218.0) · oklch(72.2% 0.130 218.0)
OKLab: oklab(0.722 -0.102 -0.080)
Lab (D50): lab(68.50 -30.80 -29.27)
LCH (D50): lch(68.50 42.49 223.54)
Display P3: color(display-p3 0.3229 0.7107 0.8432)
Linear sRGB: color(srgb-linear 0.0000 0.4793 0.7084)

Gamut: sRGB and Display P3

#00B8DB is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.130 and Display P3 reaches 0.172; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #00b8db;
  color: rgb(0 184 219);
  color: hsl(190 100% 43%);
  color: oklch(0.722 0.130 218.0);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.722 0.130 218.0);
}
/* arbitrary values */
class="text-[#00b8db] bg-[oklch(0.722_0.130_218.0)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3229 0.7107 0.8432); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #00b8db 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

#34CCEF · oklch(0.782 0.130 218.0) · ΔL +0.06
#00A5C7 · oklch(0.662 0.130 218.0) · ΔL −0.06

Open in the studio

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Guides: What is OKLCH?