HEX to OKLCH: #00FFFF

Also known as: CSS aqua, CSS cyan

#00FFFF → oklch(0.905 0.155 194.8)

Values are shown at full precision, so converting back gives exactly #00ffff. 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: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)
B: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.587779
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.788097
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.911698

3. cube root

l′ = ∛0.587779 = 0.837667
m′ = ∛0.788097 = 0.923690
s′ = ∛0.911698 = 0.969654

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.90540
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.14944
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.03940

5. Oklab → OKLCH

C = √(a² + b²) = 0.15455
H = atan2(b, a) = 194.769°
L = 0.90540

6. OKLCH

oklch(0.90540 0.15455 194.769)
rounded: oklch(0.905 0.155 194.8)

All formats

HEX: #00ffff
RGB: rgb(0 255 255)
RGB (legacy): rgb(0, 255, 255)
HSL: hsl(180.00 100.00% 50.00%) → hsl(180 100% 50%)
HWB: hwb(180 0% 0%)
OKLCH: oklch(0.905 0.155 194.8) · oklch(90.5% 0.155 194.8)
OKLab: oklab(0.905 -0.149 -0.039)
Lab (D50): lab(90.67 -50.66 -14.96)
LCH (D50): lch(90.67 52.82 196.45)
Display P3: color(display-p3 0.4584 0.9853 0.9925)
Linear sRGB: color(srgb-linear 0.0000 1.0000 1.0000)

Gamut: sRGB and Display P3

#00FFFF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.155 and Display P3 reaches 0.165; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #00ffff;
  color: rgb(0 255 255);
  color: hsl(180 100% 50%);
  color: oklch(0.905 0.155 194.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.905 0.155 194.8);
}
/* arbitrary values */
class="text-[#00ffff] bg-[oklch(0.905_0.155_194.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4584 0.9853 0.9925); }
}

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

#41FFFF · oklch(0.965 0.155 194.8) · ΔL +0.06
#00EBEB · oklch(0.845 0.155 194.8) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

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Guides: What is OKLCH?