HEX to HSL: #66CDAA

Also known as: CSS mediumaquamarine

#66CDAA → hsl(160 51% 60%)

Values are shown at full precision, so converting back gives exactly #66cdaa. 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. RGB ÷ 255
```
R = 0.4000
G = 0.8039
B = 0.6667
```

2. max, min, Δ

max = 0.8039
min = 0.4000
Δ = max − min = 0.4039

3. L
```
L = (max + min) / 2 = 0.6020 = 60.20%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.5074 = 50.74%

5. H

max is G → H = 60° × ((B − R) / Δ + 2) = 60° × ((0.6667 − 0.4000) / 0.4039 + 2) = 159.61°

6. HSL
```
hsl(159.61 50.74% 60.20%)
```

All formats

HEX: #66cdaa
RGB: rgb(102 205 170)
RGB (legacy): rgb(102, 205, 170)
HSL: hsl(159.61 50.74% 60.20%) → hsl(160 51% 60%)
HWB: hwb(160 40% 20%)
OKLCH: oklch(0.777 0.110 168.8) · oklch(77.7% 0.110 168.8)
OKLab: oklab(0.777 -0.108 0.021)
Lab (D50): lab(75.55 -37.75 7.83)
LCH (D50): lch(75.55 38.56 168.28)
Display P3: color(display-p3 0.5039 0.7946 0.6745)
Linear sRGB: color(srgb-linear 0.1329 0.6105 0.4020)

Gamut: sRGB and Display P3

#66CDAA is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.156 and Display P3 reaches 0.213; this color uses 71% of the sRGB chroma available.

CSS snippets

.element {
  color: #66cdaa;
  color: rgb(102 205 170);
  color: hsl(160 51% 60%);
  color: oklch(0.777 0.110 168.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.777 0.110 168.8);
}
/* arbitrary values */
class="text-[#66cdaa] bg-[oklch(0.777_0.110_168.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.5039 0.7946 0.6745); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #66cdaa 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

#7AE1BD · oklch(0.837 0.110 168.8) · ΔL +0.06
#51BA97 · oklch(0.717 0.110 168.8) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

Other converters for this color

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Guides: What is OKLCH?