HEX to HSL: #ECFDF5

Also known as: Tailwind emerald-50, Tailwind v3 emerald-50

#ECFDF5 → hsl(152 81% 96%)

Values are shown at full precision, so converting back gives exactly #ecfdf5. 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 = 0.9255
G = 0.9922
B = 0.9608
```

2. max, min, Δ

max = 0.9922
min = 0.9255
Δ = max − min = 0.0667

3. L
```
L = (max + min) / 2 = 0.9588 = 95.88%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.8095 = 80.95%

5. H

max is G → H = 60° × ((B − R) / Δ + 2) = 60° × ((0.9608 − 0.9255) / 0.0667 + 2) = 151.76°

6. HSL
```
hsl(151.76 80.95% 95.88%)
```

All formats

HEX: #ecfdf5
RGB: rgb(236 253 245)
RGB (legacy): rgb(236, 253, 245)
HSL: hsl(151.76 80.95% 95.88%) → hsl(152 81% 96%)
HWB: hwb(152 93% 1%)
OKLCH: oklch(0.979 0.021 166.1) · oklch(97.9% 0.021 166.1)
OKLab: oklab(0.979 -0.020 0.005)
Lab (D50): lab(97.88 -6.84 1.83)
LCH (D50): lch(97.88 7.08 165.06)
Display P3: color(display-p3 0.9378 0.9900 0.9625)
Linear sRGB: color(srgb-linear 0.8388 0.9823 0.9131)

Gamut: sRGB and Display P3

#ECFDF5 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.029 and Display P3 reaches 0.033; this color uses 71% of the sRGB chroma available.

CSS snippets

.element {
  color: #ecfdf5;
  color: rgb(236 253 245);
  color: hsl(152 81% 96%);
  color: oklch(0.979 0.021 166.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.979 0.021 166.1);
}
/* arbitrary values */
class="text-[#ecfdf5] bg-[oklch(0.979_0.021_166.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.9378 0.9900 0.9625); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #ecfdf5 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

#F3FFFC · oklch(1.000 0.021 166.1) · ΔL +0.06
#D8E9E1 · oklch(0.919 0.021 166.1) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

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Guides: What is OKLCH?