HEX to HSL: #ECFEFF

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

#ECFEFF → hsl(183 100% 96%)

Values are shown at full precision, so converting back gives exactly #ecfeff. 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 = 0.9961
B = 1.0000
```

2. max, min, Δ

max = 1.0000
min = 0.9255
Δ = max − min = 0.0745

3. L
```
L = (max + min) / 2 = 0.9627 = 96.27%
```

4. S

S = Δ / (1 − |2L − 1|) = 1.0000 = 100.00%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.9255 − 0.9961) / 0.0745 + 4) = 183.16°

6. HSL
```
hsl(183.16 100.00% 96.27%)
```

All formats

HEX: #ecfeff
RGB: rgb(236 254 255)
RGB (legacy): rgb(236, 254, 255)
HSL: hsl(183.16 100.00% 96.27%) → hsl(183 100% 96%)
HWB: hwb(183 93% 0%)
OKLCH: oklch(0.984 0.019 200.9) · oklch(98.4% 0.019 200.9)
OKLab: oklab(0.984 -0.018 -0.007)
Lab (D50): lab(98.34 -5.94 -2.61)
LCH (D50): lch(98.34 6.49 203.69)
Display P3: color(display-p3 0.9385 0.9938 0.9985)
Linear sRGB: color(srgb-linear 0.8388 0.9911 1.0000)

Gamut: sRGB and Display P3

#ECFEFF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.019 and Display P3 reaches 0.020; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #ecfeff;
  color: rgb(236 254 255);
  color: hsl(183 100% 96%);
  color: oklch(0.984 0.019 200.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.984 0.019 200.9);
}
/* arbitrary values */
class="text-[#ecfeff] bg-[oklch(0.984_0.019_200.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.9385 0.9938 0.9985); }
}

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

#F1FFFF · oklch(1.000 0.019 200.9) · ΔL +0.06
#D8EAEB · oklch(0.924 0.019 200.9) · 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?