HEX to HSL: #0F172A

Also known as: Tailwind v3 slate-900

#0F172A → hsl(222 47% 11%)

Values are shown at full precision, so converting back gives exactly #0f172a. 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 = 0.0588
G = 0.0902
B = 0.1647
```

2. max, min, Δ

max = 0.1647
min = 0.0588
Δ = max − min = 0.1059

3. L
```
L = (max + min) / 2 = 0.1118 = 11.18%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.4737 = 47.37%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.0588 − 0.0902) / 0.1059 + 4) = 222.22°

6. HSL
```
hsl(222.22 47.37% 11.18%)
```

All formats

HEX: #0f172a
RGB: rgb(15 23 42)
RGB (legacy): rgb(15, 23, 42)
HSL: hsl(222.22 47.37% 11.18%) → hsl(222 47% 11%)
HWB: hwb(222 6% 84%)
OKLCH: oklch(0.208 0.040 265.8) · oklch(20.8% 0.040 265.8)
OKLab: oklab(0.208 -0.003 -0.040)
Lab (D50): lab(7.78 1.59 -14.30)
LCH (D50): lch(7.78 14.38 276.34)
Display P3: color(display-p3 0.0653 0.0893 0.1592)
Linear sRGB: color(srgb-linear 0.0048 0.0086 0.0232)

Gamut: sRGB and Display P3

#0F172A is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.142 and Display P3 reaches 0.142; this color uses 28% of the sRGB chroma available.

CSS snippets

.element {
  color: #0f172a;
  color: rgb(15 23 42);
  color: hsl(222 47% 11%);
  color: oklch(0.208 0.040 265.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.208 0.040 265.8);
}
/* arbitrary values */
class="text-[#0f172a] bg-[oklch(0.208_0.040_265.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0653 0.0893 0.1592); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #0f172a 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

#1D2539 · oklch(0.268 0.040 265.8) · ΔL +0.06
#04091B · oklch(0.148 0.040 265.8) · 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?