HEX to HSL: #1F2937

Also known as: Tailwind v3 gray-800

#1F2937 → hsl(215 28% 17%)

Values are shown at full precision, so converting back gives exactly #1f2937. 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 = 0.1216
G = 0.1608
B = 0.2157
```

2. max, min, Δ

max = 0.2157
min = 0.1216
Δ = max − min = 0.0941

3. L
```
L = (max + min) / 2 = 0.1686 = 16.86%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.2791 = 27.91%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.1216 − 0.1608) / 0.0941 + 4) = 215.00°

6. HSL
```
hsl(215.00 27.91% 16.86%)
```

All formats

HEX: #1f2937
RGB: rgb(31 41 55)
RGB (legacy): rgb(31, 41, 55)
HSL: hsl(215.00 27.91% 16.86%) → hsl(215 28% 17%)
HWB: hwb(215 12% 78%)
OKLCH: oklch(0.278 0.030 256.8) · oklch(27.8% 0.030 256.8)
OKLab: oklab(0.278 -0.007 -0.029)
Lab (D50): lab(16.14 -1.18 -10.57)
LCH (D50): lch(16.14 10.64 263.63)
Display P3: color(display-p3 0.1294 0.1596 0.2110)
Linear sRGB: color(srgb-linear 0.0137 0.0222 0.0382)

Gamut: sRGB and Display P3

#1F2937 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.098 and Display P3 reaches 0.125; this color uses 30% of the sRGB chroma available.

CSS snippets

.element {
  color: #1f2937;
  color: rgb(31 41 55);
  color: hsl(215 28% 17%);
  color: oklch(0.278 0.030 256.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.278 0.030 256.8);
}
/* arbitrary values */
class="text-[#1f2937] bg-[oklch(0.278_0.030_256.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1294 0.1596 0.2110); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1f2937 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

#2E3847 · oklch(0.338 0.030 256.8) · ΔL +0.06
#111B28 · oklch(0.218 0.030 256.8) · ΔL −0.06

Open in the studio

Open in the OKLCH picker Check contrast on white

Other converters for this color

All converters →

Guides: What is OKLCH?