HEX to HSL: #B91C1C

Also known as: Tailwind v3 red-700

#B91C1C → hsl(0 74% 42%)

Values are shown at full precision, so converting back gives exactly #b91c1c. 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 = 0.7255
G = 0.1098
B = 0.1098
```

2. max, min, Δ

max = 0.7255
min = 0.1098
Δ = max − min = 0.6157

3. L
```
L = (max + min) / 2 = 0.4176 = 41.76%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.7371 = 73.71%

5. H

max is R → H = 60° × (((G − B) / Δ) mod 6) = 60° × (((0.1098 − 0.1098) / 0.6157) mod 6) = 0.00°

6. HSL
```
hsl(0.00 73.71% 41.76%)
```

All formats

HEX: #b91c1c
RGB: rgb(185 28 28)
RGB (legacy): rgb(185, 28, 28)
HSL: hsl(0.00 73.71% 41.76%) → hsl(0 74% 42%)
HWB: hwb(0 11% 27%)
OKLCH: oklch(0.505 0.190 27.5) · oklch(50.5% 0.190 27.5)
OKLab: oklab(0.505 0.169 0.088)
Lab (D50): lab(40.73 59.92 43.88)
LCH (D50): lch(40.73 74.27 36.22)
Display P3: color(display-p3 0.6660 0.1804 0.1504)
Linear sRGB: color(srgb-linear 0.4851 0.0116 0.0116)

Gamut: sRGB and Display P3

#B91C1C is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.206 and Display P3 reaches 0.232; this color uses 92% of the sRGB chroma available.

CSS snippets

.element {
  color: #b91c1c;
  color: rgb(185 28 28);
  color: hsl(0 74% 42%);
  color: oklch(0.505 0.190 27.5);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.505 0.190 27.5);
}
/* arbitrary values */
class="text-[#b91c1c] bg-[oklch(0.505_0.190_27.5)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.6660 0.1804 0.1504); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #b91c1c 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

#CE3630 · oklch(0.565 0.190 27.5) · ΔL +0.06
#A40002 · oklch(0.445 0.190 27.5) · 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?