HEX to RGB: #312C85

Also known as: Tailwind indigo-900

#312C85 → rgb(49 44 133)

Values are shown at full precision, so converting back gives exactly #312c85. 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. HEX → pairs
```
#312C85 → 31 | 2C | 85
```

2. base 16 → base 10

R = 31₁₆ = 3×16 + 1 = 49
G = 2C₁₆ = 2×16 + 12 = 44
B = 85₁₆ = 8×16 + 5 = 133

3. RGB
```
rgb(49 44 133)
```

All formats

HEX: #312c85
RGB: rgb(49 44 133)
RGB (legacy): rgb(49, 44, 133)
HSL: hsl(243.37 50.28% 34.71%) → hsl(243 50% 35%)
HWB: hwb(243 17% 48%)
OKLCH: oklch(0.359 0.144 278.8) · oklch(35.9% 0.144 278.8)
OKLab: oklab(0.359 0.022 -0.142)
Lab (D50): lab(23.37 24.66 -50.32)
LCH (D50): lch(23.37 56.04 296.10)
Display P3: color(display-p3 0.1888 0.1732 0.5020)
Linear sRGB: color(srgb-linear 0.0307 0.0252 0.2346)

Gamut: sRGB and Display P3

#312C85 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.219 and Display P3 reaches 0.222; this color uses 66% of the sRGB chroma available.

CSS snippets

.element {
  color: #312c85;
  color: rgb(49 44 133);
  color: hsl(243 50% 35%);
  color: oklch(0.359 0.144 278.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.359 0.144 278.8);
}
/* arbitrary values */
class="text-[#312c85] bg-[oklch(0.359_0.144_278.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1888 0.1732 0.5020); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #312c85 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

#3F3E98 · oklch(0.419 0.144 278.8) · ΔL +0.06
#241972 · oklch(0.299 0.144 278.8) · 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?