OKLCH to HEX: #312E81

Also known as: Tailwind v3 indigo-900

oklch(0.35875 0.13542 278.697) → #312E81

Values are shown at full precision, so converting back gives exactly #312e81. 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. input
```
oklch(0.35875 0.13542 278.697)
```

2. OKLCH → Oklab

a = C·cos H = 0.02048
b = C·sin H = -0.13386

3. Oklab → LMS′

l′ = L + 0.3963·a + 0.2158·b = 0.337978
m′ = L − 0.1056·a − 0.0639·b = 0.365136
s′ = L − 0.0895·a − 1.2915·b = 0.529800

4. cube

l = 0.337978³ = 0.038607
m = 0.365136³ = 0.048682
s = 0.529800³ = 0.148708

5. LMS → linear sRGB

R = 4.0767·l − 3.3077·m + 0.2310·s = 0.030712
G = −1.2684·l + 2.6098·m − 0.3413·s = 0.027320
B = −0.0042·l − 0.7034·m + 1.7076·s = 0.219531

6. linear → sRGB, × 255

R = 0.19215 × 255 = 49.00 → 49
G = 0.18039 × 255 = 46.00 → 46
B = 0.50589 × 255 = 129.00 → 129

7. RGB → HEX
```
#312E81
```

All formats

HEX: #312e81
RGB: rgb(49 46 129)
RGB (legacy): rgb(49, 46, 129)
HSL: hsl(242.17 47.43% 34.31%) → hsl(242 47% 34%)
HWB: hwb(242 18% 49%)
OKLCH: oklch(0.359 0.135 278.7) · oklch(35.9% 0.135 278.7)
OKLab: oklab(0.359 0.020 -0.134)
Lab (D50): lab(23.58 22.24 -47.48)
LCH (D50): lch(23.58 52.43 295.09)
Display P3: color(display-p3 0.1901 0.1808 0.4872)
Linear sRGB: color(srgb-linear 0.0307 0.0273 0.2195)

Gamut: sRGB and Display P3

#312E81 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 62% of the sRGB chroma available.

CSS snippets

.element {
  color: #312e81;
  color: rgb(49 46 129);
  color: hsl(242 47% 34%);
  color: oklch(0.359 0.135 278.7);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.359 0.135 278.7);
}
/* arbitrary values */
class="text-[#312e81] bg-[oklch(0.359_0.135_278.7)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1901 0.1808 0.4872); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #312e81 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

#3F4094 · oklch(0.419 0.135 278.7) · ΔL +0.06
#241C6E · oklch(0.299 0.135 278.7) · 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?