OKLCH to HEX: #818CF8

Also known as: Tailwind v3 indigo-400

oklch(0.68011 0.15830 276.935) → #818CF8

Values are shown at full precision, so converting back gives exactly #818cf8. 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(0.68011 0.15830 276.935)
```

2. OKLCH → Oklab

a = C·cos H = 0.01911
b = C·sin H = -0.15714

3. Oklab → LMS′

l′ = L + 0.3963·a + 0.2158·b = 0.653774
m′ = L − 0.1056·a − 0.0639·b = 0.688126
s′ = L − 0.0895·a − 1.2915·b = 0.881346

4. cube

l = 0.653774³ = 0.279436
m = 0.688126³ = 0.325840
s = 0.881346³ = 0.684604

5. LMS → linear sRGB

R = 4.0767·l − 3.3077·m + 0.2310·s = 0.219525
G = −1.2684·l + 2.6098·m − 0.3413·s = 0.262248
B = −0.0042·l − 0.7034·m + 1.7076·s = 0.938665

6. linear → sRGB, × 255

R = 0.50588 × 255 = 129.00 → 129
G = 0.54902 × 255 = 140.00 → 140
B = 0.97254 × 255 = 248.00 → 248

7. RGB → HEX
```
#818CF8
```

All formats

HEX: #818cf8
RGB: rgb(129 140 248)
RGB (legacy): rgb(129, 140, 248)
HSL: hsl(234.45 89.47% 73.92%) → hsl(234 89% 74%)
HWB: hwb(234 51% 3%)
OKLCH: oklch(0.680 0.158 276.9) · oklch(68.0% 0.158 276.9)
OKLab: oklab(0.680 0.019 -0.157)
Lab (D50): lab(61.11 17.73 -56.28)
LCH (D50): lch(61.11 59.00 287.48)
Display P3: color(display-p3 0.5139 0.5477 0.9441)
Linear sRGB: color(srgb-linear 0.2195 0.2623 0.9387)

Gamut: sRGB and Display P3

#818CF8 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.170 and Display P3 reaches 0.184; this color uses 93% of the sRGB chroma available.

CSS snippets

.element {
  color: #818cf8;
  color: rgb(129 140 248);
  color: hsl(234 89% 74%);
  color: oklch(0.680 0.158 276.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.680 0.158 276.9);
}
/* arbitrary values */
class="text-[#818cf8] bg-[oklch(0.680_0.158_276.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.5139 0.5477 0.9441); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #818cf8 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

#939FFF · oklch(0.740 0.158 276.9) · ΔL +0.06
#7079E3 · oklch(0.620 0.158 276.9) · 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?