OKLCH to HEX: #1E40AF

Also known as: Tailwind v3 blue-800

oklch(0.42445 0.18087 265.638) → #1E40AF

Values are shown at full precision, so converting back gives exactly #1e40af. 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(0.42445 0.18087 265.638)
```

2. OKLCH → Oklab

a = C·cos H = -0.01376
b = C·sin H = -0.18035

3. Oklab → LMS′

l′ = L + 0.3963·a + 0.2158·b = 0.380078
m′ = L − 0.1056·a − 0.0639·b = 0.437418
s′ = L − 0.0895·a − 1.2915·b = 0.658595

4. cube

l = 0.380078³ = 0.054906
m = 0.437418³ = 0.083693
s = 0.658595³ = 0.285664

5. LMS → linear sRGB

R = 4.0767·l − 3.3077·m + 0.2310·s = 0.012984
G = −1.2684·l + 2.6098·m − 0.3413·s = 0.051271
B = −0.0042·l − 0.7034·m + 1.7076·s = 0.428703

6. linear → sRGB, × 255

R = 0.11765 × 255 = 30.00 → 30
G = 0.25098 × 255 = 64.00 → 64
B = 0.68628 × 255 = 175.00 → 175

7. RGB → HEX
```
#1E40AF
```

All formats

HEX: #1e40af
RGB: rgb(30 64 175)
RGB (legacy): rgb(30, 64, 175)
HSL: hsl(225.93 70.73% 40.20%) → hsl(226 71% 40%)
HWB: hwb(226 12% 31%)
OKLCH: oklch(0.424 0.181 265.6) · oklch(42.4% 0.181 265.6)
OKLab: oklab(0.424 -0.014 -0.180)
Lab (D50): lab(30.79 22.35 -63.84)
LCH (D50): lch(30.79 67.64 289.29)
Display P3: color(display-p3 0.1508 0.2478 0.6609)
Linear sRGB: color(srgb-linear 0.0130 0.0513 0.4287)

Gamut: sRGB and Display P3

#1E40AF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.290 and Display P3 reaches 0.290; this color uses 62% of the sRGB chroma available.

CSS snippets

.element {
  color: #1e40af;
  color: rgb(30 64 175);
  color: hsl(226 71% 40%);
  color: oklch(0.424 0.181 265.6);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.424 0.181 265.6);
}
/* arbitrary values */
class="text-[#1e40af] bg-[oklch(0.424_0.181_265.6)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1508 0.2478 0.6609); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1e40af 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

#2D53C3 · oklch(0.484 0.181 265.6) · ΔL +0.06
#112C9B · oklch(0.364 0.181 265.6) · 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?