HSL to HEX: #1E40AF

Also known as: Tailwind v3 blue-800

hsl(225.93 70.73% 40.20%) → #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
```
H = 225.93°, S = 70.73%, L = 40.20%
```
2. C
```
C = (1 − |2L − 1|) × S = 0.56867
```

3. X

X = C × (1 − |(H / 60°) mod 2 − 1|) = 0.13335   (H / 60° = 3.7655, sector 3)

4. m
```
m = L − C / 2 = 0.11767
```

5. (R′, G′, B′) + m

(R′, G′, B′) = (0.00000, 0.13335, 0.56867)
R = round((0.00000 + 0.11767) × 255) = 30
G = round((0.13335 + 0.11767) × 255) = 64
B = round((0.56867 + 0.11767) × 255) = 175

6. 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

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Guides: What is OKLCH?