HSL to HEX: #00008B

Also known as: CSS darkblue

hsl(240.00 100.00% 27.25%) → #00008B

Values are shown at full precision, so converting back gives exactly #00008b. 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 = 240.00°, S = 100.00%, L = 27.25%
```
2. C
```
C = (1 − |2L − 1|) × S = 0.54500
```

3. X

X = C × (1 − |(H / 60°) mod 2 − 1|) = 0.00000   (H / 60° = 4.0000, sector 4)

4. m
```
m = L − C / 2 = 0.00000
```

5. (R′, G′, B′) + m

(R′, G′, B′) = (0.00000, 0.00000, 0.54500)
R = round((0.00000 + 0.00000) × 255) = 0
G = round((0.00000 + 0.00000) × 255) = 0
B = round((0.54500 + 0.00000) × 255) = 139

6. RGB → HEX
```
#00008B
```

All formats

HEX: #00008b
RGB: rgb(0 0 139)
RGB (legacy): rgb(0, 0, 139)
HSL: hsl(240.00 100.00% 27.25%) → hsl(240 100% 27%)
HWB: hwb(240 0% 45%)
OKLCH: oklch(0.288 0.199 264.1) · oklch(28.8% 0.199 264.1)
OKLab: oklab(0.288 -0.021 -0.198)
Lab (D50): lab(13.02 43.48 -71.34)
LCH (D50): lch(13.02 83.54 301.36)
Display P3: color(display-p3 0.0000 0.0000 0.5221)
Linear sRGB: color(srgb-linear 0.0000 0.0000 0.2582)

Gamut: sRGB and Display P3

#00008B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.169 and Display P3 reaches 0.199; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #00008b;
  color: rgb(0 0 139);
  color: hsl(240 100% 27%);
  color: oklch(0.288 0.199 264.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.288 0.199 264.1);
}
/* arbitrary values */
class="text-[#00008b] bg-[oklch(0.288_0.199_264.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0000 0.0000 0.5221); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #00008b 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

#01219F · oklch(0.348 0.199 264.1) · ΔL +0.06
#060077 · oklch(0.228 0.199 264.1) · 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?