HEX to HSL: #0000CD

Also known as: CSS mediumblue

#0000CD → hsl(240 100% 40%)

Values are shown at full precision, so converting back gives exactly #0000cd. 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. RGB ÷ 255
```
R = 0.0000
G = 0.0000
B = 0.8039
```

2. max, min, Δ

max = 0.8039
min = 0.0000
Δ = max − min = 0.8039

3. L
```
L = (max + min) / 2 = 0.4020 = 40.20%
```

4. S

S = Δ / (1 − |2L − 1|) = 1.0000 = 100.00%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.0000 − 0.0000) / 0.8039 + 4) = 240.00°

6. HSL
```
hsl(240.00 100.00% 40.20%)
```

All formats

HEX: #0000cd
RGB: rgb(0 0 205)
RGB (legacy): rgb(0, 0, 205)
HSL: hsl(240.00 100.00% 40.20%) → hsl(240 100% 40%)
HWB: hwb(240 0% 20%)
OKLCH: oklch(0.383 0.266 264.1) · oklch(38.3% 0.266 264.1)
OKLab: oklab(0.383 -0.028 -0.264)
Lab (D50): lab(22.66 57.93 -95.04)
LCH (D50): lch(22.66 111.30 301.36)
Display P3: color(display-p3 0.0000 0.0000 0.7710)
Linear sRGB: color(srgb-linear 0.0000 0.0000 0.6105)

Gamut: sRGB and Display P3

#0000CD is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.225 and Display P3 reaches 0.266; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #0000cd;
  color: rgb(0 0 205);
  color: hsl(240 100% 40%);
  color: oklch(0.383 0.266 264.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.383 0.266 264.1);
}
/* arbitrary values */
class="text-[#0000cd] bg-[oklch(0.383_0.266_264.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0000 0.0000 0.7710); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #0000cd 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

#002DE2 · oklch(0.443 0.266 264.1) · ΔL +0.06
#0900B8 · oklch(0.323 0.266 264.1) · 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?