HEX to HSL: #191970

Also known as: CSS midnightblue

#191970 → hsl(240 64% 27%)

Values are shown at full precision, so converting back gives exactly #191970. 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 = 0.0980
G = 0.0980
B = 0.4392
```

2. max, min, Δ

max = 0.4392
min = 0.0980
Δ = max − min = 0.3412

3. L
```
L = (max + min) / 2 = 0.2686 = 26.86%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.6350 = 63.50%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.0980 − 0.0980) / 0.3412 + 4) = 240.00°

6. HSL
```
hsl(240.00 63.50% 26.86%)
```

All formats

HEX: #191970
RGB: rgb(25 25 112)
RGB (legacy): rgb(25, 25, 112)
HSL: hsl(240.00 63.50% 26.86%) → hsl(240 64% 27%)
HWB: hwb(240 10% 56%)
OKLCH: oklch(0.288 0.144 272.8) · oklch(28.8% 0.144 272.8)
OKLab: oklab(0.288 0.007 -0.143)
Lab (D50): lab(14.93 25.96 -50.90)
LCH (D50): lch(14.93 57.14 297.02)
Display P3: color(display-p3 0.0980 0.0980 0.4215)
Linear sRGB: color(srgb-linear 0.0097 0.0097 0.1620)

Gamut: sRGB and Display P3

#191970 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.184 and Display P3 reaches 0.186; this color uses 78% of the sRGB chroma available.

CSS snippets

.element {
  color: #191970;
  color: rgb(25 25 112);
  color: hsl(240 64% 27%);
  color: oklch(0.288 0.144 272.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.288 0.144 272.8);
}
/* arbitrary values */
class="text-[#191970] bg-[oklch(0.288_0.144_272.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0980 0.0980 0.4215); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #191970 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

#252C83 · oklch(0.348 0.144 272.8) · ΔL +0.06
#10015E · oklch(0.228 0.144 272.8) · 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?