HEX to HSL: #64748B

Also known as: Tailwind v3 slate-500

#64748B → hsl(215 16% 47%)

Values are shown at full precision, so converting back gives exactly #64748b. 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 = 0.3922
G = 0.4549
B = 0.5451
```

2. max, min, Δ

max = 0.5451
min = 0.3922
Δ = max − min = 0.1529

3. L
```
L = (max + min) / 2 = 0.4686 = 46.86%
```

4. S

S = Δ / (1 − |2L − 1|) = 0.1632 = 16.32%

5. H

max is B → H = 60° × ((R − G) / Δ + 4) = 60° × ((0.3922 − 0.4549) / 0.1529 + 4) = 215.38°

6. HSL
```
hsl(215.38 16.32% 46.86%)
```

All formats

HEX: #64748b
RGB: rgb(100 116 139)
RGB (legacy): rgb(100, 116, 139)
HSL: hsl(215.38 16.32% 46.86%) → hsl(215 16% 47%)
HWB: hwb(215 39% 45%)
OKLCH: oklch(0.554 0.041 257.4) · oklch(55.4% 0.041 257.4)
OKLab: oklab(0.554 -0.009 -0.040)
Lab (D50): lab(48.16 -1.93 -14.72)
LCH (D50): lch(48.16 14.85 262.54)
Display P3: color(display-p3 0.4042 0.4530 0.5370)
Linear sRGB: color(srgb-linear 0.1274 0.1746 0.2582)

Gamut: sRGB and Display P3

#64748B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.200 and Display P3 reaches 0.254; this color uses 20% of the sRGB chroma available.

CSS snippets

.element {
  color: #64748b;
  color: rgb(100 116 139);
  color: hsl(215 16% 47%);
  color: oklch(0.554 0.041 257.4);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.554 0.041 257.4);
}
/* arbitrary values */
class="text-[#64748b] bg-[oklch(0.554_0.041_257.4)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4042 0.4530 0.5370); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #64748b 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

#75869D · oklch(0.614 0.041 257.4) · ΔL +0.06
#536379 · oklch(0.494 0.041 257.4) · 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?