HEX to OKLCH: #155DFC

Also known as: Tailwind blue-600

#155DFC → oklch(0.547 0.246 262.9)

Values are shown at full precision, so converting back gives exactly #155dfc. 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. sRGB → linear

R: 21/255 = 0.08235 → 0.007499  (((x + 0.055) / 1.055)^2.4)
G: 93/255 = 0.36471 → 0.109462  (((x + 0.055) / 1.055)^2.4)
B: 252/255 = 0.98824 → 0.973445  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.111879
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.180645
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.644749

3. cube root

l′ = ∛0.111879 = 0.481855
m′ = ∛0.180645 = 0.565295
s′ = ∛0.644749 = 0.863900

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.54652
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.03049
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.24364

5. Oklab → OKLCH

C = √(a² + b²) = 0.24554
H = atan2(b, a) = 262.866°
L = 0.54652

6. OKLCH

oklch(0.54652 0.24554 262.866)
rounded: oklch(0.547 0.246 262.9)

All formats

HEX: #155dfc
RGB: rgb(21 93 252)
RGB (legacy): rgb(21, 93, 252)
HSL: hsl(221.30 97.47% 53.53%) → hsl(221 97% 54%)
HWB: hwb(221 8% 1%)
OKLCH: oklch(0.547 0.246 262.9) · oklch(54.7% 0.246 262.9)
OKLab: oklab(0.547 -0.030 -0.244)
Lab (D50): lab(44.11 29.12 -86.22)
LCH (D50): lch(44.11 91.01 288.66)
Display P3: color(display-p3 0.1741 0.3592 0.9521)
Linear sRGB: color(srgb-linear 0.0075 0.1095 0.9734)

Gamut: sRGB and Display P3

#155DFC is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.251 and Display P3 reaches 0.269; this color uses 98% of the sRGB chroma available.

CSS snippets

.element {
  color: #155dfc;
  color: rgb(21 93 252);
  color: hsl(221 97% 54%);
  color: oklch(0.547 0.246 262.9);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.547 0.246 262.9);
}
/* arbitrary values */
class="text-[#155dfc] bg-[oklch(0.547_0.246_262.9)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1741 0.3592 0.9521); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #155dfc 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

#2972FF · oklch(0.607 0.246 262.9) · ΔL +0.06
#0048E7 · oklch(0.487 0.246 262.9) · ΔL −0.06

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