HEX to OKLCH: #51A2FF

Also known as: Tailwind blue-400

#51A2FF → oklch(0.704 0.158 253.6)

Values are shown at full precision, so converting back gives exactly #51a2ff. 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: 81/255 = 0.31765 → 0.082283  (((x + 0.055) / 1.055)^2.4)
G: 162/255 = 0.63529 → 0.361307  (((x + 0.055) / 1.055)^2.4)
B: 255/255 = 1.00000 → 1.000000  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.279145
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.370774
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.739031

3. cube root

l′ = ∛0.279145 = 0.653547
m′ = ∛0.370774 = 0.718406
s′ = ∛0.739031 = 0.904109

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.70400
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.04461
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.15185

5. Oklab → OKLCH

C = √(a² + b²) = 0.15827
H = atan2(b, a) = 253.627°
L = 0.70400

6. OKLCH

oklch(0.70400 0.15827 253.627)
rounded: oklch(0.704 0.158 253.6)

All formats

HEX: #51a2ff
RGB: rgb(81 162 255)
RGB (legacy): rgb(81, 162, 255)
HSL: hsl(212.07 100.00% 65.88%) → hsl(212 100% 66%)
HWB: hwb(212 32% 0%)
OKLCH: oklch(0.704 0.158 253.6) · oklch(70.4% 0.158 253.6)
OKLab: oklab(0.704 -0.045 -0.152)
Lab (D50): lab(64.80 -2.79 -54.46)
LCH (D50): lch(64.80 54.53 267.07)
Display P3: color(display-p3 0.3985 0.6279 0.9723)
Linear sRGB: color(srgb-linear 0.0823 0.3613 1.0000)

Gamut: sRGB and Display P3

#51A2FF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.158 and Display P3 reaches 0.171; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #51a2ff;
  color: rgb(81 162 255);
  color: hsl(212 100% 66%);
  color: oklch(0.704 0.158 253.6);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.704 0.158 253.6);
}
/* arbitrary values */
class="text-[#51a2ff] bg-[oklch(0.704_0.158_253.6)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.3985 0.6279 0.9723); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #51a2ff 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

#64B5FF · oklch(0.764 0.158 253.6) · ΔL +0.06
#3D8FEA · oklch(0.644 0.158 253.6) · ΔL −0.06

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