HEX to OKLCH: #0000FF

Also known as: CSS blue

#0000FF → oklch(0.452 0.313 264.1)

Values are shown at full precision, so converting back gives exactly #0000ff. 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: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
G: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
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 = 0.051446
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.107397
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.629979

3. cube root

l′ = ∛0.051446 = 0.371921
m′ = ∛0.107397 = 0.475332
s′ = ∛0.629979 = 0.857252

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.45201
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.03246
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.31153

5. Oklab → OKLCH

C = √(a² + b²) = 0.31321
H = atan2(b, a) = 264.052°
L = 0.45201

6. OKLCH

oklch(0.45201 0.31321 264.052)
rounded: oklch(0.452 0.313 264.1)

All formats

HEX: #0000ff
RGB: rgb(0 0 255)
RGB (legacy): rgb(0, 0, 255)
HSL: hsl(240.00 100.00% 50.00%) → hsl(240 100% 50%)
HWB: hwb(240 0% 0%)
OKLCH: oklch(0.452 0.313 264.1) · oklch(45.2% 0.313 264.1)
OKLab: oklab(0.452 -0.032 -0.312)
Lab (D50): lab(29.57 68.29 -112.03)
LCH (D50): lch(29.57 131.20 301.36)
Display P3: color(display-p3 0.0000 0.0000 0.9596)
Linear sRGB: color(srgb-linear 0.0000 0.0000 1.0000)

Gamut: sRGB and Display P3

#0000FF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.266 and Display P3 reaches 0.313; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #0000ff;
  color: rgb(0 0 255);
  color: hsl(240 100% 50%);
  color: oklch(0.452 0.313 264.1);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.452 0.313 264.1);
}
/* arbitrary values */
class="text-[#0000ff] bg-[oklch(0.452_0.313_264.1)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0000 0.0000 0.9596); }
}

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

#0034FF · oklch(0.512 0.313 264.1) · ΔL +0.06
#0C00E9 · oklch(0.392 0.313 264.1) · 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?