HSL to HEX: #FF0000

Also known as: CSS red

hsl(0.00 100.00% 50.00%) → #FF0000

Values are shown at full precision, so converting back gives exactly #ff0000. 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. input
```
H = 0.00°, S = 100.00%, L = 50.00%
```
2. C
```
C = (1 − |2L − 1|) × S = 1.00000
```

3. X

X = C × (1 − |(H / 60°) mod 2 − 1|) = 0.00000   (H / 60° = 0.0000, sector 0)

4. m
```
m = L − C / 2 = 0.00000
```

5. (R′, G′, B′) + m

(R′, G′, B′) = (1.00000, 0.00000, 0.00000)
R = round((1.00000 + 0.00000) × 255) = 255
G = round((0.00000 + 0.00000) × 255) = 0
B = round((0.00000 + 0.00000) × 255) = 0

6. RGB → HEX
```
#FF0000
```

All formats

HEX: #ff0000
RGB: rgb(255 0 0)
RGB (legacy): rgb(255, 0, 0)
HSL: hsl(0.00 100.00% 50.00%) → hsl(0 100% 50%)
HWB: hwb(0 0% 0%)
OKLCH: oklch(0.628 0.258 29.2) · oklch(62.8% 0.258 29.2)
OKLab: oklab(0.628 0.225 0.126)
Lab (D50): lab(54.29 80.80 69.89)
LCH (D50): lch(54.29 106.84 40.86)
Display P3: color(display-p3 0.9175 0.2003 0.1386)
Linear sRGB: color(srgb-linear 1.0000 0.0000 0.0000)

Gamut: sRGB and Display P3

#FF0000 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.258 and Display P3 reaches 0.288; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #ff0000;
  color: rgb(255 0 0);
  color: hsl(0 100% 50%);
  color: oklch(0.628 0.258 29.2);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.628 0.258 29.2);
}
/* arbitrary values */
class="text-[#ff0000] bg-[oklch(0.628_0.258_29.2)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.9175 0.2003 0.1386); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #ff0000 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

#FF3326 · oklch(0.688 0.258 29.2) · ΔL +0.06
#E80000 · oklch(0.568 0.258 29.2) · 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?