HEX to OKLCH: #1F2937

Result

Values are shown at full precision, so converting back gives exactly #1f2937. 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. 1. sRGB → linear

   R: 31/255 = 0.12157 → 0.013702  (((x + 0.055) / 1.055)^2.4)
   G: 41/255 = 0.16078 → 0.022174  (((x + 0.055) / 1.055)^2.4)
   B: 55/255 = 0.21569 → 0.038204  (((x + 0.055) / 1.055)^2.4)

2. 2. linear sRGB → LMS

   l = 0.4122·R + 0.5363·G + 0.0514·B = 0.019506
   m = 0.2119·R + 0.6807·G + 0.1074·B = 0.022100
   s = 0.0883·R + 0.2817·G + 0.6300·B = 0.031525

3. 3. cube root

   l′ = ∛0.019506 = 0.269190
   m′ = ∛0.022100 = 0.280629
   s′ = ∛0.031525 = 0.315900

4. 4. LMS′ → Oklab

   L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.27808
   a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.00673
   b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.02882

5. 5. Oklab → OKLCH

   C = √(a² + b²) = 0.02960
   H = atan2(b, a) = 256.848°
   L = 0.27808

6. 6. OKLCH

   oklch(0.27808 0.02960 256.848)
   rounded: oklch(0.278 0.030 256.8)

All formats

HEX

#1f2937

RGB

rgb(31 41 55)

RGB (legacy)

rgb(31, 41, 55)

HSL

hsl(215.00 27.91% 16.86%) → hsl(215 28% 17%)

HWB

hwb(215 12% 78%)

OKLCH

oklch(0.278 0.030 256.8) · oklch(27.8% 0.030 256.8)

OKLab

oklab(0.278 -0.007 -0.029)

Lab (D50)

lab(16.14 -1.18 -10.57)

LCH (D50)

lch(16.14 10.64 263.63)

Display P3

color(display-p3 0.1294 0.1596 0.2110)

Linear sRGB

color(srgb-linear 0.0137 0.0222 0.0382)

Gamut: sRGB and Display P3

#1F2937 is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.098 and Display P3 reaches 0.125; this color uses 30% of the sRGB chroma available.

CSS snippets

.element {
  color: #1f2937;
  color: rgb(31 41 55);
  color: hsl(215 28% 17%);
  color: oklch(0.278 0.030 256.8);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.278 0.030 256.8);
}
/* arbitrary values */
class="text-[#1f2937] bg-[oklch(0.278_0.030_256.8)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1294 0.1596 0.2110); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1f2937 calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

• gray-800#1E2939
• v3 slate-800#1E293B
• slate-800#1D293D
• mist-800#22292B
• zinc-800#27272A
• neutral-800#262626
• mauve-800#2A212C
• stone-800#292524

Lighter and darker, same hue and chroma

• #2E3847 · oklch(0.338 0.030 256.8) · ΔL +0.06
• #111B28 · oklch(0.218 0.030 256.8) · ΔL −0.06

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