RGB to HEX: #0F172B

Result

Values are shown at full precision, so converting back gives exactly #0f172b. 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. base 10 → base 16

   R = 15 = 0×16 + 15 → 0F
   G = 23 = 1×16 + 7 → 17
   B = 43 = 2×16 + 11 → 2B

2. 2. pairs → HEX

   0F 17 2B → #0F172B

All formats

HEX

#0f172b

RGB

rgb(15 23 43)

RGB (legacy)

rgb(15, 23, 43)

HSL

hsl(222.86 48.28% 11.37%) → hsl(223 48% 11%)

HWB

hwb(223 6% 83%)

OKLCH

oklch(0.208 0.042 266.4) · oklch(20.8% 0.042 266.4)

OKLab

oklab(0.208 -0.003 -0.042)

Lab (D50)

lab(7.83 1.92 -14.95)

LCH (D50)

lch(7.83 15.07 277.33)

Display P3

color(display-p3 0.0653 0.0893 0.1629)

Linear sRGB

color(srgb-linear 0.0048 0.0086 0.0242)

Gamut: sRGB and Display P3

#0F172B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.141 and Display P3 reaches 0.141; this color uses 30% of the sRGB chroma available.

CSS snippets

.element {
  color: #0f172b;
  color: rgb(15 23 43);
  color: hsl(223 48% 11%);
  color: oklch(0.208 0.042 266.4);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.208 0.042 266.4);
}
/* arbitrary values */
class="text-[#0f172b] bg-[oklch(0.208_0.042_266.4)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.0653 0.0893 0.1629); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #0f172b calc(l - 0.1) c h); }

Nearby colors

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

• v3 slate-900#0F172A
• gray-900#101828
• v3 gray-900#111827
• mauve-900#1D161E
• zinc-900#18181B
• mist-900#161B1D
• neutral-900#171717
• stone-900#1C1917

Lighter and darker, same hue and chroma

• #1D253B · oklch(0.268 0.042 266.4) · ΔL +0.06
• #04091C · oklch(0.148 0.042 266.4) · ΔL −0.06

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