#a90000

Color #a90000

A vivid, highly saturated dark red.

Closest named color Firebrick #b22222 · ΔE 12.61 Nearest Tailwind class red-800 #9f0712 · ΔE 4.1

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#a90000

RGB

rgb(169, 0, 0)

HSL

hsl(0, 100%, 33.1%)

HSV / HSB

hsv(0, 100%, 66.3%)

CMYK

cmyk(0%, 100%, 100%, 33.7%)

LAB

lab(34.88, 58.85, 49.16)

LCH

lch(34.88, 76.68, 39.87)

OKLCH

oklch(46.1%, 0.1893, 29.25)

HWB

hwb(0, 0%, 33.7%)

Harmony colors

Complementary

#00a9a9

Analogous

#a90054

#a90000

#a95400

Triadic

#a90000

#00a900

#0000a9

Split-complementary

#a90000

#00a954

#0054a9

Tetradic

#a90000

#a9a900

#00a9a9

#0000a9

Square

#a90000

#54a900

#00a9a9

#5400a9

Shades

Color #a90000 mixed toward black.

#8d0000

#710000

#540000

#380000

#1c0000

Tints

Color #a90000 mixed toward white.

#e20000

#ff1c1c

#ff5454

#ff8d8d

#ffc6c6

Tones

Color #a90000 mixed toward gray.

#9b0e0e

#8d1c1c

#7f2a2a

#713838

#624646

Accessibility

Aa White text on this color

7.82:1

Aa Black text on this color

2.69:1

White text reads better on this background (7.82:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#828200 · ΔE 47.2

Deuteranopia

#889000 · ΔE 52.1

Tritanopia

#a50000 · ΔE 0.8

Achromatopsia

#525252 · ΔE 28.2

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #a90000;

Tailwind (arbitrary value)

bg-[#a90000]

Related colors

Red #ff0000

Maroon #800000

Black #000000

Brown #a52a2a

Dark Gray #a9a9a9

Dark Red #8b0000

Frequently asked questions

#a90000 (#a90000) is rgb(169, 0, 0) in RGB.

No, #a90000 is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

Try it → Accessibility

Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

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Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

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Build something with this color

Generate a full palette from #a90000, or check how it holds up for accessibility.

Generate a palette → Check contrast