What color is #645B55?

#645B55 is a dark, grayish orange, closest to the named color Caveman. It belongs to the gray family of colors.

What is the RGB value of #645B55?

The RGB value is 100, 91, 85: 100 red, 91 green and 85 blue on a 0 to 255 scale.

What is the complementary color of #645B55?

The complementary color is #555E64, found by rotating the hue 180° on the color wheel.

Is black or white text better on #645B55?

White text. Black text has a contrast ratio of 3.17:1 and white text 6.63:1. WCAG asks for at least 4.5:1 for normal text.

#645B55 color

#645B55 rgb(100, 91, 85)

Shades of gray

The hex color #645B55 is a dark, grayish orange.

In the RGB color model it is made of 39.2% red, 35.7% green and 33.3% blue (100, 91, 85).

Its hue angle is 24°, with 8% saturation and 36% lightness. For print, the CMYK equivalent is 0% cyan, 9% magenta, 15% yellow and 61% black.

The closest named color is Caveman (#625C58), a difference of 1.7 ΔE, which is barely visible.

White text is the more readable choice on this background (contrast 6.63:1).

#645B55 color codes

HEX	`#645B55`
RGB	`rgb(100, 91, 85)`
RGB percent	`rgb(39.2%, 35.7%, 33.3%)`
HSL	`hsl(24, 8%, 36%)`
HSV / HSB	`hsv(24, 15%, 39%)`
CMYK	`cmyk(0%, 9%, 15%, 61%)`
CIE LAB	`lab(39.32, 2.49, 4.77)`
CIE LCH	`lch(39.32, 5.38, 62.47)`
CIE XYZ	`xyz(10.636, 10.848, 10.126)`
Decimal	`6576981`
Short hex	`None (no 3-digit form)`

Color harmonies

Colors that go with #645B55, based on their position on the color wheel.

Complementary

The color opposite on the color wheel (180°). Strongest contrast.

Analogous

Neighbors 30° either side. Calm, natural combinations.

Split complementary

The two colors next to the complement (150° and 210°).

Triadic

Three colors evenly spaced, 120° apart.

Tetradic (square)

Four colors 90° apart.

Shades, tints and tones

Shades (darker, mixed with black)

Tints (lighter, mixed with white)

Tones (mixed with gray)

Contrast and accessibility

Text on #645B55	Ratio	AA	AAA	AA large
Sample text	3.17:1	Fail	Fail	Pass
Sample text	6.63:1	Pass	Fail	Pass

#645B55 as text on	Ratio	AA	AAA	AA large
Sample text	6.63:1	Pass	Fail	Pass
Sample text	3.17:1	Fail	Fail	Pass

WCAG 2 asks for 4.5:1 for normal text (AA), 7:1 for AAA, and 3:1 for large text. Check other pairs.

Color blindness simulation

How #645B55 looks to people with the most common types of color vision deficiency.

CSS examples

.background { background-color: #645b55; }
.text { color: #645b55; }
.border { border: 2px solid #645b55; }
.transparent { background-color: rgb(100 91 85 / 50%); }
.gradient { background: linear-gradient(to right, #645b55, #646355); }

Background

Text color

Border

Similar colors

Closest common color name: Umber.

Questions

What color is #645B55?: #645B55 is a dark, grayish orange, closest to the named color Caveman. It belongs to the gray family of colors.
What is the RGB value of #645B55?: The RGB value is 100, 91, 85: 100 red, 91 green and 85 blue on a 0 to 255 scale.
What is the complementary color of #645B55?: The complementary color is #555E64, found by rotating the hue 180° on the color wheel.
Is black or white text better on #645B55?: White text. Black text has a contrast ratio of 3.17:1 and white text 6.63:1. WCAG asks for at least 4.5:1 for normal text.