Charcoal
#660000 · Charcoal
#660000 is Charcoal, a warm red color. It has an RGB value of 102, 0, 0 and a relative luminance of 0.028, making it a dark surface.
Temperature
☀ Warm
Hue family
red
Luminance
0.03
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
13.42:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.56:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #660000?
#660000 is Charcoal, a warm red color. In RGB it is 102, 0, 0, and in HSL it is 0°, 100%, 20%.
Is #660000 a light or dark color?
#660000 has a relative luminance of 0.028, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #660000?
Its complementary color is #006666. For softer combinations, try the analogous or split-complementary harmonies shown above.