Charcoal
#003F66 · Charcoal
#003F66 is Charcoal, a cool blue color. It has an RGB value of 0, 63, 102 and a relative luminance of 0.045, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.05
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
11.04:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.90:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #003F66?
#003F66 is Charcoal, a cool blue color. In RGB it is 0, 63, 102, and in HSL it is 203°, 100%, 20%.
Is #003F66 a light or dark color?
#003F66 has a relative luminance of 0.045, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #003F66?
Its complementary color is #662700. For softer combinations, try the analogous or split-complementary harmonies shown above.