Recognised as Colour
#FB4038
- #FB4038
- Red
- Dark
- Nearest: Tomato
#FB4038 is a red with RGB values 251, 64, 56 and HSL 2°, 96%, 60%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Tomato.
Colour values
#FB4038#FB4038
HEX#FB4038
RGBrgb(251, 64, 56)
RGB (0–1)0.9843, 0.251, 0.2196
RGB percentages98.4%, 25.1%, 22%
HSLhsl(2.5, 96.1%, 60.2%)
HSV / HSBhsv(2.5, 77.7%, 98.4%)
CMYK0%, 74.5%, 77.7%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,465,976
CSS custom property--colour: #FB4038;
Brightness & contrast
Relative luminance0.24462WCAG 2.x, 0 is black and 1 is white
Perceived brightness147 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.89:1
Contrast with white3.56:1WCAG normal text: Fail
Contrast with black5.89:1WCAG normal text: AA
Greyscale equivalent#676767
Inverted#04BFC7
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.56:1WCAG large text: AA
Contrast with black, large text5.89:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#38F3FB
Analogous#FB3892, #FBA138
Triadic#38FB40, #4038FB
Split complementary#38FBA1, #3892FB
Tetradic#92FB38, #38F3FB, #A138FB
Tints, shades & saturation
Channel breakdown
R251
G64
B56
Red251 (98.4%)
Green64 (25.1%)
Blue56 (22%)
Hue2.46°
Saturation (HSL)96.06%
Lightness60.2%
Dominant channelRed
Hex per channelR FB · G 40 · B 38
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Also reads as
FB4038 (chemical formula)
- Formula
- 43,669.778 g/mol
- 4039 atoms
FB4038 has a molar mass of 43,669.778 g/mol, made up of 4039 atoms across 2 elements: 1 × F, 4038 × B.
Molar mass
Molar mass43,669.778 g/mol
Total atoms per molecule4039
Distinct elements2
Mass of one molecule7.2515372 × 10^-20 g
Molecules per gram1.3790179 × 10^19
Name
NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show
Composition by mass
F0%
B100%
Fluorine (F)18.998 g/mol, 0.044%
Boron (B × 4038)43,650.78 g/mol, 99.956%
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