Recognised as Colour
#FB2803
- #FB2803
- Red
- Dark
- Nearest: Red
#FB2803 is a red with RGB values 251, 40, 3 and HSL 9°, 98%, 50%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#FB2803#FB2803
HEX#FB2803
RGBrgb(251, 40, 3)
RGB (0–1)0.9843, 0.1569, 0.0118
RGB percentages98.4%, 15.7%, 1.2%
HSLhsl(9, 97.6%, 49.8%)
HSV / HSBhsv(9, 98.8%, 98.4%)
CMYK0%, 84.1%, 98.8%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,459,779
CSS custom property--colour: #FB2803;
Brightness & contrast
Relative luminance0.22033WCAG 2.x, 0 is black and 1 is white
Perceived brightness140.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.41:1
Contrast with white3.88:1WCAG normal text: Fail
Contrast with black5.41:1WCAG normal text: AA
Greyscale equivalent#525252
Inverted#04D7FC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.88:1WCAG large text: AA
Contrast with black, large text5.41:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#03D6FB
Analogous#FB035A, #FBA403
Triadic#03FB28, #2803FB
Split complementary#03FBA4, #035AFB
Tetradic#5AFB03, #03D6FB, #A403FB
Tints, shades & saturation
Channel breakdown
R251
G40
B3
Red251 (98.4%)
Green40 (15.7%)
Blue3 (1.2%)
Hue8.95°
Saturation (HSL)97.64%
Lightness49.8%
Dominant channelRed
Hex per channelR FB · G 28 · B 03
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Also reads as
FB2803 (chemical formula)
- Formula
- 30,319.428 g/mol
- 2804 atoms
FB2803 has a molar mass of 30,319.428 g/mol, made up of 2804 atoms across 2 elements: 1 × F, 2803 × B.
Molar mass
Molar mass30,319.428 g/mol
Total atoms per molecule2804
Distinct elements2
Mass of one molecule5.0346595 × 10^-20 g
Molecules per gram1.9862317 × 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
F0.1%
B99.9%
Fluorine (F)18.998 g/mol, 0.063%
Boron (B × 2803)30,300.43 g/mol, 99.937%
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