Recognised as Colour
#F8151B
- #F8151B
- Red
- Dark
- Nearest: Red
#F8151B is a red with RGB values 248, 21, 27 and HSL 358°, 94%, 53%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#F8151B#F8151B
HEX#F8151B
RGBrgb(248, 21, 27)
RGB (0–1)0.9725, 0.0824, 0.1059
RGB percentages97.3%, 8.2%, 10.6%
HSLhsl(358.4, 94.2%, 52.7%)
HSV / HSBhsv(358.4, 91.5%, 97.3%)
CMYK0%, 91.5%, 89.1%, 2.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,258,331
CSS custom property--colour: #F8151B;
Brightness & contrast
Relative luminance0.20572WCAG 2.x, 0 is black and 1 is white
Perceived brightness136.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.11:1
Contrast with white4.11:1WCAG normal text: Fail
Contrast with black5.11:1WCAG normal text: AA
Greyscale equivalent#464646
Inverted#07EAE4
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.11:1WCAG large text: AA
Contrast with black, large text5.11:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#15F8F2
Analogous#F8158D, #F88115
Triadic#1BF815, #151BF8
Split complementary#15F881, #158DF8
Tetradic#8CF815, #15F8F2, #8015F8
Tints, shades & saturation
Channel breakdown
R248
G21
B27
Red248 (97.3%)
Green21 (8.2%)
Blue27 (10.6%)
Hue358.41°
Saturation (HSL)94.19%
Lightness52.75%
Dominant channelRed
Hex per channelR F8 · G 15 · B 1B
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Also reads as
F8151B (chemical formula)
- Formula
- 154,863.508 g/mol
- 8152 atoms
F8151B has a molar mass of 154,863.508 g/mol, made up of 8152 atoms across 2 elements: 8151 × F, 1 × B.
Molar mass
Molar mass154,863.508 g/mol
Total atoms per molecule8152
Distinct elements2
Mass of one molecule2.5715691 × 10^-19 g
Molecules per gram3.8886764 × 10^18
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
F100%
B0%
Fluorine (F × 8151)154,852.698 g/mol, 99.993%
Boron (B)10.81 g/mol, 0.007%
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page