Recognised as Colour
#F51313
- #F51313
- Red
- Dark
- Nearest: Red
#F51313 is a red with RGB values 245, 19, 19 and HSL 0°, 92%, 52%. It is a dark colour, so black text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#F51313#F51313
HEX#F51313
RGBrgb(245, 19, 19)
RGB (0–1)0.9608, 0.0745, 0.0745
RGB percentages96.1%, 7.5%, 7.5%
HSLhsl(0, 91.9%, 51.8%)
HSV / HSBhsv(0, 92.2%, 96.1%)
CMYK0%, 92.2%, 92.2%, 3.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,061,203
CSS custom property--colour: #F51313;
Brightness & contrast
Relative luminance0.19925WCAG 2.x, 0 is black and 1 is white
Perceived brightness134.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.99:1
Contrast with white4.21:1WCAG normal text: Fail
Contrast with black4.99:1WCAG normal text: AA
Greyscale equivalent#434343
Inverted#0AECEC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.21:1WCAG large text: AA
Contrast with black, large text4.99:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#13F5F5
Analogous#F51384, #F58413
Triadic#13F513, #1313F5
Split complementary#13F584, #1384F5
Tetradic#84F513, #13F5F5, #8413F5
Tints, shades & saturation
Channel breakdown
R245
G19
B19
Red245 (96.1%)
Green19 (7.5%)
Blue19 (7.5%)
Hue0°
Saturation (HSL)91.87%
Lightness51.76%
Dominant channelRed
Hex per channelR F5 · G 13 · B 13
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Also reads as
F51313 (chemical formula)
- Formula
- 974,844.374 g/mol
- 51313 atoms
F51313 has a molar mass of 974,844.374 g/mol, made up of 51313 atoms across 1 element: 51313 × F.
Molar mass
Molar mass974,844.374 g/mol
Total atoms per molecule51313
Distinct elements1
Mass of one molecule1.6187672 × 10^-18 g
Molecules per gram6.1775407 × 10^17
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%
Fluorine (F × 51313)974,844.374 g/mol, 100%
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