Recognised as Dice notation

1d21

1d21
1 to 21
mean 11

Rolling 1d21 gives a total between 1 and 21, with a mean of 11 and a standard deviation of 6.0553. There are 21 equally likely ordered outcomes, and the most likely total is 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20 or 21 at 4.762%.

The canonical address for this page is /1d21.

The roll

Notation1d21

Dice1

Faces per die21

Minimum total1a 1

Maximum total21all 1 dice showing 21

Distinct totals21

Mean11n(f + 1)/2 + modifier, exact

Variance36.66666667n(f² − 1)/12, exact

Standard deviation6.05530071≈

Counting the outcomes

Ordered outcomes2121^1, every die distinguishable

Most likely total1 and 2 and 3 and 4 and 5 and 6 and 7 and 8 and 9 and 10 and 11 and 12 and 13 and 14 and 15 and 16 and 17 and 18 and 19 and 20 and 21two totals share the peak

Chance of that total4.761905%≈

Ways to roll it1exact count

Chance of the minimum4.76190476%≈1 in 21

Chance of the maximum4.76190476%≈1 in 21

Probability of each total

Exact counts, by enumeration over every combination.

14.76%

24.76%

34.76%

44.76%

54.76%

64.76%

74.76%

84.76%

94.76%

104.76%

114.76%

124.76%

134.76%

144.76%

154.76%

164.76%

174.76%

184.76%

194.76%

204.76%

214.76%

14.7619%1 way

24.7619%1 way

34.7619%1 way

44.7619%1 way

54.7619%1 way

64.7619%1 way

74.7619%1 way

84.7619%1 way

94.7619%1 way

104.7619%1 way

114.7619%1 way

124.7619%1 way

134.7619%1 way

144.7619%1 way

154.7619%1 way

164.7619%1 way

174.7619%1 way

184.7619%1 way

194.7619%1 way

204.7619%1 way

214.7619%1 way

Chance of rolling at least

390.4762%≈

676.1905%≈

1152.381%≈

1628.5714%≈

1914.2857%≈

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

The same dice, different counts

The same count, different dice

Also reads as

#D00021 (colour)

#D00021
Red
Dark
Nearest: Crimson

#D00021 is a red with RGB values 208, 0, 33 and HSL 350°, 100%, 41%. It is a dark colour, so white text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Crimson.

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Colour values

#D00021#D00021

HEX#D00021

RGBrgb(208, 0, 33)

RGB (0–1)0.8157, 0, 0.1294

RGB percentages81.6%, 0%, 12.9%

HSLhsl(350.5, 100%, 40.8%)

HSV / HSBhsv(350.5, 100%, 81.6%)

CMYK0%, 100%, 84.1%, 18.4%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,631,521

CSS custom property--colour: #D00021;

Brightness & contrast

Relative luminance0.1352WCAG 2.x, 0 is black and 1 is white

Perceived brightness114.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.67:1

Contrast with white5.67:1WCAG normal text: AA

Contrast with black3.7:1WCAG normal text: Fail

Greyscale equivalent#2F2F2F

Inverted#2FFFDE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#564D1Fno red cones; affects about 1% of men; ΔE 74.6 from the original

Deuteranopia#837515no green cones; the most common form, about 1% of men; ΔE 74.5 from the original

Tritanopia#E60015no blue cones; rare, and affects men and women equally; ΔE 13.1 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text5.67:1WCAG large text: AAA

Contrast with black, large text3.7:1WCAG large text: AA

Named colours

Crimson · ΔE 11.7 Firebrick · ΔE 15.6 Tomato · ΔE 21.9 Dark red · ΔE 24 Brown · ΔE 24.7 Red · ΔE 26.9

Nearest named CSS colourCrimson (#DC143C)ΔE 11.67, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#00D0AF

Analogous#D00089, #D04700

Triadic#21D000, #0021D0

Split complementary#00D047, #0089D0

Tetradic#89D000, #00D0AF, #4700D0

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FF9DAD

Lighter +30%#FF6A82

Lighter +20%#FF3757

Lighter +10%#FF042C

Darker −10%#9D0019

Darker −20%#6A0011

Darker −30%#370009

Darker −40%#040001

More saturated +25%#D00021

Less saturated −25%#B61A33

Channel breakdown

R208

B33

Red208 (81.6%)

Green0 (0%)

Blue33 (12.9%)

Hue350.48°

Saturation (HSL)100%

Lightness40.78%

Dominant channelRed

Hex per channelR D0 · G 00 · B 21

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

1d21

The roll

Counting the outcomes

Probability of each total

Chance of rolling at least

Keep nerding

The same dice, different counts

The same count, different dice

#D00021 (colour)

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

Nerdulate something else