D10 roller
Ten faces, numbered 1 through 10.
Roll to draw new faces. Nothing is chosen yet.
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Recent rolls
Rolls you make in this visit show up here.
Each tap is a new pseudorandom draw via crypto.getRandomValues. Not atmospheric noise. How the draw works
About this page
Tens-sided dice are printed two ways. Some sets show 0 through 9 so a pair can build a percentile. Some sets show 1 through 10. This preset is 1 through 10, every time, so a lone d10 has a face for ten and does not have a face for zero. If you need 0 through 9, use the number generator with minimum 0 and maximum 9. If you need a percent from 1 to 100, use that number preset rather than pretending one d10 is a d100. Each face here is 10 percent. The expected value is 5.5. The roller can throw several d10s and add them. It does not concatenate digits into a percentile.
Related
Questions
Does this d10 include 0 or 10?
It includes 10 and excludes 0. That choice is printed on the page so a table does not discover it mid-encounter. A 0–9 die is a labeling convention for tens digits. Say which convention you are using before a result counts.
How is this different from a percent die?
A percent roll is usually two ten-sided dice, one for tens and one for ones, giving 00–99 or 1–100 depending on the table's rule. One d10 cannot do that. Rolling two dice on this page adds them. It does not place one die in the tens column. Use the 1–100 number page for a direct percent-style integer.
What is the probability of rolling a 1?
1 in 10, the same as any other face. Each roll is chosen when you press the button. Animation only reveals that draw. The browser uses crypto.getRandomValues and rejection sampling, which the methodology page spells out. This is not a loaded die, and it is not atmospheric noise. Ten rolls are not guaranteed to contain each face once. That would be sampling without replacement, and dice do not work that way.
Can a class use this for a ten-item list?
Yes, if the items are numbered and everyone can see the map from number to item. Names on a wheel are clearer when the labels are words. Numbers are clearer when the worksheet is already numbered 1 to 10. The 1–10 number page is the text version of the same span.
Why not call a 0 a 10 the way some dice do?
Because that swap is easy to misread. A die that prints 0 and means 10 is a physical convenience. A digital die can print 10 without a footnote. If your sheet says 'treat 0 as 10,' you wanted this 1–10 preset. If your sheet says '0 means zero,' you wanted 0–9 on the number tool.
What is the average?
5.5. Half the faces sit at 5 or below, half at 6 or above, and there is no single middle face. Two d10s average 11 and range from 2 to 20. Do not compare that sum with a d20. The shapes of the distributions differ even though both can show a 20 only in the two-die case.
How do I teach the 0–9 versus 1–10 difference?
Put both conventions on the board before anyone rolls. This page is the 1–10 convention, so ten is a face and zero is not. If the worksheet wants a tens digit, send the class to the number tool with minimum 0 and maximum 9 and label that column yourself. Rolling two dice here and adding them is not a percentile. Say that out loud. The confusion is labeling, and the generator will not guess which labeling you meant.