Random Number Generator 1 to 100: A Practical Guide
The default desk on Number Draw Ledger is already a random number generator 1 to 100: minimum 1, maximum 100, quantity 1. That range is popular because it maps cleanly onto percentages, percentile talk, and numbered lists with a round hundred items. This guide stays with those one hundred integers and what changes when you draw several of them or turn repeats off.
The 100 possible integers
Inclusive bounds mean the eligible set is 1, 2, 3, …, 99, 100. That is one hundred values, not ninety-nine. A result of 1 is valid. A result of 100 is valid. A result of 0 is not, unless you change the minimum. A result of 101 is not, unless you raise the maximum.
On a single draw with repeats allowed, each of those one hundred integers is designed to have probability 1/100. Seeing 42 twice in two separate clicks is allowed. It is not evidence that the generator is “stuck.”
One number or several
Generate one integer when you want a single prompt: page 17, question 64, locker 8. Raise Quantity when you want a handful. Ten numbers from 1–100 with repeats allowed can include duplicates. That is the with-replacement experiment. For practice exercises, duplicates might mean “do that problem twice,” which may be fine.
Informal selections—who speaks first among a numbered roster of 100—usually want unique values. Check Unique Numbers and keep quantity at or below 100. Asking for 100 unique values from 1–100 is a random permutation of the whole set, returned in draw order until you sort.
What unique mode changes
Without unique mode, each of the quantity slots is an independent 1–100 draw. With unique mode, later slots in the same draw cannot copy an earlier slot. Probability statements get more detailed because the remaining pool shrinks. After 37 is taken, the next unique value is uniform over the remaining 99 integers. The next click, however, starts from 100 again.
Try it on the generator or press Use Range on the 1 to 100 preset. The preset only fills the inputs. You still press Generate.
A recent result is not “due”
If 90 appeared in the last independent draw, 90 is not forbidden and 10 is not owed. Independent events do not keep a debt ledger. Short streaks look meaningful because humans notice patterns; the eligible set did not change. The same idea shows up with coins in the coin-flip article.
Classroom use: a 100-question packet. Generate one number, skip if that item is extra credit, generate again. Organizational use: a numbered attendance list. Unique ten from 1–100 picks a sample of rows. If the list has gaps, an integer can point at an empty row—the tool does not know your spreadsheet.
Copying and checking
Copy the ledger into notes. CSV is available when you want columns. History in the tab remembers recent generator operations, not a worldwide log. Clear it when you share a computer. None of these files are uploaded by the site.
If you actually need names, switch to the list picker. Mapping people to 1–100 only works if your numbering is complete and current.
Bulk generation up to 100 values is available if you want a full unique permutation of 1–100 in one click. That is a long ledger. Sort ascending if you want to scan the set; leave draw order if you want the sequence as sampled. CSV will include every row. Copy All copies the displayed order, which follows the sort control.
Negative bounds are a different instrument setting. −10 to 10 is twenty-one integers, not a variant of 1–100. Use the signed preset when you mean signed values. Mixing “I thought 100 included 0” is an inclusive-range mistake: 1–100 never includes 0. The endpoints you type are the endpoints you get.
FAQ
- Is 50 more likely than 1?
- Not on a single uniform draw over 1–100. Each eligible integer has probability 1/100.
- Can I include 0?
- Change minimum to 0. That is a different range with 101 integers if maximum stays 100.
- Why did I get the same number twice?
- Either unique mode was off, or the two numbers came from separate draws.