random day of the month 1 to 31

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Pick a random day of the month, from 1 to 31

Thirty-one is the longest a month can be, so this range covers every possible date. Press Generate and you get a number from 1 to 31, each with a chance of one in thirty-one, about 3.2%. Use it to choose a date when nobody can agree on one.

Choosing a date at random

  • Events and get-togethers. A team dinner, a family call, a game night: let the generator pick the day, then adjust for weekends if you need to.
  • Random checks. Spot checks work best when nobody knows when they are coming. Pick the day of the month for a stock count or a safety walk.
  • Monthly draws. Some clubs pick a “lucky date” each month; a member born on that day wins a small prize.
  • Writing prompts and journals. Reread the entry from a random day of last month.

When the month is shorter

Not every month has 31 days. April, June, September and November stop at 30, and February at 28, or 29 in a leap year. If you are picking a day in one of those months, simply press again when the result does not exist. That keeps every real date equally likely. Changing a 31 into a 30 would not: it would make the 30th twice as likely as any other day.

Shared dates turn up more than you might think. Pick seven days at random with No repeats off, and the chance that two of them land on the same date is about 52%, a little more than a coin flip. If you need different dates, turn No repeats on.

For a whole year rather than a month, the 1 to 365 page picks a day of the year.

Picking several numbers from 1 to 31

31 possible numbers. What changes when you pick more than one at a time:

Numbers pickedA given number is among them (No repeats on)At least one number twice (No repeats off)
13.2%0%
26.5%3.2%
39.7%9.5%
516.1%28.8%
1032.3%80.4%
2064.5%99.97%

How it works

  1. The range is set

    The lowest and highest numbers for this page are already in the sentence at the top, and both can come up. Nothing to type before your first pick.

  2. Pick your number

    Press Generate or the Space bar, or tap the number. The reel rolls like a slot machine and stops on the result.

  3. Change it if you need to

    Tap how many numbers you want in the sentence to get up to 20 at once; No repeats keeps them all different. Tap either end of the range to type a new one.

Any suggestions for improvement?

We build tools that are as simple and intuitive as possible, with a few bonuses here and there. Tell us what would make this one better.

Ready-made versions

Random numberNumber 1 to 100Number 1 to 10Number 1 to 6Number 1 to 20Number 1 to 50Number 1 to 1000Number 1 to 3Number 1 to 4Number 1 to 5Number 1 to 8Number 1 to 12Number 1 to 15Number 1 to 25Number 1 to 30Number 1 to 40Number 1 to 49Number 1 to 52Number 1 to 60Number 1 to 75Number 1 to 90Number 1 to 200Number 1 to 365Number 1 to 5001 to 10,000

Questions

How do I pick a random date in February?

Press Generate and, if the number is higher than 28 (or 29 in a leap year), press again. Every real day of February stays equally likely.

What is the chance of a given day from 1 to 31?

One in thirty-one, about 3.2%. The 31st is exactly as likely as the 1st.

Can I pick several different days at once?

Yes. Tap “a number”, choose how many days you need and turn on No repeats so no date comes up twice.

Is the random number generator free?

Yes. It is free to use, funded by advertising, with no account and no app to install.

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