Random Number Generator 1 5
Pick one of five numbered options or generate an order for turns. Single picks and the 1,000-pick action always allow repeats. No-repeat lists sample without replacement and are excluded from the independent-pick tally. Small samples need not look balanced.
- Free to use
- No sign-up
- Runs in your browser
Random number 1–5
Whole-number endpoints ±1,000,000,000; at most 1,000,000 possible values, 10,000 list entries and 100,000 tallied independent picks. Changing the range resets results.
Probability Classroom Pack
Optional classroom pack: a five-question experiment, a manual tally table, a probability vocabulary sheet and a ten-question practice set with answer keys. Includes four PDFs, two editable Word files, one manual Excel table and a README; no automatic chart or spreadsheet formulas.
- Experiment PDF and editable Word file
- Tally PDF and manual Excel table
- Probability vocabulary PDF
- Practice PDF and editable Word file
- README
Formats: PDF, DOCX, XLSX. Instant download after payment (link valid 72 hours, up to 5 downloads). AI-assisted: AI tools were used to help draft these materials.
$5.00 USD, one-time
- Instant download
- 7-day refund
- Secure checkout by Stripe
7-day money-back guarantee. Full refund within 7 days of purchase, even after you download.
Full refund within 7 days — see the refund policy and license.
Free printables
Single sheets you can print right now, no sign-up. The full pack adds every sheet in one download plus the editable files.
Probability practice (free PDF)How selection works
The tool calls browser crypto.getRandomValues and rejects the upper raw values that would introduce modulo bias. If the source throws or repeatedly returns rejected values, the action fails without saving partial picks. This is not a certified lottery, security-key generator or audit trail.
Using the tool
- Keep From=1 and To=5 for five options; endpoints must be integers, ordered and within the displayed bounds.
- Choose a list length from 1 to 10,000. For no repeats it cannot exceed the range size.
- No-repeat lists are shuffled samples, not independent trials, and do not enter the tally.
- Changing the range resets counts and results. Other setting changes clear the last list. Reset all clears both.
- Copy the latest list; if clipboard access fails, select the visible text instead.
Reading the tally
Counts accumulate only from single picks, the 1,000-pick action and lists with repeats. Frequency rows are shown for ranges of at most 30 values. A chi-square approximation is displayed only for range 1–5 after at least 25 independent picks (expected count at least 5 each), following the sample-size guidance in the NIST reference. A high p-value does not prove fairness or independence; repeated checking changes how surprising a small p-value is.
Worked example
For counts 192, 211, 197, 204, 196, total 1,000 and expected 200 each, chi-square is 1.13 with four degrees of freedom and approximate p = 0.8895. This is an illustrative calculation, not evidence about your browser random source.
Probability with five outcomes
| Question | Probability |
|---|---|
| Getting a 3 on one pick | 1/5 = 20% |
| Getting an even number (2 or 4) | 2/5 = 40% |
| Two picks both 5 | 1/25 = 4% |
| Two picks the same number | 1/5 = 20% |
| Three picks all different | (5 × 4 × 3)/125 = 48% |
| No 1 in five picks | (4/5)⁵ ≈ 32.8% |
These probabilities assume independent uniform draws with replacement. In 20 draws, the chance of at least one adjacent equal pair is 1 − (4/5)^19 ≈ 98.56%. A repeated result does not make another value due next.
Optional classroom files
The paid pack contains a five-question experiment worksheet, a manual tally table (PDF and XLSX), a vocabulary PDF and ten practice questions with answer keys (PDF and DOCX). No prebuilt bar-chart graphic, automatic spreadsheet formulas or generator unlock is included.
Free alternative
RANDOM.ORG’s integer generator provides configurable random integer lists. A one-off number pick does not require buying this classroom pack.
Privacy scope
The generator code computes numbers on this device and keeps the tally in page memory; it makes no network request to draw numbers. This is a statement about this tool code, not a claim that the whole site has no analytics or server logs.
Frequently asked questions
Can I generate numbers without repeats?
Yes, set How many no larger than the range size and choose No repeats. Such lists are excluded from the independent tally.
Does a high p-value prove the generator is fair?
No. The displayed approximation is an educational summary for 1–5 only, not certification or a test of independence.
Are the classroom files needed to use the generator?
No. The generator is free; the optional files are manual printable teaching materials.