Numbers 1 to 30 Wheel
Spin to land on a random number from 1 to 30, each with an equal one in thirty chance. Sized for class registers, day-of-month draws and 30-item lists.
Fair by design: each spin draws from your browser’s cryptographic random number generator, giving every entry an equal 1-in-30 chance. No server is involved.
One entry per line. 30 entries on the wheel.
The entries travel in the part of the link after the #, which browsers never send to a server. Nobody, including us, can read a shared wheel from a log.
Please keep the attribution link on the last line. It is the only thing we ask in return, and it is what pays for the wheel being free.
Numbers 1 to 30 Wheel at a glance
| Slices | 30 |
|---|---|
| Chance per slice, per spin | 1 in 30 (3.3%) |
| Chance of a given slice in 10 spins | 28.8% |
| Category | Number wheels |
| Randomness source | crypto.getRandomValues, tested |
| Last updated |
About the Numbers 1 to 30 Wheel
This wheel comes pre filled and ready to spin. Give it a whirl as is, or edit the entries in the box to make it your own. Every slice has equal odds, so the result is fair each and every time. When the wheel stops, the pointer at the top marks the winning slice.
Nothing you spin is uploaded anywhere. The Numbers 1 to 30 Wheel runs entirely in your browser, and you can save your edits to your own device. When you want your visitors to spin the same wheel, copy the embed code under the wheel and drop it onto your page.
Thirty is the size of a school register, which makes this the classroom wheel for teachers who call on students by number rather than name. Spin on the board and the register number under the pointer answers the next question, with every student at an identical one in thirty chance and the fairness visible to the whole room. It is also the size of a month: spin for a random day to schedule something in, to pick a date for a draw, or to choose which day of a 30-day challenge to review. Reading groups use it for page or chapter picks, and gyms use it to pull a random workout from a 30-day plan. If your class has 26 students or your month has 28 days, delete the extra numbers in the box and the odds redistribute evenly across what remains. For no-repeat draws, remove after pick takes each called number off the wheel until everyone has had a turn.
The odds on this wheel
There are 30 slices, all the same size, so a given slice wins one spin with probability 1 ÷ 30 = 3.3%. Every spin is independent of the one before it, which means no result is ever due: after ten spins without a particular slice, the chance on the eleventh is still 3.3%.
Across several spins the maths follows the complement rule. The chance of a given slice coming up at least oncein ten spins is 1 − (1 − 1/30)10 = 28.8%. Edit the entry list and every figure here recomputes, because they are derived from the wheel rather than written down beside it.
Frequently asked questions
Why a wheel of exactly 30 numbers?
Thirty is the size of a typical class register and a month of days, so the wheel covers register draws, day-of-month picks and 30-item lists without editing.
How do I use the 1 to 30 wheel to call on students?
Give every student their register number, spin on the board, and the number under the pointer answers next. With remove after pick on, called numbers leave the wheel so everyone gets exactly one turn.
My class has fewer than 30 students. Can I trim the wheel?
Yes. Delete the unused numbers in the entry box and the odds redistribute evenly across the numbers that remain, so no spin lands on an empty seat.
Put this wheel on your own site
One line of HTML. No tracking, no cookies, and it works on any page. The embed code sits under the wheel above, and the embed guide has a copy-paste block for WordPress, Google Sites, Notion, Moodle, Canvas and OBS.
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