Numbers 1 to 20 Wheel

Numbers 1 to 20 Wheel at a glance

When to spin the Numbers 1 to 20 Wheel

A one to twenty range is one of the most common quick picks people need. Teachers use it to call on a student by seat number, coaches use it to set a drill order, and hosts use it to draw a small raffle. The wheel gives every number an equal one in twenty chance on each spin, so nobody can argue that the draw was rigged. If you need a smaller or larger range, edit the entries in the box and the wheel rebuilds instantly. You can also spin more than once to build a short shuffled list, which is handy for picking several winners in a row. Since the wheel runs entirely in your browser, you can use it offline once the page has loaded, and nothing about your draws is sent anywhere.

20 slices: odds, streaks and repeats

Each of the 20 slices wins a spin 1 in 20, or 5.0%. That sounds rare, yet repeats arrive early: by spin 6 the chance that some number has already come up twice passes 50%, the same maths as the birthday problem. Landing on every one of them, from 1 to 20, takes about 72 spins on average, which is why a no-repeat round is the quicker way to work through the whole list.

Tips for spinning it in front of a group

• At 18° per slice the labels shrink, so on a projector use Present: the wheel fills the screen and each number passing under the pointer, 1 through 20, is shown live in large type. Space or Enter spins and Esc returns to the page.
• Tick Remove after pick and each winner leaves the wheel: 20 spins work through all 20 numbers with none drawn twice, and Reset round puts 1 and the rest back.
• Selling tickets in bundles? Write "11 *3" for someone who holds three: 11 then covers 13.6% of the wheel and every other number 4.5%.

The 20 value spinner, in class and at the table

A 20 value spinner is simply a wheel with twenty outcomes, and one to twenty is the range classrooms run on: seat numbers, register numbers, the questions on a worksheet, a squad of twenty at practice. Give every student or item a number, spin on the board, and the pick is made in front of everyone with an equal 5% chance per number. Because the draw is visible, nobody suspects the teacher of picking favourites, which is the quiet reason random pickers work so well for calling on students.

For a no-repeat draw, such as working through all twenty questions in a random order, tick Remove after pick. Each winning number leaves the wheel when you close the result and the odds rebalance across what remains: 1 in 19 on the second spin, 1 in 18 on the third, until the twentieth spin has one number left and nobody has been called twice. Reset round puts every drawn number back for the next lesson. On a projector, the Present button gives a full-screen wheel where Space or Enter spins and Esc returns to the page. The classroom mode guide covers saved lists per class and the big display as well.

Using the 1 to 20 wheel as a d20

A spin matches a d20 roll exactly, one in twenty per face, so it stands in fine when the dice bag is missing. Advantage works the usual way: spin twice and keep the higher number, or keep the lower one for disadvantage. The arithmetic shows why advantage matters most at the edges. The chance of at least one natural 20 across two spins is 1 − (19/20)² = 9.75%, almost double the 5% of a single spin. For a full session the d20 roller is the better fit, with two-dice advantage rolls and running totals. And if twenty is the wrong size for your draw, the neighbouring 1 to 50 and 1 to 100 wheels scale the same fair mechanics up.

Frequently asked questions

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