Lottery simulator (Japan Jumbo Takarakuji)
See what happens when you buy lots of Year-End Jumbo tickets as consecutive or random sets. Wins for each prize, money spent and money back, plus a 3D draw machine.
Buy 10 tickets and check them all against one draw.
Everything runs on this device. Draw results and your history are saved only in this browser.
Results so far
You haven't bought any tickets yet. Draw and the results will add up here.
Every draw is independent and random, and past results never change your chances. This is not a tool for predicting winners. It is for seeing the odds for yourself, and how the losses grow the more you buy.
Based on the official number of prizes, the average return is 50.0% (¥150 per ticket). Prize amounts and numbers of prizes are from the official table of the 2025 Year-End Jumbo Takarakuji (draw No. 1082). Every prize is a fixed amount.
Everything runs on this device. Draw results and your history are saved only in this browser.
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How to use
1. Choose how to buy and how many, then draw
In the panel below the draw, choose “Consecutive”, “Random” or “My number” under “How to buy” and choose “Tickets to buy”, then scroll back up and tap “Buy and draw”. Your tickets appear, the draw machine spins once, and when it stops, all your tickets are checked against that draw's winning numbers. Winning tickets get a stamp.
In the panel on the right, choose “Consecutive”, “Random” or “My number” under “How to buy” and choose “Tickets to buy”, then press “Buy and draw” on the left. Your tickets appear, the draw machine spins once, and when it stops, all your tickets are checked against that draw's winning numbers. Winning tickets get a stamp.
2. See the results so far and the chart
“Results so far” below shows the tickets bought, the return rate, how many years of weekly buying that equals, a chart of the net over time, and the wins and the official and actual odds for each prize. The dotted line in the chart is where the net would be if it followed the expected value.
“Results so far” below the draw shows the tickets bought, the return rate, how many years of weekly buying that equals, a chart of the net over time, and the wins and the official and actual odds for each prize. The dotted line in the chart is where the net would be if it followed the expected value.
3. Keep going, or draw until the 1st prize
Choose “Keep going” under “Repeat” and tap “Buy and draw” to keep drawing with the same number of tickets until you tap “Stop”. “Until 1st prize” fast-forwards through draws, stops at the draw that wins the 1st prize, and shows how many draws it took and how much you spent.
Choose “Keep going” under “Repeat” and press “Buy and draw” to keep drawing with the same number of tickets until you press “Stop”. “Until 1st prize” fast-forwards through draws, stops at the draw that wins the 1st prize, and shows how many draws it took and how much you spent.
Good for
Seeing how often you'd win before buying Year-End Jumbo tickets
Try buying 10,000 or 1 million tickets and you'll see the gap between the money spent and the money back right away.
People wondering whether to buy lottery tickets
Comparing consecutive (renban) and random (bara) sets
Buy the same number of tickets as consecutive and random sets and compare. You can also see the difference in the results: adjacent-number prizes come with consecutive sets, and a random set always wins a 7th prize.
People deciding how to buy
Showing probability and expected value in class
The official odds and the actual odds sit side by side, so you can show how they get closer the more you try. The draw machine can be shown large in full screen.
Teachers and instructors
Seeing for fun what it would cost to keep buying until you win 1st prize
Choose “Until 1st prize” and it keeps buying until you win, then shows the money spent and how many years of weekly buying that equals.
People who like playing with numbers
Good to know before you start
- This is not a tool for predicting winning numbers. It has nothing to do with the results of the real draw.
- You can't buy lottery tickets here. Please don't use it for betting money, either.
- Prize amounts and numbers of prizes are from the 2025 Year-End Jumbo table. Other Jumbo lotteries (Dream, Summer and so on) have different prizes.
The odds of winning, and the money you get back
In the Year-End Jumbo, one unit is 20 million tickets made of a group (01 to 200) and a 6-digit number (100000 to 199999), and each unit has one 1st prize. A ticket costs ¥300, and based on the official number of prizes, about half of sales (about ¥150 per ticket) comes back as prize money. The more you buy, the bigger the gap between the money spent and the money back.
For every draw, this simulator first decides the winning numbers with the browser's cryptographic random numbers (crypto.getRandomValues), then checks all the tickets you bought for that draw. Even with 1 million tickets there is only one draw, just like the real lottery. The draw machine's motion just shows a result that has already been decided. Each draw has nothing to do with the one before, and a losing streak never makes the next win more likely.
Frequently asked questions
Answers to things people often wonder about before using it.
Are the numbers I pick or my results sent anywhere?
No. The draws and the totals all happen inside the browser on your device. Results stay only in this browser.
Can it predict winning numbers?
No. Every draw is independent and random, and has nothing to do with the real draw. A losing streak never makes the next win more likely.
What are the odds of winning 1st prize?
1 in 20 million per ticket. Even including the adjacent-number prizes, it's about 1 in 6.7 million per ticket. Choose “Until 1st prize” to see how many tickets it takes to win.
Which wins more often, consecutive or random sets?
The odds per ticket are the same for both. With a consecutive set you can sometimes win the 1st prize and the adjacent-number prizes together, and a random set always covers last digits 0 to 9, so one ticket always wins the 7th prize (¥300).
What is the return rate?
Based on the official number of prizes, about 50%. That means on average about ¥150 comes back as prize money for each ¥300 ticket. When you actually try it, the result swings a lot depending on whether a big prize comes up.
Is the prize money the same as the real thing?
It matches the official table of the 2025 Year-End Jumbo Takarakuji (draw No. 1082). Jumbo prizes are all fixed amounts and don't change with the number of tickets sold.
Can one ticket win two prizes?
Yes. For example, a 1st prize ticket also wins the 7th prize if its last digit matches the 7th prize number. Just like the real lottery, both prize amounts are added together.
Does the draw machine's motion decide the result?
No. The result is decided first with cryptographic random numbers, and the draw machine just moves so the arrow lands on that result. If your reduce-motion setting is on, it shows the result right away without spinning.
Won't it freeze with 1 million tickets or “Until 1st prize”?
Checking the tickets runs separately from the screen and finishes while the draw machine spins, so the screen doesn't freeze. “Until 1st prize” fast-forwards, and you can stop at any time with “Stop”.
Is it free?
Yes. No sign-up is needed and there are no ads. There are no links to lottery sales sites, either.
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