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Free Gacha, Blind Box & Prize Odds Calculators
Calculate your chance of getting a target item from gacha pulls, blind boxes, random boosters, Ichiban Kuji-style prize draws, and collectible packs.
At least one target 26.26%
No target 73.74%
Use the same core probability formula across gacha pulls, blind boxes, boosters, and independent attempts.
P = 1 - (1 - r)^n Popular calculators
Choose the tool that matches how the item is drawn: independent pulls, blind boxes, random packs, or a shrinking prize pool.
Gacha Calculator
Estimate the chance of getting at least one target item after a set number of gacha pulls. Enter the listed drop rate, your planned pulls, and an optional cost per pull.
Blind Box Calculator
Estimate your chance of pulling a specific figure, secret item, or any design you want from a blind box series.
Ichiban Kuji Calculator
Calculate the chance of drawing at least one target prize from a remaining prize pool where tickets are removed after each draw.
Random Booster Calculator
Estimate the odds of pulling a desired variant from random booster packs, collectible toy packs, or mystery assortments.
At Least One Success
Use this general probability tool for any repeated chance event: pulls, boxes, prize entries, packs, or attempts with the same success rate.
Expected Cost
Estimate the expected number of attempts for one success and the cost to reach a chosen probability target.
How probability calculators work
Most random pulls are easier to understand by first calculating the chance of missing every attempt. If a pull has a 3% success rate, the miss rate is 97%. Ten misses in a row are calculated as 0.97 to the 10th power. The chance of at least one success is whatever remains.
Prize pool draws are different. When tickets are removed after each draw, the calculator must use a without-replacement model. That is why the Ichiban Kuji-style tool asks for remaining tickets and target prizes instead of a simple drop rate.
Core formula
P = 1 - (1 - r)^n r = single attempt success rate, n = attempts, P = chance of at least one success.
Example calculation
If the drop rate is 3% and you make 10 pulls, the chance of getting at least one target item is about 26.26%. The chance of not getting it is still about 73.74%. That is the part many people underestimate when they only look at the single-pull rate.
This is why PrizeOdds Calculator always shows both sides: the hit chance and the miss chance. Seeing the cost beside the probability can make it easier to decide whether to pull now, wait, trade, buy directly, or skip.
Responsible use
Probability can help you understand risk, but it cannot guarantee a win. If you are buying pulls, boxes, or prize tickets, set a budget first and avoid spending more than you can afford.
Why use PrizeOdds Calculator
The site is built for quick checks before spending, collecting, trading, or comparing random-buy options.
Right model for the draw
Independent pulls and without-replacement prize pools are handled differently.
No login required
All calculations run locally in the browser and work on mobile.
Guides for better odds decisions
Use the calculators with plain-English explanations, examples, and responsible collecting advice.
How Gacha Probability Works
Learn how gacha probability works, why repeated pulls do not add up directly, and how to read at least-one-success odds.
Blind Box Odds Explained
Understand blind box odds, equal variant assumptions, secret item limits, duplicate risk, and how to compare boxes with resale prices.
Prize Draw Odds Without Replacement
Learn why prize draws with removed tickets need without-replacement probability and how remaining pool counts change your odds.
Expected Cost vs Guaranteed Result
Understand expected cost, why it does not guarantee success, and how to use target probability when planning random purchases.
Responsible Collecting Budget Guide
A practical guide to setting a budget for gacha pulls, blind boxes, random boosters, and prize tickets before buying.
Calculator Methodology
Review the formulas, assumptions, limitations, and editorial approach used by PrizeOdds Calculator.
FAQ
Are these calculators free to use?
Yes. PrizeOdds Calculator is a free browser-based toolkit for estimating collectible odds, pull chances, and expected cost.
Do the calculators guarantee my result?
No. Probability estimates explain risk, but random outcomes can still miss even when the displayed chance is high.
Which calculator should I use for a prize pool with tickets removed?
Use the Ichiban Kuji-style odds calculator because it handles draws without replacement from a shrinking pool.
Is this website affiliated with any game or toy brand?
No. PrizeOdds Calculator is independent and does not claim affiliation with any game, toy, anime, lottery, or prize draw brand.