条件付き確率計算機
他のイベントが発生したことを前提として、あるイベントが発生する確率を計算します。
条件付き確率計算機 gives you a faster way to work through practical calculation scenarios without rebuilding the same calculation from scratch every time. Start with イベントAの確率（P（A））, イベントBの確率（P（B））, and AとBの確率（P（AとB）） and use the live outputs to estimate Bが与えられた場合のAの確率（P（A | B）） and Aが与えられた場合のBの確率（P（B | A）） in one pass. This page is built to help you compare scenarios quickly, validate rough assumptions, and move into a related calculator when you need a second angle on the same problem.
Use The Calculator In A Few Steps
Work through the inputs deliberately, then compare outputs instead of relying on a single scenario.
Scenario Checks
Use these examples to verify the behavior of the calculator before you run your own values.
What Users Usually Need Next
Keep the calculator open while you skim these answers so you can test the scenario that matters.
Related Calculators
These links are chosen to deepen the session and answer the next likely question without sending the user back to search.