Probability Calculator

About This Tool

So, you need to figure out the odds of something happening—maybe it’s drawing a red card from a deck, guessing the right number in a raffle, or even whether your friend will actually show up on time (spoiler: probably not). That’s where this Probability Calculator comes in. It’s not flashy, doesn’t have a million features, and won’t give you life advice. But it does one thing well: it helps you calculate the likelihood of events based on basic probability rules. I built this because I kept getting tired of doing mental math every time I wanted to check if my “sure thing” bet was actually worth it. Whether you’re a student, a casual gambler, or just someone who likes to know the odds before making a decision, this tool keeps it simple. No jargon, no nonsense—just input your numbers and get a clear answer.

Key Features

• Simple input fields – Enter the number of favorable outcomes and total possible outcomes. That’s it.
• Instant results – No waiting. Hit calculate and see the probability as a fraction, decimal, or percentage.
• Works for basic scenarios – Coin flips, dice rolls, card draws, lottery odds—anything with clear outcomes.
• No ads or sign-ups – It’s just a calculator. Use it and move on with your day.
• Mobile-friendly – Works on your phone, tablet, or desktop. Because who carries a laptop to a poker game?
• Clear explanations – If you’re learning, it shows how the result was calculated so you can understand the math.

FAQ

Can I use this for complex probability problems?
Not really. This tool is for straightforward, single-event probability. If you're dealing with conditional probability, multiple events, or Bayesian stuff, you’ll need something more advanced. But for basic “what are the chances” questions? It’s perfect.

Is my data saved or tracked?
Nope. Nothing is stored. You type in numbers, get a result, and that’s the end of it. No cookies, no tracking, no “improving your experience” nonsense. It’s just math on your screen.