Toolipedia- Free
- No sign-up
- Works on any device
No tool matches your search.
- Free
- No sign-up
- Works on any device
Create a QR code for a link, Wi-Fi, WhatsApp, contact and more, or read one from a photo.
- Free
- No sign-up
- Works on any device
Fill in the details to see your QR code.
PNG for phones, chats and websites. SVG and PDF stay sharp at any size, which is best for printing. Tip: point your phone camera at the preview to test it.
3. Style (optional): colors, dots, logo
Choose a photo or screenshot or drag it here
Works with photos of printed codes, screenshots and image files.
Looking for QR codes…
Probability calculator
Chances of A and B, A or B, neither, and at least once in several tries.
- Free
- No sign-up
- Works on any device
About Probability calculator
Enter the chance of two events to get P(A and B), P(A or B), the chance of neither, and the chance of at least once across several tries. The last one uses 1 - (1 - p) to the power n, which explains why a 10 percent chance repeated 10 times is not 100 percent.
How to use Probability calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
How do I find the chance of at least one success?
Compute the chance of no success in every try, (1 - p) to the power n, and subtract from 1. With p = 0.1 and 10 tries that gives about 65 percent.
Is Probability calculator free?
Yes. Probability calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.