Have a suggestion for a new calculator? Found a bug? Want to report an error in our math? We'd love to hear from you. We're committed to making this the best free probability resource on the web.
For website issues, calculator ideas, feedback, or anything else, email us directly:
We typically respond within 2-3 business days. For urgent bug reports related to calculation errors, please include the specific calculator name and the inputs you used so we can reproduce the issue.
Common Topics
- New calculator suggestions (e.g., expected value, normal distribution, z-score)
- Corrections to existing calculations or explanations
- Feature requests (export, print, additional chart types)
- Partnership or educational licensing inquiries