About oddcalcs

oddcalcs is a collection of small, single-purpose calculators built by one person for questions that don't deserve a spreadsheet but do deserve a correct answer. Every tool runs entirely in your browser, shows the formula it used, and cites where the formula came from.

Principles

No accounts, no app, no "unlock the full result" upsell. If a tool's method is debatable, it shows more than one method instead of pretending there is a single right answer. Pages are kept light so they load fast on a phone.

Suggest a calculator

If there is a calculation you keep doing by hand, or a tool elsewhere that is wrong or annoying, email [email protected]. Short requests are fine.

Accuracy

These are estimates for curiosity and planning, not professional advice. Where a tool touches health, money, or safety, check the result with someone qualified before acting on it.