About FormulaDeck

FormulaDeck is a free library of online calculators for finance, math, health, unit conversion, and everyday decisions. Every calculator runs right in your browser: type in your numbers and the answer appears instantly, with no account, no sign-up, and no personal information required. The library covers 62 calculators, from mortgage payments and compound interest to BMI and percentages, all built around standard published formulas. Results are estimates for planning purposes — they are not professional financial, medical, or legal advice. FormulaDeck is a small independent project; the goal is simple: the fastest path from "I need to calculate this" to an answer you can trust.

Privacy

FormulaDeck does not require an account and does not ask for personal information. Calculator inputs are processed on the page in your browser.