SuperCalc

SuperCalc. SuperCalc provides free, privacy-first calculators for finance, tax, mortgage, retirement, health, and business decisions.

SuperCalc: Early access, open to join. Get it at supercalc.dev.

SuperCalc is a browser-based calculator platform with more than 500 task-specific tools for people planning finances, taxes, health and business decisions. Calculators are grouped into 16 categories including finance, tax, real estate, loans, health, investment, insurance and math, plus curated collections such as a Homebuyer Toolkit, Tax Season 2026 and a Retirement Suite. Each calculator shows its method, assumptions, sources, update date and limitations where available, and the arithmetic generally runs in the browser. It is free to use with no account or installation required.