What you'll find here
- Basic Calculator — a full calculator with keyboard support, right on the homepage.
- BMI Calculator — body mass index with healthy weight range, metric or imperial.
- Percentage Calculator — three percentage tools side by side.
- Loan Calculator — payments, total interest and a year-by-year balance table.
- Compound Interest — savings growth with monthly contributions.
- Age Calculator — exact age and next-birthday countdown.
- Tip Calculator — tip and bill splitting that updates as you type.
- Unit Converter — length, weight, temperature and volume.
Private by design
Every calculation happens in your own browser. Nothing you type is sent to a server, stored, or shared — close the tab and it's gone. The math uses standard published formulas, noted at the bottom of each calculator page.