About Stackwise

Stackwise offers free money calculators: savings, compound interest, savings goals, APY, 401(k), rent and refinancing. They run in your browser and need no account.

Why it exists

These calculations are simple in principle, but easy to get wrong by hand. Each page shows the formula and a worked example so you can check the result.

Who runs it

Stackwise is built and maintained by Luis Insuasti, a software developer. It is not a financial firm and does not offer financial advice. Formulas are standard and are listed on the methodology page.

What we can and cannot tell you

Results are projections based on what you enter. Real rates, fees and taxes vary. For decisions about your money, talk to a licensed professional.

Contact

Found a mistake? Use the contact page.