Help

FinTools provides browser-side finance calculators. Each calculator has a help page covering inputs, methodology, FAQs, and limitations.

Calculator Guides

Compound Interest Calculator Help explains rate and APY inputs, compounding frequencies, contribution timing, and limitations for the Compound Interest Calculator.

Investment Calculator Help covers return assumptions, fee drag, inflation-adjusted results, and scenario behavior for the Investment Calculator.

Retirement Calculator Help explains the projection method, other income, planning age, readiness estimates, and limitations for the Retirement Calculator.

401(k) Calculator Help covers employer match math, 2026 IRS limits, salary growth, and modeling limits for the 401(k) Calculator.

Debt Payoff Calculator Help explains avalanche and snowball ordering, extra payment handling, schedule assumptions, and limitations for the Debt Payoff Calculator.

APY Calculator Help covers both conversion directions, supported compounding frequencies, dollar estimates, and limitations for the APY Calculator.

Savings Goal Calculator Help explains monthly deposit calculations, fixed APY, rounded cents, and examples for the Savings Goal Calculator.

Guides

The guides section covers the concepts behind the calculators: compound interest, APY versus APR, debt payoff strategies, retirement targets, employer matching, and how fees and inflation affect returns.

How The Calculators Run

Implemented calculators run in the browser and do not call APIs, retrieve live financial rates, or connect to financial accounts.

Each calculator offers a scenario link and a downloadable result PNG. Links restore validated inputs and recalculate in the recipient's browser. Anyone with the link can read its values; social previews stay generic. Sharing is explicit, and changing inputs does not update the URL or save them. If a link is malformed or outside the supported sharing bounds, no part of it is loaded.

Privacy And Finance Questions

Use Save as new below any calculator’s results to name a calculation in this browser. Load opens the library filtered to that calculator; All calculators and the site’s Saved calculations link show every record. You can edit names and descriptions or delete records there. After loading, Update selected saved calculation replaces only the selected record’s inputs; Save as new always keeps the old record.

Saved calculations have no account or device sync. Clearing site data removes them, and private browsing may discard them. Storage must be enabled in a current browser on the secure FinTools site. If storage is unavailable, full, or unreadable, FinTools shows an error and does not replace the existing library.

Read the privacy page for current data-handling notes and the terms page for educational-use and no-advice limitations.

Questions And Feedback

For corrections, calculator suggestions, or anything unclear, use the contact page. Do not include sensitive financial information.