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.

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 store inputs, call APIs, retrieve live financial rates, or connect to financial accounts.

Privacy And Finance Questions

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.