Financial calculators, simplified.
Free, fast, and accurate tools to help you make smarter financial decisions. Real-time results, interactive charts, no sign-up required.
Including new calculators for 2026's tax law changes, like take-home pay and student loan repayment.
Track your real budget, not just a projection
Log actual income, expenses, and savings over time. No account, no email, no server — your data stays only in this browser.
Featured Calculators
Our most-used tools, or start with any of our 22 free calculators.
Compound Interest Calculator
See how your money grows over time with compound interest and monthly contributions.
Open calculatorMortgage Calculator
Estimate monthly payments, total interest, and a full amortization schedule.
Open calculatorSalary Calculator
Convert your salary between annual, monthly, biweekly, weekly, and hourly rates.
Open calculatorFrom the Blog
Practical guides on debt, budgeting, and building wealth — backed by real math.
How Much House Can You Afford on a $70,000 Salary?
The 28/36 rule lenders actually use, run on a $70k salary — with real numbers on down payments, existing debt, and how much mortgage rates alone move the ceiling.
Rent vs Buy in 2026: The Real Math Nobody Shows You
A full rent vs buy comparison with real numbers: the 5% rule gut check, 10-year equity vs investment returns, and the transaction costs most advice ignores.
The 4% Rule Explained: How to Calculate Your FIRE Number
What the 4% rule really says, how to calculate your FIRE number with the 25x shortcut, and the honest limitations before you bet your retirement on it.
Why Use FinCalc?
Making smart financial decisions starts with understanding the numbers. FinCalc gives you free, accurate financial calculators that update results in real time — no sign-up, no waiting, no "Calculate" button. Just enter your numbers and see instant, interactive charts and detailed breakdowns.
Whether you're planning for retirement, comparing mortgage options, figuring out how much car you can afford, or deciding whether to rent or buy a home, our calculators help you model different scenarios and make data-driven choices. Every tool includes year-by-year projections, clear explanations of the math behind the results, and frequently asked questions to deepen your understanding.
All calculations run entirely in your browser — we never store your financial data. Our tools cover savings and investing, loans and mortgages, currency conversion, inflation, and interest rate comparisons. Each calculator is built with industry-standard formulas and reviewed for accuracy.
Frequently Asked Questions
- Are these financial calculators really free?
- Yes, every calculator on FinCalc is 100% free to use with no limits. There are no premium tiers, no paywalls, and no account required. We believe everyone deserves access to quality financial planning tools.
- How accurate are the results?
- Our calculators use industry-standard financial formulas — the same math used by banks and financial advisors. Results are meant for educational and planning purposes. For major financial decisions, we recommend consulting a qualified financial professional.
- Is my financial data safe?
- Absolutely. All calculations happen locally in your browser. We never send your numbers to a server or store any personal financial information. Your data stays on your device.
- Which calculator should I start with?
- If you're saving or investing, start with the Compound Interest Calculator to see how your money grows over time. If you're buying a home, the Mortgage Calculator breaks down payments, interest, and amortization. For retirement planning, try the Retirement & FIRE Calculator.