We build free, accurate financial calculators and write plain-English guides so that anyone — regardless of their financial background — can make smarter, more confident money decisions.
Personal finance is full of jargon, conflicting advice, and tools designed to sell you something. We built Financulator to be the opposite: a genuinely useful resource with no paywalls, no product recommendations driven by hidden commissions, and no financial advice disguised as education.
Every calculator on this site computes results using the same standard financial formulas used by banks, financial planners, and the federal government. Our editorial guides are written to answer the questions people actually ask — in language that doesn't require a finance degree to understand.
Our goal is simple: if you leave Financulator with a clearer picture of your mortgage, your debt payoff timeline, or how much you need to retire — we've done our job.
Every calculator uses industry-standard formulas. We show you the math, and our results match what you'd get from a certified financial planner's spreadsheet — not a simplified approximation.
All calculations run entirely in your browser. We never see, store, or transmit the numbers you enter. Your financial data is yours alone.
Financial literacy shouldn't require a translator. We define every term, explain every formula, and write every guide so that a first-time budgeter and a seasoned investor can both benefit.
Financulator is and will remain free. We're supported by display advertising, not by selling your data or steering you toward specific financial products. Our guides are never pay-to-read.
Tax limits, interest rate benchmarks, and regulatory rules change. We review and update our content regularly to keep information accurate and current.
We're a tool, not a financial advisor. Our calculators and guides provide information to inform your decisions — not to replace the judgment of a licensed professional for your specific situation.
Financulator currently offers nine free financial calculators covering the most common money decisions people face:
Each calculator includes an amortization table or interactive chart where applicable, detailed explanations of each input and output, and links to related guides so you can understand the math behind the numbers.
In addition to the calculators, we publish long-form personal finance guides covering the concepts behind the tools. These guides are written for readers who want to understand why the numbers work the way they do — not just what to plug into a calculator.
Every formula we use is standard financial mathematics. Our mortgage calculator uses the fixed-payment amortization formula used by every lender in the United States. Our compound interest calculator uses the standard periodic compounding formula from financial mathematics. Our retirement calculator applies the widely-cited "4% rule" from the original Trinity Study research.
We cite our methodology in each calculator's educational section. Where there is genuine expert debate — such as whether 3.5% or 4% is the more appropriate safe withdrawal rate in today's environment — we present the range of opinion rather than presenting one figure as settled fact.
A note on estimates: Financial projections involve assumptions about future conditions — investment returns, inflation rates, and interest rates — that cannot be known in advance. Our calculators use commonly assumed default values, but we strongly encourage running scenarios with different inputs to understand the range of possible outcomes rather than treating any single projection as certain.
Financulator is supported by display advertising. We work with Google AdSense and may display ads from a variety of advertisers. We do not accept sponsored content, paid reviews, or advertiser influence over our editorial decisions.
Some of our calculator pages and guides contain links to third-party financial products. When these links include affiliate tracking, we disclose this clearly. Our editorial recommendations are never influenced by affiliate commission rates — we link to products we believe are genuinely useful, and we disclose our affiliate relationships as required by the FTC and applicable law.
Have a question about a calculation, a factual correction, or a suggestion for a new calculator or guide? We'd genuinely like to hear from you. Reach us at our contact page.
If you're a financial professional who has spotted an error in our methodology, please let us know — accuracy is our highest editorial priority and we take corrections seriously.