Financial answers in seconds
Free calculators for loans, savings, retirement and debt — with plain-English explanations of the math behind every result. No sign-up. Nothing tracked. Everything runs in your browser.
All calculators
Savings & Investing
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Compound Interest Calculator
Project how savings grow with monthly deposits and compounding.
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Savings Goal Calculator
Find the exact monthly saving needed to hit a target amount.
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Retirement Savings Calculator
Project your nest egg and the income it could support.
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Investment Return (CAGR) Calculator
Turn a total gain into an honest annualized return.
Loans & Debt
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Loan Payment Calculator
Monthly payment, total interest and cost of any amortized loan.
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Mortgage Calculator
Full monthly housing cost: loan, property tax and insurance.
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Loan Payoff Calculator
See how extra monthly payments shorten a loan and cut interest.
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Debt Avalanche vs Snowball Calculator
Compare the two classic payoff strategies on your own debts.
Income & Budgeting
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Salary to Hourly Calculator
Convert annual salary to hourly, weekly and monthly pay.
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Take-Home Pay Estimator
Estimate net monthly pay from gross salary and tax rates.
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50/30/20 Budget Calculator
Split your take-home pay into needs, wants and savings.
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Emergency Fund Calculator
Size your emergency fund and see how long it takes to build.
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Inflation Calculator
See what today's money will be worth in the future.
Business
Guides & explainers
"The 50/30/20 Rule in Real Life: Where It Works, Where It Breaks, How to Fix It"
An honest field guide to the most famous budgeting rule — including what to do when rent alone eats 45% of your income.
How Compound Interest Builds Wealth (and Why Starting Late Costs So Much)
A plain-English walkthrough of compound growth, with real numbers showing why time in the market beats timing — and what starting five years late actually costs.
"Emergency Fund vs Investing: Which Dollar Goes Where First?"
A decision framework for the classic dilemma — cash safety versus market growth — including the order of operations most planners actually recommend.
"How Much House Can You Afford? The 28/36 Rule and Its Honest Limits"
A practical framework for setting your housing budget — the 28/36 rule, the costs first-time buyers forget, and when the guidelines mislead.
"Marginal vs Effective Tax Rate: The Misunderstanding That Costs People Real Money"
Why "being in the 24% bracket" doesn't mean losing 24% of your income, how progressive brackets actually work, and the raise myth debunked with numbers.
"How to Pay Off Debt Faster: A Strategy Guide That Respects Both Math and Psychology"
Avalanche, snowball, consolidation and balance transfers compared honestly — which debt payoff strategy fits your numbers and your temperament.
Why FinCalc Lab?
Private by design
Every calculation happens in your browser. Your salary, debts and savings never leave your device.
The math, explained
Each tool shows the formula it uses and walks through what the result actually means for you.
No paywalls, ever
Free to use, no accounts, no "premium" upsell. Supported by unobtrusive advertising.