Free Finance Calculators

Loan, mortgage, compound interest, ROI and more. All calculations run locally in your browser.

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Percentage Calculator
Free percentage calculator. Find what is X% of Y, percentage increase/decrease, and more. Step-by-step explanations included.
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Loan Calculator
Free loan calculator for personal loans, auto loans, and student loans. Calculate monthly payments, total interest, and payoff date.
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Mortgage Calculator
Free mortgage calculator with taxes, insurance, PMI, and HOA. Calculate your monthly payment, total interest, and full amortization schedule instantly.
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Compound Interest Calculator
Free compound interest calculator. See how your investments grow over time with regular contributions and compound growth.
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ROI Calculator
Free Return on Investment calculator. Calculate ROI, total profit, and annualized returns for any investment.
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Solar Panel Calculator
Free solar panel calculator. Find the ideal tilt angle for your location, estimate energy production, calculate savings, and determine your solar investment ROI.
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Tip Calculator
Free online tip calculator. Split bills, calculate tips, and per-person amounts instantly. Quick tip percentages and currency support.
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Tax Calculator
Region-based income tax calculator for 6 countries with full breakdown of brackets, deductions, and effective rates.
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Net Wage Calculator
Gross to net salary calculator with social, health, and pension deductions for USA, Czech Republic, UK, Germany, and more.
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Discount Calculator
Calculate sale prices, multi-tier discounts, and savings instantly.

Smart Financial Decisions Start With the Numbers

Every calculator on this page runs entirely in your browser — your salary, loan amounts and investment figures are never uploaded to any server. Choose a tool above to see monthly payments, total interest, investment growth, or the real price after a discount, with full step-by-step breakdowns.

Which calculator should I use?

Frequently Asked Questions

Are these finance calculators free?
Yes — all calculators are completely free, with no registration, no limits and no hidden fees. Non-intrusive advertising keeps them free.
Is my financial data sent to a server?
No. Every calculation runs locally in your browser using JavaScript. The numbers you enter never leave your device.
Which currencies are supported?
The calculators are currency-agnostic — they work with any currency symbol or plain numbers. The tax and net wage calculators additionally support country-specific rules for the Czech Republic, USA, UK, Germany, Poland and Slovakia.
How accurate are the results?
The calculators use standard financial formulas (amortization, compound growth, CAGR). Results are estimates for planning purposes — actual loan terms or tax amounts may differ based on your lender or tax authority.