About FnCalcs
FnCalcs is a free online financial calculator platform designed to help investors, savers, students, and professionals make smarter financial decisions. Our calculators are fast, accurate, and easy to use. There is no registration required, and every calculator works directly in your browser on desktop and mobile devices. Whether you're planning investments, comparing returns, calculating loan payments, or setting financial goals, FnCalcs provides reliable tools that simplify complex calculations.
Compound Interest Calculator
Estimate how your investments grow over time with compound interest. Calculate future value, total interest earned, and visualize growth using interactive charts.
Best for:
- Long-term investing
- Retirement planning
- SIP calculations
- Wealth accumulation
What this tool does
- Models lump-sum investments and recurring monthly contributions (SIP)
- Supports annual, monthly, and daily compounding
- Visualizes the contribution-vs-interest split with an interactive chart
- Lets you share configurations via URL and export the chart as PNG
What this tool does not do
It does not adjust for taxes, inflation, fees, or variable returns. Real markets fluctuate; this calculator assumes a constant annual rate so you can reason about the underlying mechanics. Nothing here constitutes financial advice — please consult a qualified advisor before making investment decisions.
How the math works
The calculator simulates growth month-by-month. Each month the monthly contribution is added to the running balance, then the balance is compounded at the rate corresponding to your chosen frequency. The closed-form formula A = P(1 + r/n)nt covers the lump-sum case; the simulation generalizes it to handle ongoing contributions correctly.
ROI Calculator
Measure the profitability of an investment by calculating Return on Investment (ROI).
Use it to:
- Compare investment performance
- Evaluate business projects
- Analyze stock or real estate returns
- Understand investment efficiency
CAGR Calculator
Calculate the Compound Annual Growth Rate (CAGR) to measure the average annual return of an investment over multiple years.
Perfect for:
- Stock portfolio analysis
- Mutual fund performance
- Business growth evaluation
- Long-term investment comparison
Loan Calculator
Estimate monthly loan payments, total repayment, and interest costs.
Suitable for:
- Home mortgages
- Personal loans
- Auto loans
- Business financing
Simple Interest Calculator
Quickly calculate simple interest for savings, loans, and educational purposes.
Ideal for:
- Basic finance calculations
- School assignments
- Short-term lending
- Interest comparisons
Savings Goal Calculator
Find out how much you need to save regularly to reach your financial target.
Useful for:
- Emergency funds
- Vacation savings
- Education planning
- Retirement savings
Why Choose FnCalcs?
- Free forever
- Mobile-friendly design
- Instant calculations
- Interactive charts
- No registration required
- Accurate financial formulas
- Fast loading performance
- SEO-friendly financial resources
Our Mission
Our mission is to make financial planning simple and accessible for everyone. We continuously improve our calculators and educational content so users can better understand investing, saving, borrowing, and personal finance.
Privacy
All calculations happen in your browser. No data is sent to a server. Theme preference is stored locally so the app remembers your choice between visits.