Compound Interest Calculator

Calculate compound interest and see how much your savings can grow over time.

Compound Interest Calculator lets you simulate the growth of your capital with recurring contributions (dollar-cost averaging / DCA) in a detailed and accurate way, including with financial leverage.

Set your parameters, tap RUN SIMULATION and get charts, key metrics and a complete year-by-year table showing the effect of compound interest on your investment.

⚙️ CUSTOMIZABLE PARAMETERS
On the Simulation Parameters page you configure every aspect of your investment:
• Initial age and plan duration
• Initial deposit, installment and frequency
• Annual return (monthly compounding)
• Safe Withdrawal Rate (SWR)
• Financial leverage (ratio, mode and cost)
• Second stage with separate parameters

The app calculates contributions, compound interest, debt and interest month by month, creating a realistic and personalized simulation.

📊 COMPLETE RESULTS
• Summary cards: final age, total invested, final capital, profits, total debt (if any), monthly SWR and other key metrics.
• "Capital growth" chart: yearly progression with stacked bars (Equity, Debt, Profit). With a second stage, a vertical band highlights the change of period.
• "Monthly SWR" chart: the sustainable monthly withdrawal calculated from your capital, year by year.
• Year-by-year table: cumulative invested, profit, final value and monthly SWR.

☁️ SAVE TO THE CLOUD
With Google sign-in you can save your simulations and find them again anytime:
• List of saved simulations
• Quick preview of the parameters
• Instant display

📄 PDF EXPORT
Export your simulation to PDF with charts and a full summary.

🌍 MULTILINGUAL
Available in English, Italian, Spanish, French and German.

Also available as a web app: https://primaltoinvestimenti.it/simulatore-pac/