📌 Overview

See how your savings grow with compound interest. Enter principal, rate, years, compounding frequency and optional monthly contributions.

📈 Compound Interest Calculator

See how your savings grow with compound interest. Enter principal, rate, years, compounding frequency and optional monthly contributions.

Principal

Annual Rate (%)

Years

Compounding

Monthly Contribution — optional

Enter values to project your balance.

🔒 All processing happens in your browser. No data is uploaded to any server.

📋 How to Use

Enter your starting principal.
Set the annual rate and number of years.
Choose the compounding frequency.
Optionally add a monthly contribution to see the effect.

❓ FAQ

What is compound interest?

Compound interest is interest earned on both your original principal and previously accumulated interest, so growth accelerates over time.

How does compounding frequency matter?

More frequent compounding (e.g. monthly vs annually) produces slightly higher returns for the same rate.

Are contributions added before or after interest?

This calculator adds each monthly contribution and compounds the balance, giving a close estimate of end value.

💡 Use Cases

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Savings Goals

See how long it takes to reach a target amount.

📊

Investing

Model long-term growth of index funds or deposits.

🎓

Education Funds

Plan contributions for future tuition costs.

🔗 Related Tools

📖 Deep Dive: Compound Interest Calculator

See how your savings grow with compound interest. Enter principal, rate, years, compounding frequency and optional monthly contributions.

Compound Interest Calculator is a free tool that runs 100% in your browser. No signup, no uploads — your data stays private. Perfect for everyday text and data tasks, saving you time and reducing mistakes.