Toolram

Compound interest calculator

Project investment growth with compound interest, monthly contributions, multiple currencies.

About Compound interest calculator

Calculate compound interest projections with initial amount, monthly contributions, annual return rate and time horizon. Supports compounding frequencies (annual, monthly, daily) and 8+ currencies.

Why use Toolram

  • 🔒 100% private
    Your data never leaves your browser.
  • ⚡ No waiting
    Instant results, no uploads.
  • 📱 Works on mobile
    Optimized responsive design.
  • 🎁 Forever free
    No signup, no watermark.

Frequently asked questions

What is the difference from simple interest?

Simple interest always pays on the original amount. Compound interest pays on the amount plus the interest already earned, which is why it accelerates.

Does the compounding frequency matter?

Yes. Monthly compounding beats annual at the same rate, though the gap is smaller than most people expect.

Can I add regular contributions?

Yes, and that is usually where the real growth comes from — more than the rate itself over long periods.

🇲🇽 También disponible en español