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Compound Interest Calculator
Calculate compound interest with contributions and see growth over time.
How to Use the Compound Interest Calculator
- Enter your principal investment amount.
- Input the annual interest rate and number of years.
- Add any monthly contribution (optional).
- Select compounding frequency and click Calculate.
Formula & Method
Compound Interest Formula:A = P(1 + r/n)^(nt)
Where A = final amount, P = principal, r = annual rate, n = compounds per year, t = years.
With contributions: each contribution compounds for the remaining periods.
Examples
| Principal | Rate | Years | Final |
|---|---|---|---|
| $10,000 | 7% | 10 | ~$19,672 |
| $5,000 | 5% | 5 | ~$6,381 |
Frequently Asked Questions
What is compound interest?
Interest calculated on the initial principal plus accumulated interest.
How often should interest compound?
Common frequencies are monthly, quarterly, or annually.
Does this include inflation?
No, this calculator shows nominal growth without inflation adjustment.
People Also Ask
How accurate is this calculator?
Our calculators use standard mathematical formulas and provide accurate results.
Can I use this on my phone?
Yes, all tools are fully responsive and work on any device.