Compound Interest Calculator
Compound interest earns interest on past interest. Small monthly additions over many years make a large difference.
Results
How it works
Future value = P(1 + r)^n + PMT((1 + r)^n - 1) / r, with r = rate / 12 and n months. Contributions are added at month end.
FAQ
Is the rate guaranteed?
No. Savings rates change and investments go up and down. Use a cautious rate.
Are taxes or inflation included?
No. Results are in today's nominal dollars before tax.
Monthly or yearly compounding?
Monthly, which matches most savings accounts.
Related calculators
Estimates, not tax or financial advice. Check important numbers with a qualified professional.