Compound Interest Calculator 2026
See how your savings grow over time. Project the future value of an investment with daily, monthly, or yearly compounding - plus optional regular contributions.
Future value after 10 years
$31,998.32
| Total contributed (deposits + contributions) | $22,000.00 |
| Compound interest earned | $9,998.32 |
Why compounding matters
Compound interest earns interest on your interest. At 5% with monthly compounding, $10,000 grows to about $16,470 in 10 years with no extra contributions. Adding $100/month pushes that past $31,500 - the earlier you start, the more the curve bends upward.
Frequently asked questions
A = P(1 + r/n)^(nt), where P is principal, r is the annual rate, n is compounding periods per year, and t is years. This calculator also adds end-of-period contributions.
Yes. More frequent compounding (daily vs yearly) earns slightly more because interest is added to the balance sooner. Over decades the difference compounds noticeably.
No - this one projects savings growth. For loan payments and amortization, use our separate Loan Calculator.