Compound Interest Calculator
Jenzzy's compound interest calculator shows how principal grows when earnings are reinvested. Adjust rate, compounding frequency, and timeline for savings accounts, CDs, and long-term goals.
Inputs
Results
Enter values to see results.
Formula
A = P(1 + r/n)^(nt)
A is ending balance, P is principal, r is annual rate (decimal), n is compounding periods per year, and t is years.
Example
- Convert rate: r = 5 / 100 = 0.05
- Apply formula: A = 10000 × (1 + 0.05/12)^(12×10)
- Result: A ≈ 16,470.09= $16,470.09
Result: $16,470.09 total after 10 years
Frequently Asked Questions
How often should interest compound?
More frequent compounding yields slightly higher balances at the same nominal rate.
Does this include taxes?
No. Use after-tax rates for taxable accounts.
Can I add monthly contributions?
Use the savings goal calculator for recurring deposits.