Tool
Compound Interest Calculator
Project compound interest growth over time.
Finance / Percentage Calculators
What this tool does
Estimate future value and interest earned with compound growth assumptions.
How to use
- Enter principal, annual rate, years, and compounding periods per year.
- View future value and total interest.
Formula
A = P(1 + r/n)^(nt)
Examples
$10,000 at 5% for 10 years, compounded monthly
Input: P=10000, r=5, t=10, n=12
Output: ≈ $16,470 future value
Monthly compounding grows faster than annual.
Assumptions
- Fixed rate for entire period.
- No withdrawals or additional deposits.
- Estimate only—not financial advice.
Common use cases
- Estimate savings growth
- Compare compound vs simple interest
- Plan long-term investment scenarios
FAQ
Is this investment advice?
No. This is an estimate using fixed inputs.
What compounding frequency should I use?
12 for monthly, 4 for quarterly, 1 for annual.
Does it account for contributions?
No. Only initial principal compounds in this version.
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Last reviewed: 2026-05-23