Compound Interest Calculator
Calculate compound interest with monthly contributions. See your money grow over time!
Future Value
$37,405
After 10 years at 7% annual interest
Total Contributions
$22,000
Total Interest
$15,405
Effective Rate
7.23%
Contributions (59%)Interest (41%)
| Year | Balance | Contributions | Interest |
|---|---|---|---|
| Year 1 | $11,962 | $11,200 | $762 |
| Year 2 | $14,066 | $12,400 | $1,666 |
| Year 3 | $16,322 | $13,600 | $2,722 |
| Year 4 | $18,741 | $14,800 | $3,941 |
| Year 5 | $21,336 | $16,000 | $5,336 |
| Year 6 | $24,117 | $17,200 | $6,917 |
| Year 7 | $27,100 | $18,400 | $8,700 |
| Year 8 | $30,298 | $19,600 | $10,698 |
| Year 9 | $33,728 | $20,800 | $12,928 |
| Year 10 | $37,405 | $22,000 | $15,405 |
Features
- Compound frequency
- Monthly contributions
- Year-by-year breakdown
- Visual chart
- Interest vs principal
- Effective rate
How to Use
- 1Enter starting amount
- 2Set interest rate
- 3Choose time period
- 4Add monthly contributions
Frequently Asked Questions
What is compound interest?
Interest calculated on both the principal and accumulated interest from previous periods.
How often should interest compound?
More frequent compounding (monthly, daily) yields slightly higher returns.
What is a realistic interest rate?
Stock market averages ~7-10% long-term. Savings accounts are typically 0.5-5%.
Are taxes included?
No, this shows gross returns. Actual returns may be lower after taxes.