Compound Interest Calculator
Calculate how your investments grow over time with compound interest
Investment Summary
Final Balance
$54,713.58
Total Contributions
$34,000.00
Total Interest Earned
$20,713.58
Effective Annual Rate
7.23%
APY with compounding
Input Parameters
Initial Investment
$10,000.00
Monthly Contribution
$200.00
Annual Interest Rate
7%
Time Period
10 years
Year-by-Year Breakdown
| Year | Start Balance | Contributions | Interest | End Balance |
|---|---|---|---|---|
| 1 | $10,000.00 | $2,400.00 | $801.42 | $13,201.42 |
| 2 | $13,201.42 | $2,400.00 | $1,032.85 | $16,634.27 |
| 3 | $16,634.27 | $2,400.00 | $1,281.01 | $20,315.28 |
| 4 | $20,315.28 | $2,400.00 | $1,547.11 | $24,262.39 |
| 5 | $24,262.39 | $2,400.00 | $1,832.45 | $28,494.83 |
| 6 | $28,494.83 | $2,400.00 | $2,138.41 | $33,033.24 |
| 7 | $33,033.24 | $2,400.00 | $2,466.49 | $37,899.74 |
| 8 | $37,899.74 | $2,400.00 | $2,818.29 | $43,118.03 |
| 9 | $43,118.03 | $2,400.00 | $3,195.52 | $48,713.55 |
| 10 | $48,713.55 | $2,400.00 | $3,600.02 | $54,713.58 |
$
Starting amount
$
Additional monthly investment
%
Expected annual return
years
Investment duration
How often interest compounds
Final Balance
$54,713.58
Total Contributions
$34,000.00
Total Interest Earned
$20,713.58
Effective Annual Rate
7.23%
APY with compounding
Growth Over Time
| Year | Balance | Contributions |
|---|---|---|
| Year 1 | $13,201.42 | $12,400.00 |
| Year 2 | $16,634.27 | $14,800.00 |
| Year 3 | $20,315.28 | $17,200.00 |
| Year 4 | $24,262.39 | $19,600.00 |
| Year 5 | $28,494.83 | $22,000.00 |
| Year 6 | $33,033.24 | $24,400.00 |
| Year 7 | $37,899.74 | $26,800.00 |
| Year 8 | $43,118.03 | $29,200.00 |
| Year 9 | $48,713.55 | $31,600.00 |
| Year 10 | $54,713.58 | $34,000.00 |
Loading chart...
Year-by-Year Breakdown
| Year | Start Balance | Contributions | Interest | End Balance |
|---|---|---|---|---|
| 1 | $10,000.00 | $2,400.00 | $801.42 | $13,201.42 |
| 2 | $13,201.42 | $2,400.00 | $1,032.85 | $16,634.27 |
| 3 | $16,634.27 | $2,400.00 | $1,281.01 | $20,315.28 |
| 4 | $20,315.28 | $2,400.00 | $1,547.11 | $24,262.39 |
| 5 | $24,262.39 | $2,400.00 | $1,832.45 | $28,494.83 |
| 6 | $28,494.83 | $2,400.00 | $2,138.41 | $33,033.24 |
| 7 | $33,033.24 | $2,400.00 | $2,466.49 | $37,899.74 |
| 8 | $37,899.74 | $2,400.00 | $2,818.29 | $43,118.03 |
| 9 | $43,118.03 | $2,400.00 | $3,195.52 | $48,713.55 |
| 10 | $48,713.55 | $2,400.00 | $3,600.02 | $54,713.58 |
Calculator Assumptions
- Interest rate: Assumed constant over entire period; actual returns vary year-to-year
- Contributions: Monthly contributions made at month-end and earn interest from the following period
- Compounding: Interest compounds at selected frequency (more frequent = slightly higher returns)
- Taxes: Not deducted; actual returns depend on account type (tax-deferred, taxable, or tax-free)
- Fees: Not deducted; investment fees reduce actual returns by 0.1-1%+ annually
- Inflation: Not accounted for; real purchasing power will be lower than nominal balance
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