Compound Interest Calculator
See how your money grows over time with compound interest and regular contributions.
Investment Details
$
$
%
yrs
Formula
A = P(1 + r/n)^(nt) + PMT×[(1+r/n)^(nt)−1]/(r/n)
- A = Final amount
- P = Principal
- r = Annual rate (decimal)
- n = Compounding periods/year
- t = Time in years
- PMT = Periodic contribution
Final Balance
$144,572.72
Total Contributed
$58,000.00
Total Interest
$86,572.72
Interest Share
59.9%
Growth Over Time
- Total Balance
- Amount Contributed
Year-by-Year Breakdown
| Year | Balance | Contributed | Interest Earned |
|---|---|---|---|
| Yr 1 | $13,201.42 | $12,400.00 | $801.42 |
| Yr 2 | $16,634.27 | $14,800.00 | $1,834.27 |
| Yr 3 | $20,315.28 | $17,200.00 | $3,115.28 |
| Yr 4 | $24,262.39 | $19,600.00 | $4,662.39 |
| Yr 5 | $28,494.83 | $22,000.00 | $6,494.83 |
| Yr 6 | $33,033.24 | $24,400.00 | $8,633.24 |
| Yr 7 | $37,899.74 | $26,800.00 | $11,099.74 |
| Yr 8 | $43,118.03 | $29,200.00 | $13,918.03 |
| Yr 9 | $48,713.55 | $31,600.00 | $17,113.55 |
| Yr 10 | $54,713.58 | $34,000.00 | $20,713.58 |
| Yr 11 | $61,147.34 | $36,400.00 | $24,747.34 |
| Yr 12 | $68,046.20 | $38,800.00 | $29,246.20 |
| Yr 13 | $75,443.79 | $41,200.00 | $34,243.79 |
| Yr 14 | $83,376.14 | $43,600.00 | $39,776.14 |
| Yr 15 | $91,881.93 | $46,000.00 | $45,881.93 |
| Yr 16 | $101,002.60 | $48,400.00 | $52,602.60 |
| Yr 17 | $110,782.60 | $50,800.00 | $59,982.60 |
| Yr 18 | $121,269.60 | $53,200.00 | $68,069.60 |
| Yr 19 | $132,514.70 | $55,600.00 | $76,914.70 |
| Yr 20 | $144,572.72 | $58,000.00 | $86,572.72 |
Compound Interest Calculator
Generated June 10, 2026Final Balance
$144,572.72
Total Contributed
$58,000.00
Total Interest
$86,572.72
Interest Share
59.9%
Inputs
Initial Investment$10,000.00
Monthly Contribution$200.00
Annual Interest Rate7%
Investment Period20 years
Year-by-Year Breakdown
| Year | Balance | Contributed | Interest Earned |
|---|---|---|---|
| Yr 1 | $13,201.42 | $12,400.00 | $801.42 |
| Yr 2 | $16,634.27 | $14,800.00 | $1,834.27 |
| Yr 3 | $20,315.28 | $17,200.00 | $3,115.28 |
| Yr 4 | $24,262.39 | $19,600.00 | $4,662.39 |
| Yr 5 | $28,494.83 | $22,000.00 | $6,494.83 |
| Yr 6 | $33,033.24 | $24,400.00 | $8,633.24 |
| Yr 7 | $37,899.74 | $26,800.00 | $11,099.74 |
| Yr 8 | $43,118.03 | $29,200.00 | $13,918.03 |
| Yr 9 | $48,713.55 | $31,600.00 | $17,113.55 |
| Yr 10 | $54,713.58 | $34,000.00 | $20,713.58 |
| Yr 11 | $61,147.34 | $36,400.00 | $24,747.34 |
| Yr 12 | $68,046.20 | $38,800.00 | $29,246.20 |
| Yr 13 | $75,443.79 | $41,200.00 | $34,243.79 |
| Yr 14 | $83,376.14 | $43,600.00 | $39,776.14 |
| Yr 15 | $91,881.93 | $46,000.00 | $45,881.93 |
| Yr 16 | $101,002.60 | $48,400.00 | $52,602.60 |
| Yr 17 | $110,782.60 | $50,800.00 | $59,982.60 |
| Yr 18 | $121,269.60 | $53,200.00 | $68,069.60 |
| Yr 19 | $132,514.70 | $55,600.00 | $76,914.70 |
| Yr 20 | $144,572.72 | $58,000.00 | $86,572.72 |
The Power of Compound Interest
Compounding Frequency
More frequent compounding means slightly higher returns. Monthly compounding on a savings account will outperform annual compounding at the same stated rate.
Time Is the Most Powerful Variable
Starting 10 years earlier can double your final balance, even with lower contributions. This is the core principle behind retirement planning.
Real vs. Nominal Returns
These figures are nominal (before inflation). For real purchasing power, subtract the inflation rate (~3%) from the growth rate to get your actual gain.