Compound Interest Calculator
Estimate how your savings or investments could grow with compounding and recurring monthly contributions.
How this estimate works
This calculator combines your starting deposit, recurring monthly contributions, and expected annual return to estimate how your balance could grow over time.
Compounding frequency changes how often returns are added back into your balance. More frequent compounding usually leads to slightly higher long-term growth.
This is an estimate for planning purposes. Real investment returns vary and are never guaranteed.
| Year | Contributions | Interest | Ending Balance |
|---|---|---|---|
| 1 | $15,500.00 | $919.19 | $16,419.19 |
| 2 | $6,000.00 | $1,419.38 | $23,838.57 |
| 3 | $6,000.00 | $1,955.73 | $31,794.30 |
| 4 | $6,000.00 | $2,530.86 | $40,325.16 |
| 5 | $6,000.00 | $3,147.55 | $49,472.71 |
| 6 | $6,000.00 | $3,808.82 | $59,281.53 |
| 7 | $6,000.00 | $4,517.91 | $69,799.44 |
| 8 | $6,000.00 | $5,278.25 | $81,077.69 |
| 9 | $6,000.00 | $6,093.55 | $93,171.24 |
| 10 | $6,000.00 | $6,967.79 | $106,139.03 |
| 11 | $6,000.00 | $7,905.24 | $120,044.27 |
| 12 | $6,000.00 | $8,910.43 | $134,954.70 |
| 13 | $6,000.00 | $9,988.31 | $150,943.01 |
| 14 | $6,000.00 | $11,144.12 | $168,087.13 |
| 15 | $6,000.00 | $12,383.48 | $186,470.61 |
| 16 | $6,000.00 | $13,712.40 | $206,183.01 |
| 17 | $6,000.00 | $15,137.43 | $227,320.44 |
| 18 | $6,000.00 | $16,665.44 | $249,985.88 |
| 19 | $6,000.00 | $18,303.93 | $274,289.81 |
| 20 | $6,000.00 | $20,060.89 | $300,350.70 |
A compound interest calculator estimates how money can grow over time when returns are added back into your balance. It helps you model an initial deposit, recurring contributions, and an expected annual return.
Contributions are the dollars you personally add, such as your starting balance and monthly savings. Interest earned is the estimated growth generated by compounding on top of those contributions.
Many savings and investment examples use monthly compounding, but some accounts may compound daily, quarterly, or annually. This calculator lets you compare those scenarios to see how frequency changes the estimate.
No. This tool is for planning and education only. Actual investment returns can rise or fall and may differ significantly from any fixed-rate projection.
Yes. Your inputs stay in your browser for calculation purposes. If site analytics are enabled, they only measure anonymous product usage and never include the numbers you enter.