Model compound growth from a starting amount, interest rate, time period, compounding frequency and optional monthly contributions.
| Year | Balance | Contributed | Interest |
|---|---|---|---|
| 1 | 10,616.78 | 10,000 | 616.78 |
| 2 | 11,271.6 | 10,000 | 1,271.6 |
| 3 | 11,966.81 | 10,000 | 1,966.81 |
| 4 | 12,704.89 | 10,000 | 2,704.89 |
| 5 | 13,488.5 | 10,000 | 3,488.5 |
| 6 | 14,320.44 | 10,000 | 4,320.44 |
| 7 | 15,203.7 | 10,000 | 5,203.7 |
| 8 | 16,141.43 | 10,000 | 6,141.43 |
| 9 | 17,136.99 | 10,000 | 7,136.99 |
| 10 | 18,193.97 | 10,000 | 8,193.97 |
Estimate compound growth with annual, quarterly, monthly or daily compounding, optional monthly contributions and a year-by-year breakdown.
For a lump sum with no recurring contribution, compound growth follows A = P(1 + r/n)^(nt), where P is the starting amount, r is the annual nominal rate as a decimal, n is the number of compounding periods per year and t is time in years.
Choosing annual, quarterly, monthly or daily compounding changes n. More frequent compounding produces a slightly higher effective annual return when the nominal annual rate is held constant.
When you add a monthly contribution, Toolmera first converts the selected compounding setup to its equivalent monthly growth rate, then adds each contribution at the end of the month. This keeps the recurring-contribution model consistent across annual, quarterly, monthly and daily compounding choices.
The results separate total contributed money from interest earned so you can see how much of the final value came from your own deposits and how much came from compound growth.
The model assumes a constant stated interest rate for the whole period and regular monthly contributions of the amount you enter. It does not model taxes, account fees, inflation, withdrawals or a changing market return.
Use the result as a scenario model, not a forecast of what a real investment or savings account is guaranteed to produce.
Open the tool and select the mode or options that match your task.
Provide the inputs required for the result.
Check the calculation, assumptions and supporting output shown by Toolmera.
Useful next steps in the same workflow.
Yes. Enter an optional monthly contribution; Toolmera adds it at the end of each modeled month.
You can choose annual, quarterly, monthly or daily compounding.
Yes. The result separates total contributions from interest earned and includes a year-by-year growth table.
No. The result is a nominal growth scenario before inflation, taxes, fees or withdrawals.