Calculator
Savings growth calculator
Model capital growth with regular monthly contributions and compounding. Data is processed only in your browser, and the page explains the formula and limitations of the result.
Calculator
Enter data
Initial capital, monthly contribution, annual rate and years. Fields marked with an asterisk are required.
How to use the calculator
- Enter the required data: initial capital, monthly contribution, annual rate and years.
- Check the values and select “Calculate”.
- Review the primary result and the detailed calculation components.
Calculation details
Formula and calculation method
Capital compounds monthly, and each contribution made at month end earns returns for the remaining term.
Worked example
Starting with PLN 5,000 and adding PLN 500 monthly for 10 years produces PLN 65,000 of contributions plus a rate-dependent model gain.
Limitations
- A constant rate does not guarantee a result; the model excludes fees, tax, inflation and volatility.
Sources
Engine version: 1.0 · Last reviewed: 3 August 2026
Frequently asked questions
Is the entered data sent to a server?
No. The calculation runs locally in your browser and the values are not saved by default.
Is the result definitive?
Not always. A constant rate does not guarantee a result; the model excludes fees, tax, inflation and volatility.