How to use this calculator
Explore how a balance could grow with monthly deposits and a constant hypothetical return. The model uses monthly compounding and assumes contributions arrive at the end of each month.
What this calculator models
Interest is added monthly at the entered nominal annual rate divided by twelve. Contributions are added after each month’s growth; these assumptions matter when comparing calculators.
Try multiple scenarios
Run a low, middle and high return assumption. For investing, a smooth positive return is not realistic every year, and past performance does not guarantee future results.
Do not forget purchasing power
Taxes, account fees and inflation are excluded. Those factors can materially reduce the value of a future amount.
Transparency note
This tool is a simplified educational model. It does not fetch live financial-product rates, consider your personal circumstances or guarantee outcomes. Check official statements and terms before acting.
Frequently asked questions
Are results guaranteed?
No. The interest rate is a hypothetical fixed assumption, not a forecast.
Are contributions made at the start of the month?
No. Contributions are assumed at the end of each month.