Savings Growth Calculator
Project compound returns on your savings with monthly contributions, in years or months.
How the math works
Each month, the tool adds your monthly contribution to the running balance and applies the monthly equivalent of the APY you entered: rm = (1 + APY)1/12 − 1. Results are pre-tax, nominal and assume the rate stays constant for the whole period.
FAQ
Should I enter APY or APR?
The Rate field is treated as APY (annual percentage yield). APY already accounts for compounding, which is what this tool simulates internally on a monthly basis.
Why does interest look small at the start?
Compound interest is back-loaded: most of the growth happens in the final third of the period because the balance — and therefore the monthly interest — is much larger by then.
Does this calculator store my data?
No. Calculations run entirely in your browser. The values you enter never leave your device.