Rates can change
Savings account rates, taxes and inflation change over time. This calculator uses a constant rate to make the mechanics clear.
Example
Starting with 1,000 and adding 250 per month for 10 years at 4% produces a future balance above the total deposits because interest is earned along the way.
How to interpret the result
The estimate separates your saving behavior from the return assumption. If the result is below your goal, the biggest levers are saving more, saving longer or earning a higher return.
Limitations
The calculator does not guarantee a rate, and it does not include taxes, account fees, changing interest rates or inflation-adjusted purchasing power.
Last reviewed: 2026-05-17