Savings Goal Calculator
How long to reach a savings target with regular contributions. e.g. “How long to save $20,000 at $400 a month?”
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Results update as you type. All calculation happens in your browser.
Methodology
How long to reach a savings target with regular contributions. This tool uses a standard, documented formula and runs entirely on your device.
Last reviewed January 2026 · Runs client-side
Reaching a savings goal on schedule
A savings goal is really a question of three forces working together: what you start with, what you add each month, and the return your money earns along the way. This calculator runs them forward month by month until the balance meets your target, so you see a realistic timeline rather than a rough guess.
Because contributions and growth compound together, the finish line often arrives sooner than a simple division would suggest, and adjusting the monthly amount even slightly can move it by months.
How to use this calculator
- Enter your goal and how much you have saved so far.
- Add the amount you plan to contribute each month.
- Set an expected annual return, then read the time to reach your goal and the interest earned.
What the inputs mean
- Monthly contribution
- The amount you add every month. This is usually the fastest lever for reaching a goal sooner.
- Annual return
- An estimated yearly rate. Real returns vary, so treat the timeline as a plan rather than a promise.
Starting with $2,000 and adding $400 a month at a 4% return, a $20,000 goal is reached in roughly three and a half years, with a few hundred dollars of that coming from interest.
The formula, in plain terms
Each month the balance grows by one-twelfth of the annual rate, then the contribution is added, repeating until the balance reaches the goal.
Frequently asked questions
Is the return guaranteed?
No. It is an assumption you enter, and real returns fluctuate. Use a conservative figure for a safer estimate.
How can I reach my goal faster?
Raising the monthly contribution usually helps most, since it adds to the balance directly every month regardless of the rate.
Last reviewed January 2026. This explainer is general information, not professional advice.