Savings Calculator
A savings calculator helps you estimate how long it will take to reach a goal, given a starting balance, monthly contribution, and optional interest rate. It can also help you figure out how much you need to save each month to hit a target by a specific date.
The math is straightforward, but it is useful to see the timeline in one place. For example, you can compare saving $300 per month versus $500 per month, or see how a modest interest rate changes the result. This gives you a realistic timeline for short- and medium-term goals.
The calculator assumes consistent monthly contributions and a constant annual rate. Real savings behavior can vary, and rates can change. Use the results as a planning guide, then adjust as your situation evolves.
A good approach is to test a conservative scenario (lower rate, lower contributions) and an optimistic scenario. If both timelines are acceptable, you have a more resilient plan.
How it works
The calculator estimates the time to reach a goal using a future value formula. It combines:
- Growth of existing savings
- Growth of regular monthly contributions
The model uses a constant annual rate converted to a monthly rate. It does not include taxes, inflation adjustments, or variable contribution schedules. If the rate is zero, the result is simply goal ÷ monthly contribution.
Examples
Example: Short-term goal - Savings goal: $12,000 - Monthly contribution: $400 - Annual rate: 2.5%
Estimated time to reach the goal is about 2.3 years.
FAQ
Common questions
What if my contributions change?
You can rerun the calculator with a new monthly amount.
Does this include inflation?
No. It assumes the goal amount is fixed in today's dollars.
Is interest guaranteed?
No. Rates can change, especially for variable-rate accounts.
Disclaimer
Disclaimer
Results are approximate and for planning only.
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