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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