Savings Calculator

How it works

Build a regular savings plan

Start with the amount already saved, then enter what you can add each month. Compare a lower deposit or a lower rate to see how your plan changes. At 0% interest, an opening balance of 1,000 plus 100 per month for 12 months gives 2,200. Use the monthly + annual contributions mode when you also plan an extra yearly deposit.

Separating deposits from savings growth

A savings balance contains both money you contributed and modeled interest. Compare those parts to see how much of the ending value comes from your own deposits. Regular contributions and an initial lump sum have different amounts of time to grow. Keep contribution timing consistent across scenarios, and test a lower rate if you want to understand how dependent a target is on growth.

Guides

• Compounding, contributions, and the time between them

  Learn how rates, contribution timing, inflation, and taxes change a savings projection.

Savings growth: formula and assumptions

Each period: balance grows at the equivalent periodic rate, then a contribution is added (or added first for beginning-of-period deposits).

Returns and inflation are assumptions held constant. Annual taxes on positive interest are deducted at year end.

Monthly + annual contributions: formula and assumptions

Ending balance = opening growth + each contribution grown from its event time − modeled interest tax.

The annual stream is additional to twelve monthly contributions. Increases apply separately to each stream. Tax settles at year ends and the final partial year; inflation adjusts purchasing power.

Worked example

Reference example currency: USD. These fixed examples do not change with your calculator preferences.

Using the Savings growth example:

Starting amount ($)

10000

Regular contribution ($)

200

Contribution frequency

Monthly

Nominal annual return (%)

7

Time horizon (years)

10

Compounding per year

Monthly

Contribution timing

End of each period

Tax rate on annual interest (%)

0

Annual inflation assumption (%)

0

Each period: balance grows at the equivalent periodic rate, then a contribution is added (or added first for beginning-of-period deposits).

Example result

These are illustrative inputs. Change the values to explore a different scenario.

What to keep in mind

Projected returns are hypothetical. Actual returns, fees, tax treatment, and deposit terms may differ.

Formula references

• CFPB: understanding mortgages (opens in a new tab)
• Investor.gov: financial tools and calculators (opens in a new tab)

References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.

Common questions