Savings Goal Calculator

Work backward from the goal

Enter how much you want, how much is already saved, the account’s expected APY and the time available. The calculator finds the equal deposit required at the end of every month.

The result separates what you contribute from interest earned. That makes the assumption visible: if the rate changes or deposits are missed, the result changes too.

How the monthly amount is calculated

The current balance is allowed to grow for the whole term. The remaining target is then funded by a stream of equal month-end deposits.

At zero interest, the answer is simply the remaining amount divided by the number of months. With interest, earlier deposits earn for longer, so the required monthly amount is lower.

The calculated deposit is rounded up to the next cent. Rounding down could leave the projected balance just short of the stated goal.

APY is an effective annual yield

APY describes how much a deposit grows over a full year after compounding. The calculator converts it to an equivalent monthly rate with:

monthly rate = (1 + APY)1/12 − 1

This is not exactly APY divided by 12, because APY already reflects interest earning interest. The conversion ensures that twelve monthly growth periods reproduce the entered annual yield.

Deposit timing matters

The tool assumes each regular deposit arrives at the end of the month. Depositing at the beginning gives each payment one extra month of growth, while irregular or missed deposits reduce the final balance.

For a real plan, automating the transfer shortly after income arrives can make the assumed schedule more reliable. The calculator does not move money or connect to an account.

Variable rates and moving targets

A savings-account APY may be variable. A bank can change it as market rates change, while a promotional rate may expire. Revisit the calculation when the rate changes rather than treating today’s APY as fixed for years.

The target itself may also move. Inflation can raise the cost of a future purchase, and taxes or account fees can reduce growth. The calculator uses nominal currency amounts and does not forecast any of those changes.

When the current balance is enough

If the amount already saved is projected to grow beyond the target within the term, the required monthly deposit is zero. The tool says what that existing balance may become rather than returning a negative deposit.

This is a projection from the entered assumptions, not a guarantee or individualized financial advice.

Frequently asked questions

How much should I save each month?

Enter the target, amount already saved, expected APY and time available. The calculator grows the current balance first, then finds the equal month-end deposit needed to cover the rest.

What is APY?

Annual percentage yield is the effective growth over one year after compounding. It is the comparison rate generally disclosed for deposit accounts.

Why is APY not simply divided by 12?

APY already includes compounding. The equivalent monthly rate is calculated so twelve months reproduce the stated annual yield; simply dividing by 12 does not do that exactly.

When are deposits assumed to happen?

At the end of each month. Depositing earlier earns slightly more interest and could reduce the amount required.

What if I have already saved enough?

If the existing balance is projected to reach the goal by itself, the required monthly deposit is zero. The result shows what that balance may grow to under the entered APY.

Will a savings account keep the same APY?

Not necessarily. Many savings accounts have variable rates that can change at any time. Treat the result as a plan based on the entered rate, not a guarantee.

Does the goal account for inflation or tax?

No. The target and projected balance are nominal amounts. Tax, account fees and changing purchasing power are not modeled.