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Savings Goal Calculator

Work backwards from a target: how much to save each month, and how much of the goal the interest carries for you.

Buğra SözeriFinance
Updated · Published
Reviewed by Convertitive Finance Desk
Financial disclaimer: This calculator is for educational purposes only and is not financial advice. Returns are not guaranteed; the rate you enter is an assumption, not a promise. Verify all figures with a qualified financial professional before acting on them.

Most savings tools ask what you have and project forward. This one runs the math in reverse: you name the target — a $25,000 down payment, a $10,000 emergency fund, a $60,000 college pot — pick a time horizon and an expected annual return, and it solves for the required monthly contribution. It uses the future value of an ordinary annuity with monthly compounding, the same engine behind our compound interest calculator, just inverted. The result also shows how much of the goal comes from your own contributions versus interest earned, so you can see when time is doing the heavy lifting.

Required monthly contribution
$377.08
Total contributed
$22,624.78
Interest earned
$2,375.22

Assumes monthly compounding with contributions at the end of each month (ordinary annuity). For educational purposes only — not financial advice.

How to use

  1. Enter your target amount

    The total you want to have saved by the end — e.g. 25000 for a $25,000 down payment.

  2. Enter an expected annual return

    As a percent (e.g. 4 for 4%). Be conservative: a high-yield savings account is roughly 4-5%, a diversified stock portfolio is commonly planned at 6-7% nominal. Enter 0 to ignore growth entirely.

  3. Enter your time horizon

    Years until you need the money. The calculator converts this to months and solves for the contribution that lands you exactly on target.

How much per month?

GoalRateYearsMonthly needed
$10,0000%2~$417
$25,0004%5~$377
$60,0006%10~$366
$1,000,0007%30~$820

Frequently asked questions

How does compounding help me reach the goal?
Every contribution starts earning a return immediately, and those returns earn their own returns. The longer your horizon, the more of the goal interest carries. For a $1M goal at 7% over 30 years, you contribute only about $295K of it — the rest is growth. Over a 2-year horizon, growth is negligible and you fund nearly the whole target yourself.
What return rate should I assume?
Be conservative — honestly, lower than you'd like. The rate is an assumption, and overestimating it leaves you short. For cash and short horizons, a high-yield savings account is roughly 4-5%. For a diversified stock portfolio over a long horizon, 6-7% nominal is the common planning figure, but actual returns are volatile and can be negative for years at a stretch. When in doubt, model a lower rate and treat any extra as a bonus.
Should I save monthly or contribute a lump sum?
If you already have the money, a lump sum invested today grows for the full horizon and almost always beats spreading it out — time in the market is the advantage. This calculator solves for steady monthly saving, which is what most people actually do. If you have a lump sum, our compound interest calculator models a starting amount plus contributions.
Does the calculator account for taxes or inflation?
No. The target and the result are in nominal pre-tax dollars. In a taxable account, returns are reduced by tax; across years, inflation erodes purchasing power. If your goal needs to hold its real value, pad the target or subtract about 2-3% from your assumed rate.
What if I set the rate to 0%?
Then the math is simply target ÷ months — no growth assumed. This is the safest, most pessimistic plan and a useful sanity check: it's the maximum you'd ever need to set aside each month if your money earned nothing.
Are my contributions assumed at the start or end of the month?
End of each month — the ordinary annuity convention, and the standard textbook default. Contributing at the start of each month (an annuity due) would reach the goal slightly faster, so treating end-of-month is the conservative choice.

About

The formula

This solves the future value of an ordinary annuity for the payment: PMT = FV · r / ((1+r)ⁿ − 1), where r is the monthly rate (annual ÷ 12) and n is the number of months (years × 12). When the rate is zero it collapses to PMT = FV ÷ n. It's the exact inverse of the future-value formula behind a standard savings projection.

What this isn't

A financial plan. It assumes a single fixed rate, constant monthly contributions, no withdrawals, and no taxes or fees. Real returns are noisy and the assumed rate is the biggest source of error. Use it to set a realistic monthly target, not to guarantee an outcome.

Sources & references

Authoritative references behind the math, constants, and tables on this page. Verified by Buğra Sözeri on the dates shown and re-checked at every deploy.