How the savings goal formula works
Your current savings grow on their own; the monthly deposits must cover the rest. With r = annual rate ÷ 12 and n = number of months:
Monthly deposit = (Goal − Current × (1 + r)n) × r ÷ ((1 + r)n − 1)
With a 0% rate the formula simplifies to (Goal − Current) ÷ n.
Example: You want $20,000 in 3 years for a down payment and already have $2,000. In an account paying 4.5%, you need to save $460.44 a month. You deposit $18,576 in total (including the starting $2,000) and interest provides the remaining $1,424.
Make your savings plan stick
- Automate it. Schedule a transfer for the day after payday so the money moves before you can spend it.
- Separate accounts. A dedicated account per goal makes progress visible and reduces temptation.
- Use windfalls. Tax refunds, bonuses and gifts can shorten the timeline considerably.
- Review every few months. If rates change or you fall behind, re-run the calculator and adjust.
For long-term goals where growth matters more, see the compound interest calculator or the retirement calculator.
Frequently asked questions
How much should I save each month?
It depends on the goal and deadline. Divide the amount you still need by the number of months, then subtract the help you get from interest. This calculator does both steps precisely, assuming deposits at the end of each month and monthly compounding.
Where should I keep money for a short-term goal?
For goals within about five years, a high-yield savings account, money market account, certificate of deposit or Treasury bills keep your money safe and accessible. Stock market investments can fall right when you need the cash.
How big should an emergency fund be?
A common guideline is three to six months of essential expenses. Households with a single income or variable earnings often aim for six months or more.
What if I can’t afford the monthly amount?
Extend the deadline, lower the goal, or start with a smaller amount and raise it with each pay increase. Automating the transfer on payday makes it much easier to stay consistent.