Savings Goal Calculator
Find exactly how much to save each month to hit any goal by your deadline, or how long your current savings rate will take to get you there.
Turn a Wish Into a Monthly Number
Why a Dated Goal Beats a Vague One
"Save more" is not a goal; "$20,000 by September 2028" is. The difference is that the second version produces a monthly number you can automate, track, and defend when a tempting purchase shows up. Research on savings behavior consistently finds that people with a specific amount and date save more than people with the same income and a general intention.
Three ingredients define any goal: the amount you need, the date you need it, and what you already have. Everything else, including interest, is a detail that nudges the monthly figure up or down by a few percent.
Key Insight: For goals under three years, the monthly amount matters far more than the interest rate. A $20,000 goal over two years needs $750 a month with no interest and $715 a month at 4%. The account choice saves you $35 a month; the discipline of the transfer is worth the whole $20,000.
The Math Behind the Monthly Number
In plain words: take the goal, subtract what you already have (grown by interest until the deadline), and spread what is left across the months remaining, letting interest cover part of it.
Without interest: Monthly = (Goal − Saved) ÷ Months
With interest: Monthly = (Goal − Saved × (1 + i)n) × i ÷ ((1 + i)n − 1), where i is the annual rate divided by 12 and n is the number of months
The second formula is the future-value-of-an-annuity equation turned inside out. The calculator uses it in both directions: give it a deadline and it solves for the payment; give it a payment and it counts forward month by month until the balance crosses the goal.
Pro Strategy: Run the calculator once with your realistic deadline and once with a deadline six months later. If the difference is small, take the earlier date. If the later date brings the monthly figure from painful to comfortable, take the later date and actually stick to it. A goal you abandon in month four is worth nothing.
Where to Keep the Money, by Time Horizon
The right account depends on one question: can this goal survive a bad year in the market? For most dated goals the answer is no.
- Under 1 year: high-yield savings account or Treasury bills. Fully liquid, no risk to principal, and currently paying around 4%.
- 1 to 3 years: high-yield savings, a CD ladder that matures before the deadline, or a short-term Treasury or bond fund. Lock in a rate, but never lock past the date you need the cash.
- 3 to 5 years: mostly cash and short bonds, with at most a quarter in a broad index fund if you could tolerate pushing the goal back a year.
- 5 or more years: a meaningful index-fund allocation starts to make sense, shifting toward cash as the date approaches. This is where the compound interest calculator becomes more useful than this one.
Reality Check: The S&P 500 has fallen 20% or more about once every five years. Anyone who kept an 18-month house down payment in stocks in 2022 watched it shrink by a fifth with the closing date already on the calendar.
The Sinking-Fund Approach for Several Goals
A sinking fund is a savings goal with its own line in the budget: a car replacement fund, a holiday fund, a home-repair fund, an annual-insurance fund. Instead of one lump of "savings" that every goal raids, each goal gets its own monthly number and, ideally, its own sub-account.
Run this calculator once per goal, then add the monthly figures together. If the total is more than you can save, you have found the real conversation: which goal gets delayed, not whether to save at all. Most online banks let you open several named savings buckets under one login at no cost.
Automate on payday. Schedule each transfer for the day after your paycheck lands so the money leaves before it feels like income. People who automate keep their goals on track far more reliably than people who transfer "whatever is left" at month end, which is usually close to nothing.
When the Monthly Number Is Too High
There are only four levers, and the calculator makes each one visible:
- Extend the deadline. Stretching a $20,000 goal from 24 to 36 months cuts the monthly need from about $715 to $465. Use the timeline table to find the deadline that fits.
- Trim the goal. A $22,000 used car instead of a $25,000 one is $125 a month less over two years.
- Add income. A side project earning $300 a month covers 40% of that $715. Temporary income for a temporary goal is a fair trade.
- Earn a higher yield. Moving from a 0.5% bank account to a 4% high-yield account saves about $35 a month on the same goal. Helpful, but the smallest of the four.
Avoid These Costly Mistakes
- ❌ Keeping a goal with a fixed date in the stock market
- ❌ Forgetting that the price of the goal rises with inflation
- ❌ Saving "whatever is left" instead of a fixed automated amount
- ❌ Mixing several goals in one account so none of them is ever fully funded
- ❌ Skipping the emergency fund, then raiding the goal when the car breaks
- ❌ Choosing a deadline so aggressive that the plan collapses in month three
Your Savings Goal Action Plan
- Write down the goal amount, the date, and what you have already set aside
- Run the calculator and read the monthly figure honestly against your budget
- Adjust the deadline or goal until the number is one you will actually keep
- Open a named high-yield savings bucket for this goal alone
- Schedule an automatic transfer for the day after each payday
- Re-run the numbers every six months and after any raise