To reach a savings target you need to know one number: how much to put away each month. That depends on the goal, what you already have, how long you have and the interest your account pays. To turn $2,000 into $20,000 in 3 years at 4% APY you need to save about $465.38 a month; interest covers roughly $1,246 of the gap.
This is the same future-value math used by Investor.gov's savings goal calculator, run backwards. Use it for an emergency fund, a house down payment, a car, tuition or a trip.
How to use the savings goal calculator
- Enter the amount you want to have.
- Enter what you have already saved toward it.
- Enter the time you have, in years or months.
- Enter the APY your savings account or CD pays. Use 0 to see the no-interest figure.
Formula
Deposits are assumed at the end of each month. APY already includes compounding, so it is converted to an equivalent monthly rate.
Worked example
Goal $20,000, $2,000 saved, 3 years, 4% APY.
- i = 1.041/12 − 1 = 0.0032737; n = 36.
- $2,000 grows to 2,000 × 1.043 = $2,249.73.
- Gap: $20,000 − $2,249.73 = $17,750.27.
- Monthly deposit = 17,750.27 × 0.0032737 ÷ (1.003273736 − 1) = $465.38.
- Total deposits: $465.38 × 36 = $16,753.84, so interest supplies about $1,246.
With no interest you would need ($20,000 − $2,000) ÷ 36 = $500 a month.
Making the goal realistic
If the monthly figure is too high, extend the time frame or lower the goal; the interest rate makes a modest difference over short periods. For goals more than a few years away, prices may rise. Raise the target by expected inflation with the inflation calculator. To see how a fixed monthly amount grows instead, use the compound interest calculator. To see what share of your pay the deposit represents, convert your pay with the hourly to salary calculator.
How the deadline changes the monthly amount
Monthly deposits needed to reach $10,000 from zero, at a 4% APY (compounded and deposited monthly):
| Time | With 4% APY | With no interest |
|---|---|---|
| 1 year | $818.43 | $833.33 |
| 2 years | $401.19 | $416.67 |
| 3 years | $262.18 | $277.78 |
| 5 years | $151.11 | $166.67 |
Over short horizons the interest helps only a little; the time you allow matters far more. Over long horizons, compounding does more of the work, as the compound interest calculator shows.
Caveats and assumptions
- The APY is assumed constant; savings rates change.
- Taxes on interest are ignored.
- Deposits at the start of each month would need slightly less.
- The 4% default is a planning figure, not a quoted rate.
Frequently asked questions
How much do I need to save each month to get $20,000 in 3 years?
Starting from $2,000 at 4% APY, about $465 a month. Starting from zero with no interest, $555.56 a month.
How do I calculate a monthly savings target?
Subtract what your current savings will grow to from the goal, then divide by the future value of $1 a month: gap × i ÷ ((1 + i)^n − 1).
Does interest make a big difference?
Over 1–3 years it trims the monthly amount modestly. Over a decade or more it makes a large difference.
What is APY?
Annual percentage yield: the effective yearly return including compounding. Banks quote savings rates as APY.
How much should I save each month for $10,000 in 2 years?
About $401 a month at a 4% APY, or $417 a month with no interest.
Should I count money I already have?
Yes. Enter it under "Already saved"; it earns interest too, which lowers the monthly amount you need.
What if I can only save a fixed amount each month?
Try different time frames until the monthly figure matches what you can save, and that tells you roughly when you will reach the goal.
Sources
- Investor.gov (SEC) — Savings Goal Calculator — official savings goal tool
- Investor.gov (SEC) — Compound Interest Calculator — future value with monthly deposits
- Investor.gov — Glossary — APY and related terms
This calculator gives estimates for planning and education only. It is not financial, tax or investment advice. Your lender, card issuer, employer or tax authority uses its own terms, fees and rounding, so confirm figures with them before deciding. See our disclaimer and how we build and check calculators.