Transparent method
The formula
Worked example
Example inputs
How to interpret the result
The monthly deposit needed to reach a future balance shrinks meaningfully once a realistic rate of return gets factored in, because growth on existing contributions does part of the work. Treating the goal as pure principal to save, with no return assumed, overstates the monthly deposit actually required.
Before you rely on it
What to check
Confirm the assumed rate of return is realistic for where the savings will actually sit, since a rate that's too optimistic or too conservative both distort the calculated monthly deposit in opposite directions.
The common error
Where people go wrong with savings goal calculator
Dividing the future goal by the number of months with no growth assumption at all, treating the target as if the money would earn nothing along the way. That approach overstates the required monthly deposit whenever the savings actually earn any return.
Sensitivity evidence
How expected annual return changes the required monthly saving
| Expected annual return | Required monthly saving | Future contributions |
|---|---|---|
| 4.0% | $1,285 | $385,572 |
| 5.0% | $948 | $284,549 |
| 6.0%worked example | $638 | $191,291 |
| 7.0% | $351 | $105,295 |
| 8.0% | $87 | $26,018 |
Every input, tested
Which input moves the required monthly saving most
| Input | Tested from | To | Required monthly saving at each end | Swing |
|---|---|---|---|---|
| Years to goal | 19.0 years | 31.0 years | $1,441 to $186 | $1,255 (197%) |
| Expected annual return | 5.0% | 7.0% | $948 to $351 | $598 (94%) |
| Future savings goal | $900,000 | $1,100,000 | $493 to $782 | $289 (45%) |
| Current savings | $112,500 | $137,500 | $718 to $557 | $161 (25%) |
Two variables at once
Required monthly saving by expected annual return and future savings goal
| Expected annual return \ Future savings goal | $800,000 | $1,000,000 | $1,200,000 |
|---|---|---|---|
| 4.0% | $896 | $1,285 | $1,674 |
| 5.0% | $613 | $948 | $1,284 |
| 6.0% | $349 | $638 | $926 |
| 7.0% | $104 | $351 | $598 |
| 8.0% | $0.00 | $87 | $297 |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Future savings goal | $1,000,000 |
| Current savings | $125,000 |
| Expected annual return | 6.0% |
| Years to goal | 25.0 years |
| Required monthly saving | $638 |
| Future contributions | $191,291 |
Where the inputs come from
Future savings goal is the amount you need at the target date, in the dollars of that date, so inflate a goal that is costed in today's prices. Current savings is what you already have earmarked for it. Expected annual return should match where the money will sit: a savings rate for near goals and a lower-than-average market return for long ones. Years to goal is the deadline. Split multiple goals so each has its own plan.
Using the required monthly saving in a real decision
Automating the transfer on payday is more reliable than depending on what is left over.
When the result stops applying
The projection uses a steady return and level deposits, while real returns vary and income changes over decades. A goal in future dollars is worth less in real terms, so a goal set today should be inflated. Taxes on gains and interest reduce what you keep. Fees on the account reduce the growth.
What to compare it with
See how long a smaller deposit takes with the time to save calculator, and check what return your plan needs with the required interest rate page. The savings growth calculator projects an existing plan, and the emergency fund page sets a cash reserve. For retirement goals, the retirement goal and required contribution calculators are built for the purpose.
Worked examples for the Savings Goal Calculator
2 real questions people ask, each worked through with this calculator at its own numbers.
Can $100,000 reach $1,000,000 in 25 years at 6%?
| Future savings goal | $1,000,000 |
|---|---|
| Current savings | $100,000 |
| Expected annual return | 6.0% |
| Years to goal | 25.0 years |
| Required monthly saving | $799 |
Ten times the money in twenty-five years at six percent, with nothing added. The honest answer is arithmetic, not opinion, and the result below settles it. What the calculation cannot settle is whether six percent is the right assumption for a portfolio you would actually hold for twenty-five years without touching.
If the answer is no, the lever is contributions instead of a higher assumed rate. Raising the assumption does not raise the outcome.
The goal is a nominal one. A million dollars in twenty-five years is worth much less than a million today, so the target may need to be larger to buy what you have in mind. The plan also assumes the starting amount is never touched, which is the assumption most likely to be false over a quarter of a century.
Restate the goal in today's money using an inflation assumption, then run the calculator again with the larger target. The gap between the two answers is how much the plan is understating what you need.
Can $50,000 reach $500,000 in 20 years at 6%?
| Future savings goal | $500,000 |
|---|---|
| Current savings | $50,000 |
| Expected annual return | 6.0% |
| Years to goal | 20.0 years |
| Required monthly saving | $724 |
Same multiple, shorter horizon. Twenty years instead of twenty-five is a meaningful difference at these rates, and the shortfall is not small. Worth running with monthly contributions added. That is usually the version of the question people actually mean.
Add a monthly contribution and re-run it. The gap between a lump sum alone and a lump sum plus regular saving is where the goal is decided.
Tenfold growth from a lump sum is a demanding goal at a moderate rate, and the calculation shows the shortfall plainly. What it does not show is how much regular saving would close it. Most people who hit a target like this do it through contributions, not through the starting balance, and the result is far less sensitive to the rate.
Find the monthly contribution that makes the plan reach the goal at six percent. Then check that figure against your budget. If it does not fit, change the target or the date instead of raising the assumed return.
People also ask
Frequently asked questions
How do I choose a realistic return?
Use a rate that matches the account: current APY for savings and CDs, and a conservative long-run figure for investments, not the best year you remember.
What if I cannot afford the monthly amount?
Lengthen the time, lower the target or look for a higher-return account, in that order. Raising the return assumption without changing the account is wishful.
Should I save for several goals at once?
Yes, but give each a separate account or label so you can see progress, and fund the emergency reserve and any employer match first.