Monthly Return Compound Calculator: What Does 2% a Month Become?
Type your return per month and see what a starting amount and monthly deposits become. It shows the true yearly rate, a likely range and what a losing stretch does to the result.
Your plan
Compounded every month.
2% a month compounds to 26.8% a year
For comparison, in our 2016–2025 data the S&P 500 returned +31.2% in its best calendar year, −18.2% in its worst, and averaged 14.7% a year.
That is above what the S&P 500 averaged in that decade.
Real monthly results are uneven, and an average month usually hides some losing months. Turn on "Show likely range" and look at the crash view below to see how bumpy the road can be.
About the comparisons
Pick comparisons above the chart (stocks, bonds, savings, gold, inflation or your own rate) to see how the same deposits would do elsewhere.
In 5 years you'd have
$10,000 you put in + $22,810 of growth
In plain EnglishOf your projected $32,810, you put in $10,000 (30%). The other $22,810 (70%) comes from modeled investment growth. Growth builds late: in year 5 your money earns $6,940, against $2,682 in year 1.
24% compounded monthly grows 26.82% in a real year (the effective yearly rate). At that pace money doubles about every 2.9 years (the Rule of 72 says 2.7).
Your horizon is 5 years, so waiting 5 means never starting.
Reached in 19 years 5 months
That's after your 5-year horizon.
In 5 years $1,000,000 would buy what $862,609 buys today (at 3% inflation).
How your money grows
Grey is what you deposited; green is growth on top.
Deposits are made at the start of each month. Comparison lines use the same deposits.
What would it take to reach $1,000,000?
Four ways to get there. Each one changes only that number and leaves everything else as you set it above.
The goal is in future dollars. Whole dollars, rounded up so each answer reaches the goal. A required return is a yearly figure compounded the way you set it above.
How long will the money last?
Saving is half the story. Once you start taking money out, the balance keeps earning while it shrinks. See how long it lasts, and the most you could take each month. Open the full retirement withdrawal calculator
The first month. Taken at the start of each month.
The money runs out after 2 years 3 months
That is 27 years 9 months short of the 30 years you planned.
Hypothetical: the money earns a steady 24% a year, compounded monthly, and the withdrawals come out at the start of each month. Real returns are uneven, and a bad market early in retirement does far more damage than the same average spread evenly. The 4% rule of thumb comes from past US market data and is not a guarantee. Taxes on the withdrawals are not included (see the tax view). For education, not advice.
Compare up to three plans
Set up a plan above, save it, change something (the return, the deposit, the years) and save it again. Each plan keeps the numbers it was saved with.
The last button fills all three with your current plan at a steady 4%, 7% and 10% a year. Those are made-up rates to show how much the return matters, not predictions.
What if the market crashes?
Pick two moments for the same crash. It can land early, when you have little invested, or late, when you have a lot. See how much the timing changes where you end up.
Crash A and Crash B are set to the same year, so there is only one crash to show. Move one of them to compare an early crash with a late one.
Hypothetical: in the crash year the market falls 30% over the twelve months; every other year earns your 24%, with no extra rebound afterwards. Deposits keep going all the way through, and compounding is monthly. Real crashes and recoveries look different, so this shows the effect of timing, not a forecast.
What taxes do to the same plan
Before taxes your plan ends at $32,810. Here is what you would keep in each kind of US account.
Tax-free growth. You pay income tax before the money goes in, and nothing when you take it out.
No tax on the way out
Tax-deferred. Deposits skip income tax today, and the whole balance is taxed as income when you withdraw it.
Taxes take $7,218 by the end: 22% income tax on the withdrawal.
Taxed along the way. Dividends are taxed every year, and the gain is taxed when you sell.
Taxes take $3,547 by the end: $212 paid on dividends along the way and $3,187 on the gain at the end, plus the growth that dividend tax money would have earned.
This only shows the tax at the end, so do not use it alone to pick between a Roth and a traditional account: Roth deposits are made with money that was already taxed, traditional deposits are not.
US federal rates only, set by you. Not included: state taxes, deposit limits and income limits for retirement accounts, early-withdrawal penalties, employer matches, and tax rules that change. For education, not tax advice.
Sources and method
How the projection is calculated
- It runs month by month: each month your deposit goes in, the money earns its interest, and the interest is added at the compounding date you pick (daily, weekly, monthly, quarterly, yearly or continuous).
- Deposits at the start of the month earn that month’s interest; deposits at the end start earning the next month. A deposit made partway through a compounding period only earns interest for the months it was invested.
- Yearly fees come out of the return (an 8% return with a 0.5% fee grows at 7.5%). Inflation never changes the balance; it only changes the “today’s dollars” figures.
- The math is checked against textbook formulas (lump sums, annuities, fees, goals and taxes) by an automated test suite, with no rounding along the way.
- Daily, weekly and continuous compounding are worked out as the exact growth per month of that frequency, which is precise because deposits only ever land on month boundaries. Weekly and 2-week deposits are treated as an even flow through the month; a yearly deposit lands once a year.
- The withdrawal section takes the money out at the start of each month, then lets the rest earn that month’s growth at a steady rate. The “most you could take” answer is exact, the same way: the ending balance falls in a straight line as the withdrawal rises.
- What it would take to reach a goal (deposit, starting amount, return, time) solves for one number at a time with everything else unchanged. The return is found by narrowing in on it, because more return always means more money.
- The “how much per month” answer is exact, not a guess: the ending balance rises in a straight line with the deposit, so two runs of the same engine pin down the number.
Comparison lines and the 2016–2025 replay
- Real monthly returns, January 2016 to December 2025 (120 months), downloaded October 23, 2026. Each fund’s return is the change in its dividend- and split-adjusted price from one month’s last trading day to the next, so dividends are reinvested and the fund’s own fees are already inside the number (they are not taken out twice). Source: Yahoo Finance.
- Inflation uses the US Consumer Price Index for All Urban Consumers (CPI-U, not seasonally adjusted) from the St. Louis Fed’s FRED database, month over month.
- 60/40 is 60% S&P 500 and 40% bonds, rebalanced every month.
- In Projection mode, the S&P 500 line grows at 10.5% a year and global stocks at 7.5%, commonly cited long-run averages used as assumptions. Every other line grows at its own 2016–2025 pace, shown below. Inflation uses your setting and the custom line uses your rate.
- The “likely range” band re-draws 400 possible paths by shuffling the S&P 500’s actual monthly changes around your average return, and shows the 10th to 90th percentile. It uses a fixed seed, so the same inputs always give the same band.
| Line | Data | Pace 2016–2025 |
|---|---|---|
| S&P 500 | SPY | 14.7% a year |
| Nasdaq 100 | QQQ | 19.4% a year |
| Global stocks | VT | 11.8% a year |
| Small companies (Russell 2000) | IWM | 9.5% a year |
| Dividend stocks | SCHD | 11.5% a year |
| US bonds | AGG | 2.0% a year |
| T-bills / savings | BIL | 2.0% a year |
| Gold | GLD | 14.6% a year |
| US inflation (CPI-U) | CPI-U | 3.2% a year |
Read this before trusting any number
- The past is not a forecast. 2016–2025 was an unusually strong decade for US stocks, which is why the S&P 500’s pace above is higher than the 10.5% used for projections.
- A steady yearly return never happens in real life. The likely-range band and the crash view show how bumpy the road can be.
- Not included unless you turn them on: taxes (see the tax view), trading costs, advisor fees beyond what you enter, and the gap between an index and what you could actually buy.
- For education only. Not investment, tax or legal advice.
What a monthly return really becomes
A monthly return looks small until it compounds. Each month starts from the balance the last one left, so 1% a month is more than 12% a year, and 5% a month is far more than 60%. The table shows what $10,000 becomes at several monthly returns, with nothing added.
| Per month | Per year | 1 year | 3 years | 5 years | 10 years |
|---|---|---|---|---|---|
| 0.5% | 6.2% | $10,617 | $11,967 | $13,489 | $18,194 |
| 1% | 12.7% | $11,268 | $14,308 | $18,167 | $33,004 |
| 2% | 26.8% | $12,682 | $20,399 | $32,810 | $107,652 |
| 3% | 42.6% | $14,258 | $28,983 | $58,916 | $347,110 |
| 5% | 79.6% | $17,959 | $57,918 | $186,792 | $3,489,120 |
Steady monthly returns, compounded monthly, nothing added or withdrawn. The bigger rows are shown to illustrate the math, not as something markets deliver.
The other side: losing months
Compounding works against you too. After a loss, the balance is smaller, so the same percentage gain adds less. To get back to even you need a bigger gain than the loss:
| If you lose | You need to gain |
|---|---|
| 5% | 5.3% |
| 10% | 11.1% |
| 20% | 25.0% |
| 30% | 42.9% |
| 50% | 100.0% |
This is why the calculator offers a likely range and a crash view next to the steady line. To see how a plan compares with real markets, turn on the benchmark lines above. For a longer plan with deposits, use the compound interest calculator, and to practice without risking money, try the trade simulator.
Common questions
What is 2% a month per year?
2% a month compounds to about 26.8% a year, not 24%. Multiplying by 12 gives 24%, but each month starts from a bigger balance, so the extra growth adds up. The calculator shows this as the effective yearly rate under the return box.
How much is $10,000 worth after 5 years at 2% a month?
With nothing added, $10,000 grows to about $32,810 after 5 years at a steady 2% a month. Add a monthly deposit in the calculator to see the difference it makes.
Is 2% a month a realistic return?
Sustaining it is very hard. 2% a month is about 26.8% a year, every year. In our 2016–2025 data the S&P 500 averaged 14.7% a year and its best calendar year was 31.2%. A strategy can have a 2% month, but a steady 2% every month with no losing months is not what markets normally deliver, so treat any plan that assumes it as a best case.
How do I enter a monthly return?
In the return box, choose "per month" instead of "per year" and type the monthly figure, for example 2. The calculator credits the return every month, so the compounding is already monthly.
What happens when a month loses money?
Losses hurt more than the same gain helps. A 10% loss needs an 11.1% gain to get back to even, a 20% loss needs 25% and a 50% loss needs 100%. That is why a plan that assumes only winning months can look far better on paper than it is in practice. The crash view in the calculator shows how a drop early compares with a drop late.
Do monthly deposits make a big difference?
Yes, especially over longer periods, because every deposit also starts compounding. Use the monthly deposit box in the calculator and compare the ending balance with and without it. The "how much do I need to save" tool solves it the other way round: it finds the deposit that reaches a goal.
Does this calculator guarantee returns?
No. It shows what a steady rate would produce. Real returns vary from month to month and can be negative. It is for education only.
The calculations, projections, and historical replay data generated by this simulator are provided strictly for illustrative, entertainment, and educational purposes. They do not constitute certified financial planning, legal, or investment advice, nor do they guarantee future market performance or compound yield. Financial markets carry substantial risk, and past performance is never indicative of future results. Taxes are only considered in the account-type view, using rates you set. We highly recommend conducting independent due diligence or consulting with a licensed fiduciary or financial professional before executing any investments. The operators of this platform assume no liability, responsibility, or warranty for potential software mathematical errors, omissions, or financial actions taken based on these outputs.