Investment Calculator
Formula Used
Net annual return = expected annual return − annual fees − tax drag.
Monthly return = (1 + net annual return)1/12 − 1.
End month balance = previous balance × (1 + monthly return) + monthly contribution.
If beginning timing is selected, the contribution is added before monthly growth.
Real balance = nominal future balance ÷ (1 + inflation rate)years.
Target portfolio = desired annual income ÷ withdrawal rate.
Future target = target portfolio today × (1 + inflation rate)years.
How To Use This Calculator
- Enter your current age and target age.
- Add your current balance and any one time investment.
- Enter your monthly contribution and yearly increase.
- Adjust return, fee, tax, and inflation assumptions.
- Add your desired monthly income goal.
- Press calculate to view the result above the form.
- Download the yearly projection as CSV or PDF.
Example Data Table
| Input | Example Value | Meaning |
|---|---|---|
| Current balance | $25,000 | Amount already invested |
| Monthly contribution | $800 | New money added each month |
| Expected return | 7% | Annual growth before costs |
| Fees and tax drag | 0.75% | Annual reduction from return |
| Inflation | 3% | Purchasing power adjustment |
| Withdrawal rate | 4% | Income estimate from portfolio |
Why This Investment Calculator Helps
A strong investing plan needs more than a single return number. It needs deposits, time, fees, taxes, inflation, and a final income goal. This calculator brings those parts together in one simple workflow. It follows a practical money planning style. You enter what you invest now. You add expected future contributions. Then you compare the result with the lifestyle income you want later.
Planning Around Monthly Action
Many investors focus only on market performance. That is risky thinking. Your monthly contribution is the part you control most. A higher starting deposit, a steady increase each year, and lower drag from fees can change the final balance a lot. The tool also compares your selected contribution with an investing rate based on monthly income. That view helps you see whether your habit matches your target plan.
Using Real and Nominal Results
Future money can look large, but inflation lowers buying power. That is why the calculator shows nominal value and real value. Nominal value is the projected account balance in future dollars. Real value adjusts that balance back to today’s purchasing power. This makes the goal check more useful. It helps you avoid a false sense of progress.
Reading the Goal Gap
The target section converts your desired monthly retirement income into a portfolio target. It uses a withdrawal rate that you choose. A lower withdrawal rate needs a larger portfolio. A higher rate needs less, but may carry more risk. The required monthly contribution estimate works backward from that target. It gives a practical number to test.
Building Better Decisions
Use the projection as a planning guide, not a promise. Returns will change. Taxes may change. Your income can change too. Run several cases. Try a conservative return. Test higher fees. Add inflation stress. Then compare the results. A good plan should still make sense when assumptions are not perfect. This calculator supports that review with yearly rows, downloads, and clear formulas.
Simple Review Routine
Review the numbers every few months. Update income, balances, and contribution plans. Keep one base scenario, one cautious scenario, and one ambitious scenario. This habit turns a calculator result into a repeatable planning check before making major financial decisions carefully.
FAQs
1. What does this investment calculator estimate?
It estimates future portfolio value, inflation adjusted value, income potential, target progress, and required monthly investing based on your assumptions.
2. Is this calculator affiliated with Ramit Sethi?
No. It uses a practical planning style and user-controlled inputs. It is not an official or affiliated tool.
3. Why are fees and tax drag included?
Fees and taxes can reduce compounding. Including them gives a more realistic net return estimate before viewing long-term results.
4. What is the real balance?
Real balance adjusts the future portfolio for inflation. It shows estimated buying power in today’s money.
5. What does required monthly contribution mean?
It is the estimated starting monthly deposit needed to reach your future income target, using your selected assumptions.
6. Should I use a high return assumption?
Use several scenarios. A lower return can show risk. A higher return can show upside, but it should not be treated as guaranteed.
7. Why does contribution timing matter?
Beginning-month contributions grow for slightly longer. Over many years, that timing can create a small difference in final value.
8. Can I download my results?
Yes. After calculation, use the CSV or PDF buttons to save the projection summary and yearly table.