A systematic investment plan estimate models equal contributions made every month and grown at a constant assumed annual return. This page calculates total contributions, a projected maturity amount and the ratio between them. Its formula treats each contribution as occurring at the beginning of a monthly period, so it is an annuity-due model. The result is a hypothetical illustration, not a promised return or a recommendation to buy an investment.
SIP Calculator (Systematic Investment Plan)
Form
Results
Total investment
0
Maturity amount
0
Investment multiplication factor
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Table of Contents
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What is SIP Calculator?
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How to Use This Calculator
- Enter a positive monthly contribution and select its currency.
- Enter a whole investment period and choose years or months. Years are multiplied by 12 to find the number of monthly contributions.
- Enter a nonnegative expected annual return. The page divides it by 12 to form a monthly rate, compounds every contribution, and applies one extra monthly factor for beginning-of-period timing.
When the rate is zero, projected maturity equals total contributions. The currency label does not convert exchange rates; it simply identifies the money unit used for both contribution and results.
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Formula Used
Monthly rate i = annual rate ÷ 100 ÷ 12.
Number of contributions n = years × 12, or entered months.
Total investment = P × n.
Beginning-period future value = P × [((1 + i)n − 1) ÷ i] × (1 + i).
At i = 0, future value is P × n. The multiplication factor is future value divided by total investment.
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Variables Explained
| Symbol | Meaning |
|---|---|
| P | The equal contribution deposited at the beginning of each modeled month. |
| n | The whole number of monthly contribution periods. |
| r | The constant annual return entered as a percentage. |
| i | The annual percentage converted to a monthly decimal rate. |
| Maturity amount | The formula’s projected balance after all modeled contributions and growth. |
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Worked Example
Invest $200 at the beginning of each month for 12 months with an assumed 6% annual return. The monthly rate is 0.06 ÷ 12 = 0.005. Total contributions are $200 × 12 = $2,400. The annuity-due formula gives a projected maturity amount of about $2,479.45 and an investment multiplication factor of about 1.03 after display rounding.
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Why Use This Calculator?
The gap between projected maturity and total investment is modeled growth under a smooth, fixed return. Actual markets move unevenly and can lose value. The timing and size of each real contribution, product performance, distributions and cash holdings will change the balance. A constant annual percentage is especially unlikely to describe every month of a long investment period.
Investor.gov explains that regular investing and compound growth can build value over time, while also emphasizing that all investments involve risk. Fees and expenses reduce the money left to earn returns, and this page does not deduct them, taxes or inflation. Run several return assumptions instead of relying on one optimistic line.
The formula assumes contributions at the start of each month. A product that deducts money at month end will have one fewer month of growth for each deposit and a slightly lower modeled value. Check account terms and independently review regulated disclosures before making decisions.
Keep a record of every assumption beside a saved projection: contribution date, period count, annual rate, compounding convention, fees and whether cash flows occur at the beginning or end of the month. This makes two estimates comparable. Increasing the contribution changes both total investment and maturity, while increasing the assumed return changes projected growth without changing money contributed. A longer horizon magnifies the effect of the rate assumption, which is why a small-looking difference can create a large gap in distant projections. Revisit the inputs as goals, costs and finances change.
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Common Mistakes
- Treating the entered return as guaranteed rather than hypothetical.
- Entering 0.06 for 6%; the percentage field expects 6.
- Choosing years while entering a number of months, which multiplies the period by 12.
- Ignoring that the formula assumes contributions at the beginning of each month.
- Leaving out fees, taxes, inflation and the possibility of investment loss.
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Frequently Asked Questions
Does the maturity amount represent a guaranteed return?
No. It is a projection from a constant rate. Actual investment returns fluctuate and the account may lose value.
Are contributions made at the start or end of each month?
The formula multiplies by one additional monthly growth factor, so it models deposits at the beginning of each month.
What happens when the expected return is zero?
There is no modeled growth. Maturity equals the monthly contribution multiplied by the number of contributions.
Does the estimate include fees and taxes?
No. Product charges, advisory fees and taxes can reduce the amount retained and compounding over time.
Can I enter part of a year?
The form accepts whole periods. Choose months and enter the total whole number of months for a period shorter than or between whole years.
What does the multiplication factor mean?
It is projected maturity divided by total contributions. A factor of 1.04 means the projection is about four percent above the money contributed, not a four percent annual return.
Why should I test several expected returns?
A range shows how sensitive the projection is to an uncertain assumption and helps avoid treating one smooth growth path as a forecast.
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Sources & References
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