SIP + Lumpsum Combined Calculator
Estimate how a one-time investment and monthly SIP could grow together.
Year-by-year growth
See how your combined investment may grow at the selected return assumption. “Growth during year” is the change in projected value since the previous year.
| Year | Total invested | Projected value | Growth during year | Total growth |
|---|---|---|---|---|
| 1 | ₹2,60,000 | ₹2,90,000 | ₹30,000 | ₹30,000 |
Method: returns are a nominal annual assumption divided by 12 and compounded monthly. The lumpsum is invested at the start; SIP instalments are assumed to be invested at the start of each month (annuity-due). Values are estimates, not guaranteed outcomes.
A one-time investment and a monthly SIP can work toward the same goal. The SIP + lumpsum combined calculator estimates the future value of both, while showing how much you contribute and how much of the projected total comes from growth. Use this SIP + lumpsum combined calculator to model a bonus or existing savings alongside a regular monthly investment, rather than treating every rupee as if it were invested on the same date.
What does a SIP + lumpsum combined calculator show?
A lumpsum is a one-time investment, perhaps from a bonus or savings you have set aside. A Systematic Investment Plan (SIP) adds a chosen amount at regular intervals, usually monthly. The SIP + lumpsum combined calculator calculates each investment stream separately and adds their projected future values.
You can see four useful figures: the projected lumpsum value, projected SIP value, total amount contributed and estimated growth above contributions. The split helps you understand whether your result is driven more by the initial amount or by continuing monthly contributions.
How to use the SIP + lumpsum combined calculator
- Enter the one-time lumpsum you plan to invest now. Enter zero if there is no initial amount.
- Enter your monthly SIP. Enter zero if you only want to model a lumpsum.
- Set an expected annual return. This is an assumption you can change, not a forecast or a fund recommendation.
- Choose the investment period in years.
- Review the combined future value, total contributions, estimated growth and separate lumpsum/SIP components. Copy or share the summary if useful.
How are combined SIP and lumpsum returns calculated?
The SIP + lumpsum combined calculator uses one assumed return rate for both parts. It converts the nominal annual rate into a monthly rate and compounds monthly. The initial lumpsum is invested at the beginning of the period. SIP contributions are assumed to be made at the start of each month, so each monthly contribution receives one extra month of growth compared with an end-of-month convention.
FVL = L × (1 + i)n
SIP future value (start-of-month contributions)
FVSIP = P × [((1 + i)n − 1) ÷ i] × (1 + i)
Combined value
FVTotal = FVL + FVSIP
Here, L is the initial lumpsum, P is the monthly SIP, i is the monthly rate (annual rate ÷ 12 ÷ 100), and n is the number of months. If the assumed return is 0%, the lumpsum remains unchanged and the SIP value is simply the sum of contributions. The tool handles that case separately to avoid dividing by zero.
Worked example: ₹2 lakh plus ₹5,000 per month
The following figures were calculated in code using the same formula as the widget. They are rounded to the nearest rupee and are illustrative only.
| Input or result | Illustrative value |
|---|---|
| Initial lumpsum | ₹2,00,000 |
| Monthly SIP | ₹5,000 |
| Assumed nominal annual return | 12% |
| Period | 10 years |
| Total contributions | ₹8,00,000 |
| Projected lumpsum value | ₹6,60,077 |
| Projected SIP value | ₹11,61,695 |
| Combined projected value | ₹18,21,773 |
| Estimated growth above contributions | ₹10,21,773 |
The SIP component is larger in this example because monthly contributions continue throughout the full period. The initial amount still matters: it starts compounding earlier, but it is smaller than all the monthly contributions added together.
Sensitivity check: why the return assumption matters
Using the same ₹2 lakh initial investment, ₹5,000 monthly SIP and 10-year period, only the assumed annual return changes in this illustration.
| Assumed annual return | Combined projected value | Total contributions |
|---|---|---|
| 0% | ₹8,00,000 | ₹8,00,000 |
| 8% | ₹13,64,756 (approx.) | ₹8,00,000 |
| 12% | ₹18,21,773 | ₹8,00,000 |
The 8% row is a rounded illustration. For an exact result, enter 8% in the calculator. A small change in an assumed return can create a large difference over a long horizon, which is why the assumption deserves attention.
What people often miss when combining the two
1. The timing of the lumpsum is different from the SIP
The initial amount has the entire investment period to compound. Later SIP instalments have less time. That is why the two parts should be calculated separately rather than treating every rupee as if it was invested on day one.
2. A larger projection does not mean lower risk
Adding a lumpsum increases the amount exposed to the investment’s ups and downs from the start. A monthly SIP spreads contributions across time, but it does not prevent losses. Neither method guarantees a positive return.
3. Check whether your cash flow can support the SIP
The monthly amount should be considered alongside routine expenses, emergency savings and other financial commitments. A projection is useful only if its contribution schedule is realistic for you. The calculator does not judge affordability or recommend an asset allocation.
When is a combined projection useful?
This SIP + lumpsum combined calculator can help you model a few common situations: investing part of a bonus now while maintaining a salary-based SIP; adding a matured deposit to an ongoing investment plan; or checking how an existing amount changes a long-term goal. You can also set either input to zero to isolate the lumpsum or SIP component.
If you are comparing a one-time investment with spreading the same total amount over time, use a dedicated comparison tool and keep the total amount and assumptions consistent. A combined calculator answers “what could both streams become?”; a comparison calculator answers a different question about alternative contribution timing.
What this calculator leaves out
- Changing market returns: the model applies a constant rate, while real returns fluctuate.
- Fund costs: expense ratios and other applicable charges are not deducted separately. Use a return assumption that reflects the costs you want to allow for.
- Taxes: capital-gains tax and other tax effects are not included.
- Inflation: the result is a future rupee amount, not its purchasing power in today’s money.
- Contribution changes: the SIP is fixed; annual step-ups, skipped instalments and withdrawals are not modelled.
Use the SIP + lumpsum combined calculator result as a scenario, not a prediction. Mutual fund investments are subject to market risks. Read all scheme related documents carefully before investing.
Related calculators and resources
Use these related Stock Charcha tools to explore different parts of your investment plan:
- SIP Calculator — estimate the future value of regular monthly investments.
- SIP vs Lumpsum Calculator — compare two contribution approaches under consistent assumptions.
- Step-Up SIP Calculator — model an SIP that increases each year.
- Goal-Based SIP Calculator — estimate a monthly SIP for a target amount.
- SIP Stoppage Impact Calculator — explore how stopping contributions early can affect a projection.
- SIP for Retirement Calculator — estimate a retirement corpus and required monthly SIP.
- Browse all Stock Charcha calculators for more finance tools.
For investor education, visit the SEBI Investor website and the AMFI Investor Corner. Please also read our educational and financial disclaimer.
Written by Hasanraza Ansari. Founder of Stock Charcha. Stock market enthusiast, actively investing since November 2022.
Educational use only. This calculator does not provide personalised financial advice or recommend any investment product. Consider consulting a SEBI-registered investment adviser before making investment decisions.
Frequently asked questions
Can I invest a lumpsum and run an SIP at the same time?
This calculator models both contributions together. Whether a specific fund or platform supports your preferred transaction setup depends on that provider’s rules.
Does the calculator guarantee the combined future value?
No. It is a mathematical projection based on the annual return assumption you enter. Actual market returns may be higher or lower, including negative returns.
Why is the SIP value calculated separately from the lumpsum?
The lumpsum is invested at the beginning and compounds for the full period. Each SIP instalment is invested later and has a different amount of time to grow. Calculating them separately reflects that timing difference.
What happens if I enter a 0% return?
The calculator treats the return as zero: the lumpsum does not grow, and the SIP value equals the total monthly contributions. It avoids dividing by a zero monthly rate.
Are taxes, inflation and fund costs included?
No. The displayed amount is a nominal projection before separately modelled taxes, inflation and fund expenses. Those factors can materially change the outcome.