Goal-Based SIP Calculator
Enter a target corpus and time horizon. The goal SIP calculator tells you the exact monthly SIP needed in India, with optional inflation and existing lump sum.
Most SIP calculators answer the question, what will my SIP grow to. The goal based SIP calculator answers the inverse, which is more useful in real life. You start with a number you actually need (a retirement corpus, a child's foreign education, a house down payment) and the calculator solves for the monthly SIP that gets you there. It accounts for an existing lump sum if you have one and inflates the target so you are working with future rupees rather than today's rupees.
Goal
Why use the Goal-Based SIP Calculator
Working backwards from a goal is how good financial plans are built. Saying 'I will start a ₹10,000 SIP and hope it works out' is a wish. Saying 'I need ₹3 crore in 25 years for retirement, accounting for 6 percent inflation, so the maths says ₹15,000 a month at 12 percent return' is a plan. The goal SIP calculator turns the latter into a single screen, so you can stress test your goal against your earning capacity and adjust either side if the numbers do not line up.
Benefits at a glance
Inflation adjusted target
₹1 crore today is not the same as ₹1 crore in 20 years. Apply 6 percent inflation and ₹1 crore today becomes roughly ₹3.2 crore in 20 years. The calculator inflates the goal so the SIP is sized for the rupees you will actually need.
Account for an existing lump sum
If you already have ₹5 lakh invested for the goal, that lump sum compounds independently and reduces the monthly SIP required. The calculator subtracts the future value of the lump sum from the inflated target before solving for the SIP.
Solve for the SIP, not the corpus
Most planners would have to run a regular SIP calculator a dozen times to find the contribution that hits the target. This calculator inverts the formula so the answer comes back in one shot.
Reality check on your goals
If the required SIP comes out to ₹80,000 a month and you can comfortably save ₹20,000, the maths is telling you to extend the horizon, lower the target, or accept higher equity exposure. Better to discover this now than at year ten.
How to use the Goal-Based SIP Calculator
- 1
Enter the target corpus in today's money
Use a number that makes sense in current rupees. ₹1 crore for a major life goal, ₹50 lakh for a child's higher education, ₹3 crore for a comfortable retirement. The calculator will inflate this to future value.
- 2
Set the time to the goal
Number of years from today. Twenty five years for retirement at 50 from age 25. Eighteen years for a child born today reaching college age. Ten years for a house down payment.
- 3
Choose the expected return
Twelve percent for an equity heavy portfolio is reasonable for goals more than seven years away. For shorter goals, blend in debt and use 8 to 10 percent. Returns are never guaranteed, so build in a margin of safety.
- 4
Set the inflation rate
Six percent matches India's long run consumer inflation. Use 7 to 8 percent for goals heavily exposed to education or healthcare costs, which inflate faster than the headline CPI.
- 5
Add an existing lump sum if applicable
If you already have an investment earmarked for this goal, enter it. The calculator will compound it forward and reduce the required monthly SIP accordingly.
Frequently asked questions
How is the required SIP computed?
The calculator inflates the target corpus by the chosen inflation rate over the horizon. It then computes the future value of any existing lump sum at the chosen return. The remaining gap is solved for the monthly SIP using the standard future value of annuity formula, expressed in monthly terms.
Should I use real return or nominal return?
The calculator uses nominal returns and inflates the target separately, which is the cleaner way to model real world rupees. If you prefer real returns, set inflation to zero and reduce the expected return by the inflation you would otherwise have applied. The final SIP comes out close to identical.
What if the required SIP is higher than I can afford?
You have four practical levers. Extend the horizon (an extra five years often halves the SIP). Lower the target (do you need ₹3 crore or is ₹2.2 crore enough). Increase the expected return by raising equity allocation (carries more risk). Use a step up SIP that grows with your salary (this calculator assumes a flat SIP for the solve, but a step up SIP at a smaller starting amount often reaches the same target).
How does the existing lump sum input work?
If you have ₹5 lakh already invested today and your goal is 20 years away at 12 percent expected return, that lump sum grows to roughly ₹48 lakh by year 20. The calculator subtracts that future value from the inflated target before solving for the monthly SIP, so you do not double count the existing investment.
Is 6 percent inflation the right number for India?
Six percent is close to the long run average of India's Consumer Price Index. Healthcare and education costs have inflated faster, often 8 to 10 percent. For a child's foreign education, lifestyle inflation often takes the effective rate to 8 percent or more. For a generic retirement target, 6 percent is a defensible default.
Can I goal plan for a foreign education or wedding?
Yes. Both work, and inflation matters disproportionately because the costs grow faster than headline CPI. For foreign education, set inflation to 8 to 10 percent and the target to current cost in INR. For a wedding, 7 to 8 percent inflation is reasonable. The calculator will quote the monthly SIP that meets the inflated target.
What if I expect lump sum bonuses each year?
Treat them as one off lump sums and add them as additional purchases when they happen. The calculator solves for a flat monthly SIP, so annual bonus inflows are best handled separately by allocating them to the same fund as a lump sum each year. Over time the maths works out close to a SIP plus annual top up.
Final word
Goal based investing turns a vague hope into a number you can act on every month. Use the calculator before you start a new SIP for a specific goal, and rerun it each year to check whether you are still on track or need to step up the contribution. If the required SIP looks too steep, the FIRE calculator and the inflation calculator together will help you pressure test the assumptions behind the goal itself.
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