SIP Corpus Calculator
Work backwards from your goal — enter the corpus you want and find the monthly SIP required to reach it, allowing for any amount you have already invested.
Inputs
Report details (optional — appears on the PDF report)
Results
Formula
- Target = corpus you want · E = existing investment today
- i = monthly return · n = months to the goal
- P = the monthly SIP that closes the remaining gap
How It Works
This is the SIP formula solved in reverse. Any money you have already invested is first grown forward to the goal date and subtracted from the target — that portion is already taken care of.
Whatever gap remains is divided by the growth factor of a monthly annuity, giving the exact instalment needed each month to land on the target.
Worked Example
Given: Target ₹1,00,00,000 in 15 years at 12% p.a., no existing investment
i = 0.01 · n = 180 · (1.01)180 = 5.99580
Annuity factor = (5.99580 − 1)/0.01 × 1.01 = 504.58
P = 1,00,00,000 / 504.58 ≈ ₹19,819 per month
Total contributed ≈ ₹35.67 lakh; the remaining ₹64.33 lakh comes from compounding.
Engineering Notes
- If your existing investment alone already exceeds the target at maturity, no further SIP is required.
- Assumes a constant return; build in a buffer or review annually since markets vary.
- For a goal far in the future, set the target in inflation-adjusted terms — today's ₹1 crore will not buy the same in 15 years.
- Taxes, expense ratio and exit loads are not deducted.
FAQ
What if the required SIP is unaffordable?
Extend the timeline, lower the target, or start smaller and use a step-up SIP that rises each year.
Should the target account for inflation?
Yes — inflate your goal to its future cost before entering it here.
Can I include an existing lump sum?
Yes — enter it and the calculator reduces the SIP needed accordingly.
Related Calculators
This calculator uses established formulas and standard calculation methods to provide reliable results for planning, estimation and reference.