SIP calculator, with the working shown
What a monthly SIP grows to when every instalment is paid at the start of its month, with a step-up each year if you like, and what starting later costs when the end date stays the same.
Start-of-month instalments · monthly compounding · reviewed 13 Oct 2026
What it comes to
Future value after 20 years
₹1,30,31,761
₹18,000 a month for 20 years, at an assumed 10% a year, comes to ₹1,30,31,761, of which ₹43,20,000 is what was paid in.
- Monthly rate(1 + 10%)1/12 − 1, so twelve months come to 10%0.7974%
- Instalmentseach paid at the start of its month240
- Paid in240 × ₹18,000₹43,20,000
- Growtheach instalment compounding from the month it is paid₹87,11,761
- Future value₹1,30,31,761
Year by year
| Year | Each instalment | Paid in that year | Value at the year's end |
|---|---|---|---|
| 1 | ₹18,000 | ₹2,16,000 | ₹2,27,530 |
| 2 | ₹18,000 | ₹2,16,000 | ₹4,77,812 |
| 3 | ₹18,000 | ₹2,16,000 | ₹7,53,123 |
| 4 | ₹18,000 | ₹2,16,000 | ₹10,55,965 |
| 5 | ₹18,000 | ₹2,16,000 | ₹13,89,091 |
| 6 | ₹18,000 | ₹2,16,000 | ₹17,55,530 |
| 7 | ₹18,000 | ₹2,16,000 | ₹21,58,613 |
| 8 | ₹18,000 | ₹2,16,000 | ₹26,02,004 |
| 9 | ₹18,000 | ₹2,16,000 | ₹30,89,734 |
| 10 | ₹18,000 | ₹2,16,000 | ₹36,26,237 |
| 11 | ₹18,000 | ₹2,16,000 | ₹42,16,390 |
| 12 | ₹18,000 | ₹2,16,000 | ₹48,65,559 |
| 13 | ₹18,000 | ₹2,16,000 | ₹55,79,644 |
| 14 | ₹18,000 | ₹2,16,000 | ₹63,65,138 |
| 15 | ₹18,000 | ₹2,16,000 | ₹72,29,182 |
| 16 | ₹18,000 | ₹2,16,000 | ₹81,79,630 |
| 17 | ₹18,000 | ₹2,16,000 | ₹92,25,122 |
| 18 | ₹18,000 | ₹2,16,000 | ₹1,03,75,164 |
| 19 | ₹18,000 | ₹2,16,000 | ₹1,16,40,210 |
| 20 | ₹18,000 | ₹2,16,000 | ₹1,30,31,761 |
Starting later
- Starting now240 instalments₹1,30,31,761
- Starting 12 months later228 instalments, ending on the same day₹1,16,40,210
- What the delay costs10.7% of ₹1,30,31,761₹13,91,551
The rules it follows
- Paid at the start of the month. Each instalment grows for the month it is paid in, as a SIP debited on the 5th does. A calculator that pays at the end of each month shows less for the same SIP.
- An annual return, compounded monthly. 10% a year is (1 + 10%)1/12 − 1, about 0.7974% a month, so twelve months come to exactly 10%.
- A step-up after every twelfth instalment. With a 10% step-up, months 13 to 24 are 10% more than months 1 to 12, and so on.
- Starting later keeps the end date. Starting 12 months later means 12 fewer instalments, ending on the same day; the cost is the difference between the two values.
What it assumes
- The same return every month. Real returns vary from month to month, and a fund's can be negative for years.
- No tax, exit load or stamp duty is taken off; the return is after the fund's expense ratio.
- Every instalment is paid; none is skipped.
These are the sums Pocket's Goals page runs, and its SIPs are paid the same way.
The same sums in Pocket
Pocket works the same figures out from your own entries, on your own device, and keeps each one's working a tap away. It is free on Windows, macOS, Linux and Android: download Pocket.
Other calculators: Old vs new tax regime calculator · Net worth calculator. Pocket is a tracking and planning tool; these calculators work figures out, they are not financial, tax or investment advice.