How it works
Enter a monthly investment, an optional lump sum, the expected annual return and the years. Monthly amounts are treated as invested at the start of each month and compounded monthly — the standard SIP projection method.
Future value = monthly × (((1+r)ⁿ − 1) ÷ r) × (1+r) + lump × (1+r)ⁿ
The formula, explained
- r is the monthly return (annual return ÷ 12), n the total months.
- Set the monthly amount to 0 to project a lump sum alone.
- Tax, fees and inflation are not included, so real purchasing power will be lower.
Tips
- Starting early beats investing more later — compounding accelerates in the back half.
- Test a lower return too (for example 8% instead of 12%) to see a conservative case.
- This is a projection, not investment advice or a guaranteed return.
Standards and sources
- Future value of an annuity-due with monthly compounding (standard finance mathematics)
- Reference only: markets fluctuate; past performance does not predict future returns
Last reviewed October 7, 2026
Frequently asked questions
How is the future value calculated?
Monthly contributions use the annuity-due formula (invested at the start of each month), compounded monthly. For example, 10,000 a month at 12% for 10 years projects to about 2,323,391.
Is the return guaranteed?
No. The rate you enter is an assumption; real markets rise and fall. Treat the result as a projection, not a promise.
Does it include tax or inflation?
No. Capital gains tax, fees and inflation are not included, so real purchasing power will be lower.
What if I invest only a lump sum?
Leave the monthly amount at 0. A lump sum of 10,000 at 10% for 1 year projects to about 11,047.