SIP Calculator
Calculate the future value of your systematic investment plan with regular monthly investments.
Quick Examples
Systematic Investment Plan (SIP)
SIP is an investment strategy where you invest a fixed amount regularly, benefiting from rupee cost averaging and compound growth.
SIP Formula
Where P = Monthly investment, i = Monthly rate, n = Number of months
Benefits of SIP
- Discipline: Regular investing builds wealth over time
- Dollar-Cost Averaging: Buy more units when prices are low, fewer when high
- Power of Compounding: Long-term growth multiplies returns
- Low Entry Barrier: Start with small amounts
Example Growth
| Monthly SIP | 10 Years @12% | 20 Years @12% | 30 Years @12% |
|---|---|---|---|
| $100 | $23,234 | $99,915 | $352,991 |
| $500 | $116,169 | $499,577 | $1,764,956 |
| $1000 | $232,338 | $999,154 | $3,529,912 |
Worked Example: How the Formula Works
Invest $1,000 per month for 12 months at 12% annual return. First convert the annual return to a monthly rate:
Then the maturity value is:
Total invested: $12,000. Estimated maturity value: about $12,809 — the extra $809 is one year of compounding. Some calculators instead use the effective monthly rate (1.12)^(1/12) − 1 ≈ 0.949%, which produces slightly lower projections; this calculator uses the annual ÷ 12 convention, so compare results on the same basis.
Why Time Matters More Than Amount
With $500/month at 12% annual return:
| Duration | Total invested | Est. maturity value | Growth |
|---|---|---|---|
| 10 years | $60,000 | $116,170 | $56,170 |
| 20 years | $120,000 | $499,574 | $379,574 |
| 30 years | $180,000 | $1,764,957 | $1,584,957 |
Doubling the duration from 10 to 20 years nearly quintuples the outcome. Duration is the single most powerful lever in a SIP.
Types of SIPs
- Regular SIP: a fixed amount every month — the classic plan.
- Step-up SIP: the monthly amount rises by a fixed percentage each year, matching salary growth. This calculator supports a step-up rate.
- Flexible SIP: the amount can be changed from month to month.
- Perpetual SIP: no fixed end date; it runs until you stop it.
SIP vs Lump Sum
| Feature | SIP | Lump sum |
|---|---|---|
| Investment style | Fixed amount at regular intervals | One-time bulk investment |
| Market timing risk | Lower — dollar-cost averaging smooths entry prices | Higher — everything rides on one entry point |
| Capital needed | Small to start | Large sum required |
| Best for | Regular earners building discipline | Windfalls or when markets look cheap |
Factors That Affect Your Returns
- Duration: more years give compounding more time to work.
- Monthly amount: higher contributions grow the final corpus directly.
- Expected return: depends on the fund and market conditions; equity funds fluctuate more than debt funds.
- Fees: expense ratios and exit loads reduce net returns.
- Inflation and taxes: calculators show nominal, pre-tax figures. Subtract inflation for the real picture.
- Consistency: pausing or stopping contributions cuts into long-term gains.
Choosing Your SIP Amount
A common budgeting guideline is the 50/30/20 rule: about 50% of take-home pay for needs, 30% for wants, and 20% for savings and investing — your SIP comes from that 20%. Start with an amount you can sustain every month, then step it up as income grows.
Goal-Based Planning: Working Backwards
Instead of asking "what will I get?", ask "what must I invest?" For a target corpus FV at monthly rate i over n months:
Example: to reach $500,000 in 20 years at 12% annual return (i = 0.01, n = 240), the annuity factor is about 999.15, so the required monthly investment is 500,000 / 999.15 ≈ $500/month.
Step-Up SIP: Growing Contributions with Income
With a 10% annual step-up on a $500/month plan at 12% return over 10 years, the projection reaches about $168,716 versus $116,170 without the step-up — on total contributions of about $95,624 (the monthly amount rises from $500 to roughly $1,180 in year 10). Matching your SIP to salary growth is one of the most effective upgrades available.
What Happens If You Pause or Stop
A paused SIP simply misses those contributions' compounding. Because early contributions do the heaviest lifting (a dollar invested in year 1 compounds for the full duration), skipping early payments hurts more than skipping later ones. If you must reduce, cut the amount rather than stopping entirely.
One-Time Top-Ups Alongside a SIP
A common hybrid: keep the regular SIP for discipline and add lump sums when bonuses or windfalls arrive. The lump sum gets maximum time to compound, while the SIP keeps averaging your entry price through market swings.
How Sensitive Is the Outcome to the Return Rate?
For $500/month over 20 years, small differences in the assumed return compound into large differences in the result:
| Annual return | Total invested | Est. maturity value |
|---|---|---|
| 8% | $120,000 | $296,474 |
| 10% | $120,000 | $382,848 |
| 12% | $120,000 | $499,574 |
A 4-point swing in the assumed return changes the outcome by over $200,000. Treat the return input as a scenario, not a forecast — run the calculation at a conservative rate too.
Start-Date Luck and Staying Invested
Two investors with identical SIPs can get different results depending on when they start, because early contributions buy at different prices. The defense is time: over 15–20+ years, start-date differences shrink as dollar-cost averaging accumulates across full market cycles.
The Hidden Cost of Fees
A 1% annual fee sounds small. On $500/month over 20 years at 12% gross return, the projection is $499,574. If fees drag the net return to 11%, the outcome falls to about $436,787 — the "small" fee costs roughly $62,787. This is why low-cost funds compound into such an advantage over decades.
SIP vs Recurring Deposit
| Feature | SIP (market-linked) | Recurring deposit (bank) |
|---|---|---|
| Returns | Variable; estimated, not fixed | Fixed rate, guaranteed |
| Risk | Market risk; value fluctuates | Negligible nominal risk |
| Liquidity | Usually redeemable anytime (exit loads may apply) | Premature withdrawal penalties |
| Best for | Long-term wealth building | Short-term, capital-safe saving |
How This Calculator Handles the Step-Up
Enter an annual step-up percentage and the monthly contribution grows by that rate each year — modelling salary-linked investing. The projection compounds each month's (possibly grown) contribution at the monthly rate, so the step-up's full power shows only over longer durations. Revisit the inputs yearly: a step-up you cannot sustain is worse than a smaller flat SIP you never miss.
Reviewing Your Plan
Re-run the calculation once a year with updated amounts and a realistic return assumption. If the projected corpus falls short of the goal, the levers are: invest more per month, extend the duration, or raise the step-up — in that order of reliability.