SIP Calculator — How Systematic Investment Plan Returns Are Calculated
Understand how SIP returns are calculated using compound interest. Includes formula, worked examples, and comparison table for different investment amounts and durations.
Introduction
Systematic Investment Plan (SIP) is the most popular way Indians invest in mutual funds — over 7 crore SIP accounts are active today. But how exactly are SIP returns calculated? Unlike a lump sum investment, SIP involves multiple investments over time, each compounding for a different duration. Understanding the math helps you set realistic expectations and choose the right monthly amount.
⚠️ Disclaimer: SIP returns depend on market performance and are not guaranteed. Past returns do not predict future results. Consult a SEBI-registered financial advisor before investing.
What is SIP?
SIP allows you to invest a fixed amount (e.g., ₹5,000) into a mutual fund every month. Each installment buys units at the current NAV (Net Asset Value). Over time, you benefit from:
- Rupee cost averaging — buying more units when prices are low
- Compounding — returns on returns over long periods
- Discipline — automated monthly deductions prevent emotional decisions
The SIP Formula
M = P × ((1 + i)^n – 1) / i × (1 + i)
Where:
- M = Maturity value (total corpus)
- P = Monthly SIP amount (₹)
- i = Monthly rate of return (annual rate ÷ 12 ÷ 100)
- n = Total number of months
Worked Example: ₹5,000/month for 5 years at 12% annual return
- P = 5,000
- i = 12% ÷ 12 = 1% = 0.01
- n = 5 × 12 = 60 months
M = 5000 × ((1.01^60 – 1) / 0.01) × 1.01 M = 5000 × ((1.8167 – 1) / 0.01) × 1.01 M = 5000 × (0.8167 / 0.01) × 1.01 M = 5000 × 81.67 × 1.01 M = ₹4,12,432
Total invested: ₹5,000 × 60 = ₹3,00,000 Returns earned: ₹4,12,432 – ₹3,00,000 = ₹1,12,432
SIP Returns Comparison Table
Assuming 12% annual returns (historical equity fund average):
| Monthly SIP | 5 Years | 10 Years | 15 Years | 20 Years |
|---|---|---|---|---|
| ₹1,000 | ₹82,486 | ₹2,32,339 | ₹5,01,695 | ₹9,89,357 |
| ₹3,000 | ₹2,47,459 | ₹6,97,018 | ₹15,05,086 | ₹29,68,071 |
| ₹5,000 | ₹4,12,432 | ₹11,61,695 | ₹25,08,476 | ₹49,46,785 |
| ₹10,000 | ₹8,24,864 | ₹23,23,391 | ₹50,16,953 | ₹98,93,571 |
Key insight: ₹10,000/month for 20 years at 12% grows to nearly ₹1 crore — the power of compounding over time.
SIP vs Lump Sum Comparison
| Feature | SIP | Lump Sum |
|---|---|---|
| Investment style | Fixed monthly | One-time |
| Market timing risk | Reduced (rupee cost averaging) | High (entire amount at one NAV) |
| Minimum amount | ₹500/month | ₹5,000+ typically |
| Best for | Salaried individuals | Windfall/bonus money |
| Discipline | Automated, consistent | Requires active decision |
| In rising markets | Lower returns than lump sum | Higher returns |
| In volatile markets | Better risk management | Higher risk |
Common Mistakes
- Expecting fixed returns — 12% is an assumption; actual returns vary year to year
- Stopping SIP during market crashes — crashes are when you buy more units cheaply
- Ignoring expense ratio — fund fees reduce your effective return by 0.5-2.5% annually
- Not increasing SIP amount — a yearly 10% step-up significantly boosts final corpus
- Confusing CAGR with absolute returns — a fund showing “80% returns” over 5 years is ~12.5% CAGR, not 80% per year
Frequently Asked Questions
What is a good monthly SIP amount to start with?
Most financial planners suggest investing at least 20-30% of your monthly income. Even ₹500/month is a valid starting point — you can increase over time with step-up SIP.
Can I withdraw my SIP investment anytime?
Open-ended mutual fund SIPs can be redeemed anytime (subject to exit load in first year). ELSS (tax-saving) SIPs have a 3-year lock-in per installment.
Is SIP return guaranteed at 12%?
No. 12% is a commonly used assumption based on historical Nifty 50 returns over 15+ years. Actual returns vary — some years may be negative, others 20%+.
What happens if I miss a SIP installment?
Most AMCs allow 3 consecutive missed payments before cancelling the mandate. You don’t lose existing investments — just that month’s installment is skipped.
Should I choose growth or dividend option for SIP?
Growth option is better for wealth building — returns are reinvested and compounded. Dividend option pays out periodically but reduces compounding benefit.
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Tags: finance, investment, SIP, india, calculator
Last Updated: June 2026
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