📆 Honest SIP Calculator: Correct Compounding + Partial Months
Updated: July 21, 2026
Most calculators divide the yearly return by 12 – a shortcut that ignores intra‑year compounding. We use the mathematically correct effective monthly rate. For fractional years like 5.3 years, we calculate full months plus a partial month with interest. That's the honest way.
📊 SIP return data and three common mistakes (with sources)
What do historical returns say? According to the National Stock Exchange (NSE), the NIFTY 50 Total Returns Index delivered a CAGR of approximately 13.9% from April 1999 to March 2024 (NSE India, Monthly Factsheets). However, returns vary by decade. For long‑term financial planning, a conservative estimate of 10–12% is widely used by advisors. Our calculator lets you set any return you want.
Mistake #1: Stopping SIP during a market crash. Data from the 2008 financial crisis shows that investors who continued their SIP through the downturn and the subsequent recovery earned annualised returns of 14–16% over the next decade. Those who paused locked in losses.
Mistake #2: Ignoring expense ratios. A regular plan with 1.5% expense ratio vs a direct plan with 0.5% can reduce your final corpus by 15–20% over 20 years. Always compare expense ratios before investing.
Mistake #3: Using unrealistic return expectations. Assuming 15%+ returns without understanding volatility leads to disappointment. Use our calculator with a range of returns (8%, 10%, 12%) to see possible outcomes.
🔍 How the blog quality checker works (metrics explained)
The tool analyzes five research‑backed metrics. All processing happens in your browser – no data is sent to any server.
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We look for any form of "to be" (is, are, was, were, be, being, been) followed by a past participle, and optionally a "by" phrase. Common false positives like "tired", "excited" are excluded. Active voice improves clarity – aim for less than 5% passive sentences.
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Words like "however", "therefore", "meanwhile" help readers follow your logic. The ideal range is 5–8 per 100 words. Fewer than 5 makes text feel choppy; more than 8 makes it mechanical.
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Google's SEO guide emphasizes descriptive headings. For posts over 800 words, fewer than 3 H2s suggests poor organization. Our checker counts H2 tags in HTML or plain text.
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Use the suggestions to improve your draft – but always prioritise natural flow over perfect scores.
📐 Formula reference (one place)
Effective monthly rate: r = (1 + R/100)1/12 − 1
Partial month SIP: full months + (monthly amount × fraction) × (1+r)fraction
Inflation‑adjusted value: FV / (1 + inflation)years
🧮 Real‑Time SIP & Lump Sum Calculator
| Year | Start (₹) | Interest (₹) | End (₹) |
|---|---|---|---|
| Press Calculate | |||
📊 Shortcut vs correct method: difference
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