Enter the benchmark return, the index fund’s tracking difference, the active fund’s expense ratio, and the outperformance you expect. This index fund vs active fund calculator shows the corpus each gives, and the breakeven alpha the active fund actually needs.
Index Fund vs Active Fund Calculator
Works out how much skill an active manager needs, after fees, to match a low-cost index fund.
Breakeven alpha is the gross outperformance the active fund needs, before its own fees, just to match the index fund’s net return.
Your result in detail
| Item | Index Fund | Active Fund |
|---|
Active fund corpus at different alpha levels
| Alpha (before fees) | Active net return | Active fund corpus |
|---|
Illustrative estimates. Alpha is an assumption you choose, not a prediction. Actual returns vary and are not guaranteed.
An active fund charging 1.5% against an index fund charging 0.2% is not starting from zero. Before a single rupee of genuine stock-picking skill shows up, the active fund manager is already behind by the fee gap. An index fund vs active fund calculator turns that gap into one number: the outperformance the manager actually needs.
How do you use this index fund vs active fund calculator in 3 steps?
- Enter your monthly SIP or lump sum, and the tenure you are investing for.
- Enter the benchmark return you expect, the index fund’s tracking difference, and the active fund’s expense ratio.
- Enter the alpha, the outperformance before fees, you want to test, then read the breakeven alpha and both corpus figures.
The Stock Charcha index fund vs active fund calculator separates the one thing you can know in advance, cost, from the one thing nobody can promise, skill.
How does the index fund vs active fund calculator find the breakeven alpha?
An index fund’s net return is the benchmark minus its tracking difference, the small gap between the fund and the index it tracks. An active fund’s net return is the benchmark plus whatever the manager adds, called alpha, minus the fund’s own expense ratio.
Breakeven alpha = Active fund expense ratio − Index fund tracking difference
This is the gross outperformance the active manager needs to deliver, before fees, just to leave you no worse off than the index fund. Below that line, the index fund wins. Above it, the active fund’s extra return more than covers its extra cost.
What does a worked example look like?
Take a ₹10,000 SIP for 20 years, a 12% benchmark, a 0.2% tracking difference and a 1.5% active expense ratio, with the active fund assumed to add no alpha. These figures are illustrative.
| Item | Index Fund | Active Fund |
|---|---|---|
| Net return | 11.80% | 10.50% |
| Estimated corpus | ₹97,24,759 | ₹81,75,968 |
The breakeven alpha here is 1.30%, the figure the index fund vs active fund calculator flags as the line to clear. At zero assumed alpha, the index fund corpus beats the active fund corpus by ₹15,48,791.
How does the active fund’s corpus change with its alpha?
Here is the same ₹10,000 SIP over 20 years, with the active fund’s alpha varied and everything else held constant.
| Alpha (before fees) | Active fund corpus |
|---|---|
| -2% | ₹95,76,45,50,16,47,086 |
| -1% | ₹9,28,55,36,89,89,11,274 |
| 0% | ₹90,86,42,31,42,67,58,144 |
| 1% | ₹8,95,53,41,76,74,55,17,312 |
| 1.3% | ₹17,81,11,11,64,63,74,88,896 |
| 2% | ₹88,75,95,85,83,71,00,80,000 |
At exactly 1.30% alpha, the active fund lands on the same ₹97,24,759 as the index fund. Every point above that is a genuine edge; every point below it is the fee gap working against you.
What does research say about whether active funds clear that line?
This is a genuinely debated question, and the honest answer depends heavily on the category and the period measured. SPIVA India, a scorecard published by S&P Dow Jones Indices, has in different recent reports shown roughly 66% to 92% of active large-cap funds underperforming their benchmark over 10 years, with the exact figure moving depending on the specific benchmark and period used. Some analysts have also questioned a 2024 change in SPIVA India’s large-cap benchmark, arguing it makes recent underperformance figures look worse than a like-for-like comparison would.
The picture looks different outside large-cap. In several recent SPIVA India periods, mid and small-cap active funds have shown majority outperformance, roughly half or more beating their benchmark, suggesting active management has had more room to add value in less efficient, less researched parts of the market. None of this guarantees any specific fund will land on either side of its own breakeven alpha. Stock Charcha’s calculator asks you to set your own assumption rather than supplying one.
What does this index fund vs active fund calculator leave out?
It assumes one steady alpha every year, while real active funds beat or trail their benchmark unevenly, sometimes for long stretches. It does not include capital gains tax, which our share capital gains tax calculator and expense ratio impact calculator can help with separately.
Past performance of any fund, index or active, does not predict future returns. This page names no specific fund and recommends none. Mutual fund investments are subject to market risks. Read all scheme related documents carefully before investing.
Where should you go after using the index fund vs active fund calculator?
To see the pure cost effect without the alpha question, use the expense ratio impact calculator. To compare mutual funds and ETFs more broadly, read ETFs vs mutual funds and the types of mutual funds.
The Mutual Funds section of the Charcha Knowledge Hub has more. Run the Stock Charcha index fund vs active fund calculator with your own fund’s expense ratio and decide what alpha you genuinely expect, not what you hope for.
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Last updated: 3 October 2026. SPIVA India figures checked on 3 October 2026 against several recent scorecard summaries; figures vary by report and period, so check the latest S&P Dow Jones Indices release directly.
Founder of Stock Charcha. Stock market enthusiast, actively investing since November 2022. About the author
Educational content only. This page names no specific fund and is not a recommendation to buy any index or active scheme. Please do your own research or speak to a SEBI-registered adviser before investing, and read our disclaimer.
Frequently asked questions
What is alpha in the index fund vs active fund calculator?
Alpha is the extra return, positive or negative, an active fund manager generates compared with the benchmark, measured before the fund’s own fees are deducted. You choose this number as an assumption; it does not predict any real fund.
Is a lower breakeven alpha always better for the active fund?
Yes. A lower breakeven alpha means the active fund needs less genuine outperformance to match the index fund, because its fee disadvantage is smaller, as the index fund vs active fund calculator shows directly.
Do all actively managed funds underperform their index?
No. Performance varies by category and period, and some funds and periods show active outperformance, particularly in mid and small-cap categories. SPIVA India data shows large-cap funds have struggled more consistently than other categories to clear their cost disadvantage.
What is tracking difference, and is it the same as the expense ratio?
Tracking difference is how far an index fund’s actual return falls short of its benchmark, and the expense ratio is usually its biggest driver, though not the only one. Use the fund’s own disclosed or historical tracking difference where available, rather than assuming it equals the expense ratio exactly.
Should I only invest in index funds based on this calculator?
This calculator shows a breakeven line, not a recommendation. Some investors prefer index funds for their lower cost and predictability, while others choose active funds for specific categories or strategies. Decide based on your own research and risk appetite, not this tool alone.