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Updated year criteria 2026
Index Fund Growth Calculator
The Index Fund Growth Calculator estimates a investment and time value estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own index fund growth figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate the future value of the Index Fund by 3 Low (5%) / Medium (8%) / High (12%) assumptions with comparison table every 5 year
Calculated at end of period
Low assumption (5%/year)
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Assumed average (8%/year)
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High assumption (12%/year)
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Total cost: -
Comparison charts for every 5 year
Year
Cumulative cost
Low (5%)
Center (8%)
High (12%)
How to calculate the growth of an Index Fund
This calculator uses the Future Value formula to calculate the monthly value of an investment in an Index Fund, showing the 3 situation at the same time, helping you plan with a range of possible returns.
The return hypothesis.
Low 5%/year - For conservative planning, suitable for a period of slow market growth.
8%/year — Close to the long-term average of SET50 including dividends
High 12%/year - For the period of good market growth or S&P500 in the long term
Frequently asked questions
What is an index fund and why is it popular?
Index Funds are funds that invest in stock market indices, such as SET50 or S&P500, without a manager. Stock-selected funds have lower fees than active funds and generally yield better returns in the long term than managered funds.
How long is the return on the SET50 Index?
Return of SET50 Index in the long term 10-20 year averaged around 7-10% per year including dividends but there is high volatility in each year, some years may be negative 20-30% and some years may be positive 30-40%
What level of return assumption should be chosen for planning?
For conservative planning use 5%/year, for medium use 8%/year and for positive scenario use 12%/year. Most experts recommend planning with low-medium assumptions for safety.
What's the difference between an index fund and an ETF?
Index funds and ETFs invest in similar assets, but ETFs are traded all day like stocks, while Index funds are traded at the close of the day. ETFs tend to have slightly lower fees, but pay commissions for trading.
Check before using results
Summary before deciding
This calculation result is suitable for preliminary planning. Actual figures should be checked from documents or official sources before making important decisions.
The calculation is based on the information you enter on this page.
Special cases may require additional information.
It is recommended to record or compare the results with the related tools below.
Disclaimer: The results of the calculations are estimates only. Past returns are not guarantees of future returns. They are not financial advice.
English calculator guide
How to use the Index Fund Growth Calculator
Use this page to test a specific index fund growth scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the index fund growth estimate instead of relying on a generic example.
Build a baseline index fund growth case with figures that match your situation.
Run a second index fund growth case after changing the rate, period, quantity or other key assumption.
Record the difference between the two index fund growth results and the input responsible for it.
Inputs for the index fund growth estimate
For this index fund growth calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a investment and time value estimate for your scenario, not a guaranteed provider price or official decision.
How the index fund growth result is calculated
The calculator projects value over time from the entered amount, rate, period and contribution assumptions. Reusing the same index fund growth inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a index fund growth decision
Confirm any current rate, threshold or provider rule that could change the final amount. For index fund growth, Use the result as a planning estimate and confirm any rate, rule or threshold that may have changed before acting. Check the important inputs and any current provider or authority rules before using the result for a decision.
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Terminology, numeric values and calculator controls checked
Review formula structure, test cases, data sources, effective dates, and risk language accordingly.How to check our · There is no claim that an outside professional reviewed it. Unless the page directly states the name and qualifications. This content is therefore not individual advice.
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