BIST 100's Confusing Numbers
Raw BIST 100 index levels cannot be compared naively across a long period. Display-scale changes, the exact start date and the difference between a price index and a total-return index can materially change the result.
Treat this as a historical price-index example ending on December 31, 2024. Reproduce the live result in the calculator with the same dates and currency.
How Currency Erases Your Gains
A nominal rise in lira does not imply an equal increase in purchasing power. A sound comparison uses historical FX for the same dates, inflation and—where available—a total-return index that includes dividends.
Does This Make BIST a Bad Investment?
Whether BIST 100 beat inflation in a particular window must be tested with real returns calculated over identical start and end dates. Concentrating in one country and currency also adds country, FX and sector risk.
- Measure FX risk separately: Compare TRY and USD outcomes over identical start and end dates
- Track real returns: Our calculator's inflation-adjustment feature is built exactly for this
- Sector matters: Banking, energy, and tech sectors move very differently from each other
1,000 TRY/Month DCA Simulation (5 Years)
Reproducible Calculation Steps
- Choose either the BIST 100 price index or a total-return index and do not mix them.
- Use the nearest common trading dates for the start and end.
- Calculate the nominal TRY result.
- Convert every cash flow with that date's USD/TRY rate to calculate a separate USD result.
- Show CPI-adjusted purchasing power as a separate real-return result.
Historical display-scale changes can make raw index points misleading. Use an adjusted series and identify the exact ticker and provider.
What Is Excluded
A price index excludes dividends. With a real fund or equity portfolio, withholding tax, commissions, fund expenses, reinvestment timing and FX spread can change the result. TRY nominal, USD and real return should therefore be shown as three distinct measurements.
How Should You Use the Result?
This analysis is designed to make assumptions visible and reproducible, not to declare one universal winner. Change the amount, start date, currency and contribution frequency in the calculator to see how sensitive the outcome is. Review the worst window as carefully as the best one before making a decision.
A real investment can differ because of execution price, bid-ask spread, commission, tax, product expenses and the data provider's closing-time convention. The figures are therefore a gross historical comparison, not a personal return or a forecast.



