Fund overlap comparisons
How much any two of the ten most widely held index funds actually share. Overlap is the sum of the smaller weight in each fund across every security both own, computed after looking through each fund to the stocks and bonds inside it — not by comparing top-ten lists, which two S&P 500 funds share whether they overlap 100% or 60%.
| Comparison | Overlap | Effective Funds |
|---|---|---|
| SPY vs IVV | 99.8% | 1.0 |
| VOO vs IVV | 95.1% | 1.0 |
| VOO vs SPY | 95.0% | 1.1 |
| AGG vs BND | 93.9% | 1.1 |
| VOO vs VTI | 87.9% | 1.1 |
| IVV vs VTI | 85.8% | 1.1 |
| SPY vs VTI | 85.6% | 1.1 |
| QQQ vs VUG | 62.9% | 1.4 |
| VOO vs VUG | 57.7% | 1.4 |
| IVV vs VUG | 57.6% | 1.4 |
| SPY vs VUG | 57.6% | 1.4 |
| VOO vs QQQ | 54.6% | 1.5 |
| IVV vs QQQ | 54.1% | 1.5 |
| SPY vs QQQ | 54.1% | 1.5 |
| VTI vs VUG | 52.3% | 1.5 |
| VTI vs QQQ | 48.2% | 1.5 |
| IVV vs SCHD | 7.7% | 1.9 |
| SPY vs SCHD | 7.7% | 1.9 |
| VOO vs SCHD | 7.6% | 1.9 |
| VTI vs SCHD | 6.9% | 1.9 |
| QQQ vs SCHD | 5.0% | 2.0 |
| AGG vs VXUS | 2.4% | 2.0 |
| VTI vs VXUS | 2.0% | 2.0 |
| QQQ vs VXUS | 1.6% | 2.0 |
| BND vs VXUS | 1.1% | 2.0 |
| VOO vs VXUS | 1.0% | 2.0 |
| IVV vs VXUS | 1.0% | 2.0 |
| SCHD vs VUG | 0.8% | 2.0 |
| SPY vs VXUS | 0.8% | 2.0 |
| VTI vs AGG | 0.6% | 2.0 |
| VTI vs BND | 0.6% | 2.0 |
| VXUS vs SCHD | 0.6% | 2.0 |
| VXUS vs VUG | 0.6% | 2.0 |
| AGG vs VUG | 0.3% | 2.0 |
| BND vs VUG | 0.3% | 2.0 |
| VOO vs AGG | 0.2% | 2.0 |
| VOO vs BND | 0.2% | 2.0 |
| IVV vs AGG | 0.2% | 2.0 |
| IVV vs BND | 0.2% | 2.0 |
| QQQ vs AGG | 0.1% | 2.0 |
| QQQ vs BND | 0.1% | 2.0 |
| AGG vs SCHD | 0.0% | 2.0 |
| BND vs SCHD | 0.0% | 2.0 |
| SPY vs AGG | 0.0% | 2.0 |
| SPY vs BND | 0.0% | 2.0 |
Hold both halves of a pair and Effective Funds is what two tickers actually get you: 2.0 if they share nothing, 1.0 if they are the same basket. A measurement, not a grade.
Three-fund comparisons
Compare everything you own, not just two of them
A pair is one comparison. The number that matters is across your whole portfolio at once — every fund against every other, plus what you hold directly. Paste your holdings to see the real overlap and your own Effective Funds number. Free, no account, nothing stored.
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