Home / Calculators / ETF overlap checker for UK investors
In a nutshell
Check overlap between ETFs for UK investors using role, exposure, structure and regional concentration so you can spot duplicate sleeves before buying…
How much do two ETFs you hold actually overlap?
A "diversified" portfolio that holds VWRL plus a US equity ETF plus an S&P 500 tracker is not as diversified as it looks — the same companies appear in all three with different weights. Overlap above ~60% means a meaningful chunk of your portfolio is doing the same thing in multiple places, paying multiple expense ratios for the same exposure.
This tool compares two ETFs by named holdings and weight, returns the overlap percentage, and flags whether the combination is a real diversifier or duplicate exposure. For UK investors the canonical overlap traps are global trackers with US large-cap tilt funds, and FTSE 100 with FTSE All-Share.
Research snapshot
Last reviewed
23 April 2026
Who this is for
Investors deciding whether to own both funds, switch one, or stop treating two similar ETFs as diversification.
Default answer
If two ETFs are doing the same portfolio job, compare them hard. If not, do not pretend they are substitutes.
Primary sources
The ETF shortlist, issuer documents, and the same region/structure dataset used in the builder and compare tool.
Quick pairs to test
VWRP vs SWDA
CSPX vs VUSA
AGGU vs VAGP
VHYL vs WINC
ETF A
ETF B
About this calculator
Last reviewed: June 2026. Reviewed by the UK Tax Drag editorial team against current HMRC guidance and the 2026/27 UK tax year.
Verified against: FCA InvestSmart — investing basics (checked on the last review date above).
Source: calculator JavaScript is unminified at /assets/ — see Open methodology for how to verify the math. Updates tracked in the changelog .
Disclaimer: This tool gives a guideline estimate using current published UK rates and thresholds. It is general information, not personal financial, tax, or legal advice. Verify the figures against your own circumstances, the latest gov.uk guidance, and a qualified adviser before acting. UK Tax Drag accepts no liability for decisions made on the basis of these calculations.
Every page is reviewed against the editorial standards, written from primary sources, sourced openly, and corrected publicly. No affiliate revenue. No sponsored content. No paid placements.