How to use the outputs?

Use weighted beta and volatility to see if the mix is still the risk level you think it is. Use yield and OCF together so the income sleeve does not hide an expensive structure. Check region and asset mix before calling the portfolio diversified.

ETF portfolio builder for UK investors

Build an ETF portfolio with weighted risk, cost and exposure analytics

This is the practical portfolio-construction layer for the ETF library. Blend the curated shortlist, assign weights, and see how beta, Sharpe, Sortino, volatility, yield, OCF and the regional mix change as the allocation changes.

Weighted betaMarket sensitivity

Sharpe / SortinoRounded risk-adjusted snapshot

OCF + yieldCost and cashflow together

Exposure mixRegion and asset split

By the UK Tax Drag editorial team · Reviewed 2 May 2026

Research snapshot

Last reviewed

23 April 2026

Who this is for

UK investors building a shortlist portfolio and wanting a cleaner view of how risk, yield and exposure change with weights.

Default answer

Start with the job of the portfolio, not the “best” single ETF. Then test whether the mix still makes sense after you see the weighted numbers.

Primary sources

Issuer product pages plus rounded in-house research metrics for relative comparison only.

Data, methodology and scope

Load a starting point

The easiest way to use the builder is to load a model, then change one sleeve at a time until the output matches the real job of the portfolio.

Save draft mixes on this device, export them as JSON, or generate a share link that reopens the exact allocation in the builder.

Portfolio builder

Choose ETF Open selected ETFs in compare

Benchmark compare

A professional portfolio answer gets better when you can say what it is being compared with. These cards benchmark the current mix against a one-fund global equity core, a classic cautious 60/40 shape, and an income-tilted route.

Portfolio analytics

Printable portfolio report

Use this builder as a report generator as well as a calculator. The report should show the portfolio job, target weights, weighted OCF, yield, beta, Sharpe, Sortino, volatility, drawdown proxy, region split, asset mix and professional watch-outs.

Report habit

Print after normalising to 100%, then write why each ETF is in the portfolio.

Metric caveat

Beta, Sharpe and Sortino are rounded research proxies for comparison. They are not live issuer factsheets or a forecast.

Quality check

Use the due diligence checklist before treating a high-yield, overlay, thematic or leveraged-looking product as a core holding.

Run due diligence Check overlap

Contribution, withdrawal and rebalance planning

Use these planning inputs to move from a static target mix into a more realistic workflow: how new money gets deployed, what a spending target implies, and where a live allocation has drifted too far from plan.

Current portfolio value Monthly contribution Withdrawal rate % Rebalance alert threshold %

Scenario stress views

These simple stress snapshots are there to make the portfolio discussion more honest. They are not forecasts or a substitute for full risk modelling.

Professional watch-outs

Editorial accountability

Open Trust Centre →

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.

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