How much weight should a dual monitor arm support?

Check both per-arm capacity and total. Most 24–27 inch monitors weigh 8–15 lbs; 32 inch and ultrawide panels can hit 18–25 lbs. Reviewers recommend leaving headroom: a 20 lb per-arm spec is fine for typical 27 inch monitors, but heavy curved ultrawides like the Samsung Odyssey G9 need heavy-duty arms in the 30–44 lb-per-arm range.