What joule rating do I actually need in a surge protector?

For general electronics like lamps, TVs, and phone chargers, 1,000–2,000 joules is typically adequate. For desktop PCs, gaming consoles, and home theater gear, reviewers and electrical subreddits generally recommend 2,500 joules or more. For sensitive or expensive equipment, a 3,000–4,000+ joule rating plus a connected-equipment warranty is the safer choice. Whole-house SPDs are rated differently (in amps of surge current) and complement, rather than replace, point-of-use strips.