What matters

These are the exact 45mm Wi-Fi configurations, and their common baseline is unusually strong. Both use a 45mm by 12.3mm case weighing 36.7 g, a 3000 nits display refreshing from 1 Hz to 60 Hz, and dual-frequency GPS. Both are rated for up to 40 hours with the always-on display or 72 hours in battery saver, with the same 15 minutes, 30 minutes, and 60 minutes charging milestones. A new generation does not buy a larger screen, lighter case, or better stated endurance here.

Key differences

  • Pixel Watch 5 moves to 64 GB storage, Wear OS 7, and a 465 mAh battery; Pixel Watch 4 has 32 GB, Wear OS 6, and a 455 mAh battery. The doubled storage gives offline music and app-heavy use more room, while light users may see little practical gain from the capacity change.
  • Google listed Pixel Watch 5 45mm Wi-Fi at USD 429.99 in preorder for September 3, 2026 availability, while Pixel Watch 4 45mm Wi-Fi was USD 399.99. The observed USD 30 gap pays for storage and a newer software baseline, not a better official endurance rating or faster charging milestones.
  • Neither compared configuration includes LTE service. If you leave your phone behind, these Wi-Fi models cannot inherit standalone calling or data behavior from cellular variants, so buyers needing independent connectivity must compare the cellular versions and plan costs instead.

Who it is for

  • Choose Pixel Watch 5 45mm Wi-Fi if you keep substantial offline music or many apps on the watch, want the newer Wear OS baseline, and accept the preorder timing and higher price.
  • Choose Pixel Watch 4 45mm Wi-Fi if its storage is sufficient and you want the same core size, display, weight, GPS, endurance rating, and charging pattern for less.

Watch-outs

  • Keep the variant exact: these are Wi-Fi models, not LTE models. Health, emergency, and connectivity features can also depend on region, paired phone, account, and regulatory support.
  • Bands, charging accessories, a compatible Android phone, and any later move to a cellular plan can cost more than the device-price difference. Check the full ownership setup, not just the watch price.
  • Buy neither exact model if standalone LTE is essential, or if your current watch already meets your health, battery, and storage needs.