What size slow cooker should I buy?

Most reviewers point to 6 quarts as the sweet spot for a family of four to six — large enough for a whole chicken or roast with leftovers. Step up to 8–10 quarts if you regularly cook for gatherings, do big-batch meal prep, or want to fit a full turkey or large brisket. A 3–4 quart cooker is better for couples, singles, or side dishes.