Is 4.5 inch enough, or should I get a 5 or 6 inch grinder?

For most DIY, welding cleanup, and home metalwork, 4.5 inch is the sweet spot cited across r/Tools and r/Welding threads, lighter, cheaper wheels and easier control. Many top picks like the Makita XAG04Z, DeWalt DCG416B and Milwaukee 2880-20 accept both 4.5 and 5 inch wheels. Step up to 6 or 7 inch only if you're doing sustained heavy stock removal.