Once you've decided that a kettlebell is exactly what you need for your training plan, you'll be faced with a decision: What size kettlebell should you get? What Size Kettlebell Should You Get? Kettlebell Weights for BeginnersSamuel suggests buying a 12-kilogram (26-pound) kettlebell, while Otey says anywhere from 12 to 20 kg (26 to 44 lbs) will suffice. Kettlebell training requires stability, balance, and coordination. Handle size : The diameter of the handle can vary, typically between 30 and 40 millimeters (mm).