A standard barbell typically weighs 45 pounds (20 kilograms). This is the most common type found in commercial gyms, usually about 7 feet long, made of steel with rotating sleeves for weight plates

. There are variations depending on the type and use:

• Standard barbells (often used in home gyms or classes) can weigh less, for example, 5 ft bars weigh around 12.8 lbs (5.8 kg), and 6 ft bars about 15 lbs (6.8 kg)

• Women's Olympic barbells usually weigh about 33 pounds (15 kg)

• Curling bars typically weigh around 25-32.5 pounds, and shorter bars can weigh 35 pounds

• Some specialty bars or less common gym bars may weigh differently, but 45 lbs is the universal standard for most Olympic-style barbells used in gyms

So, if you are referring to the typical barbell used for bench press, squats, and deadlifts in most gyms, it weighs 45 pounds (20 kg)