Understanding barbell sizes and which one suits your training.
Most gyms have a whole lineup of barbells, some long, some short, straight bars, and some with more curves than a mountain road. Grabbing the wrong one can make your session feel off, or your plates won't even fit. Picking the right one can save you from that awkward moment of loading a bar that doesn't match your rack, your hands, or your goals.
So, strap in and find out the standard barbell sizes you'll run into, including Olympic, power, short, and curved bars, and helps you figure out which one belongs in your home gym.
Barbell Sizes Chart
Not all bars are built the same. Olympic barbell size, standard barbell size, and curved barbell sizes have different weights, lengths, and shaft thicknesses. Here's a quick barbell size chart to keep things straight.
| Bar Type | Weight | Length | Shaft Diameter | Sleeve Diameter | Best For |
|---|---|---|---|---|---|
| Olympic (Men's) | 20 kg (44 lb) | 7.2 ft (2.2 m) | 28 mm | 50 mm (2") | Snatch, clean & jerk, general strength |
| Olympic (Women's) | 15 kg (33 lb) | 6.6 ft (2.01 m) | 25 mm | 50 mm (2") | Olympic lifts, smaller hands |
| Power Bar | 20 kg (44 lb) | 7.2 ft (2.2 m) | 29 mm | 50 mm (2") | Squat, bench, deadlift |
| Short Bar | 15 kg (33 lb) | 6 ft (1.83 m) | 28–29 mm | 50 mm (2") | Compact home gyms, lighter lifters |
| EZ Curl Bar | 6–14 kg (15–30 lb) | 4 ft (1.2 m) | 25–28 mm | 50 mm (2") | Curls, skull crushers, rows |
| Technique Bar | 5–7 kg (11–15 lb) | 5–7 ft | 25–28 mm | 50 mm (2") | Learning Olympic lifts, warm-ups |
| Standard (1" sleeve) | 7–11 kg (15–25 lb) | 5–6 ft | 25 mm | 25 mm (1") | Light home use, beginners |
The International Weightlifting Federation (IWF) sets the official specs for Olympic bars. For example, men’s bars must weigh 20 kg and women’s bars 15 kg. They also require 50 mm ends (sleeves) and specific shaft diameters. Most good gym bars use these same sizes, even if they aren’t certified for competitions.
How to Pick the Best Barbell Size for Your Home Gym
Which barbell you'll want to use depends on what you're lifting, how much space you have, and how the bar feels in your hands.
Match the Bar to Your Lifts
If you're doing a mix of squats, bench press, deadlifts, and overhead presses, a full size 7-foot Olympic or power bar is the go to. Power bars use a slightly thicker 29 mm shaft and stiffer steel, that keeps the bar from flexing with heavy loads. Olympic weightlifting bars have a thinner 28 mm shaft with more whip (intentional flex) so the bar bends during snatches and cleans. A good all-arounder like the Colorado™ Bar splits the difference and handles all the power cleans and heavy pulls you can throw at it.
Curls and skull crushers, and other isolation exercises are ideal candidates for an EZ curl bar (sometimes called a curved barbell) because they put your wrists in a more neutral position to prevent strain and overuse issues (if you're over 30, you feel me). Curved barbell sizes usually land around 4 feet and 15 to 30 pounds, so they won't take up much room.
Measure Your Rack
A full 7-foot bar needs about 48 inches of clear space between the uprights on your rack, plus room for the sleeves to stick out on each side. If your home gym is squeezed into a tight spot (like a garage corner, spare bedroom, or apartment), a 6-foot short bar is a worth a look. While you lose a little space to load plates, it can still hold plenty of weight for most lifters.
Think About Grip
Shaft diameter has a bigger effect on your training than you might think. Thicker bars can cut pulling performance quite a bit, with deadlift strength dropping as much as 28% on a 2-inch bar and row strength falling even more. That's fine if you're intentionally training grip, but if you want to move the most weight on your main lifts, stick with a standard 28 to 29 mm shaft. Lifters with smaller hands might prefer a 25 mm "women's" bar for comfort and control, and that applies to anyone regardless of gender.
For a deep dive on how different barbells match different types of lifting, our guide covers every specialty bar in the lineup.
Takeaway
A full size 7-foot, 20 kg Olympic or power bar will suit most people. If you don't have a lot of room to work with, a shorter 6-foot bar can save you some precious space. Adding a curl bar is ideal for more wrist friendly arm work, and its lighter weight is better for scaling smaller muscle-group lifts or for people not ready to do lifts like front raises with a 20 kg bar.
FAQs
What size barbell do gyms use?
If you walk up to a rack in a commercial gym, you're almost always grabbing the classic 7-foot Olympic bar. This heavy-duty bar weighs 44 to 45 pounds (20 kg) and has 2-inch sleeves for standard plates. It’s the workhorse you see on squat racks, bench presses, and deadlift platforms. Good gyms might also offer smaller 33 lb (15 kg) women's bars (great for those with smaller hands!), plus fun specialty bars like EZ curl bars and trap bars.
What barbell size for bench press?
The champion for bench press is usually the standard 7-foot Olympic bar (20 kg / 44 lb). You want a shaft that’s 28 to 29 mm thick. If you’re really pushing big weight, the 29 mm power bar is awesome because it’s super stiff and won't wobble or flex under a heavy load. If your home setup is tight, don't worry, a 6-foot bar will work as long as it clears your J-cups with room for plates on the sleeves.
Do I need a different bar for Olympic lifting and powerlifting?
Not really, especially when you’re starting out. While they have different personalities, a single bar can often handle both. Olympic bars (28 mm shaft) are built with fast spinning needle bearings and have a bit of whip (flex) for dynamic movements. Power bars (29 mm shaft) are much stiffer and use bushings, making them perfect for holding maximum static load. If you love both lifting styles, grab a hybrid bar or a great multipurpose bar. They cover the middle ground until you’re lifting such huge amounts of weight that the tiny differences truly matter.
Rachel MacPherson is a Certified Strength and Conditioning Specialist, Certified Personal Trainer, Nutrition Coach, and health writer with over a decade of experience helping people build strength and confidence through evidence-based training.
This article was reviewed by Rosie Borchert, NASM-CPT, for accuracy.
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