How Much Does a Barbell Weigh? (kg & lb Chart)
The bar is the first plate on the barbell. Before you can load a target weight you need to know what the empty bar already weighs — here is the honest reference, including the bars that trick people.
Barbell weight by type
| Bar type | Weight (kg) | Weight (lb) | Shaft Ø | Notes |
|---|---|---|---|---|
| Men’s Olympic barbell | 20 kg | 44 lb | 28 mm | The standard for squats, presses, deadlifts, and Olympic lifts. |
| Women’s Olympic barbell | 15 kg | 33 lb | 25 mm | Shorter and slightly thinner; same loading maths. |
| Technique / youth bar | 5–10 kg | 11–22 lb | 25–28 mm | Light aluminium or thin steel bars for learning form. |
| EZ / curl bar | 7–12 kg | 15–26 lb | 25–28 mm | Angled grip for curls and triceps work; weight varies most. |
| Standard 1-inch bar | 5–12 kg | 12–26 lb | 25–27 mm | Takes 1-inch hole plates, not Olympic 2-inch plates. |
| Trap / hex bar | 20–30 kg | 45–65 lb | 27–29 mm | Neutral-handle deadlifts and carries; frame weight varies. |
| Safety squat bar | 20–30 kg | 45–65 lb | 32–35 mm | Thick, cambered, pad-inclusive; often heavier than expected. |
| Deadlift bar | 20 kg | 44 lb | 27 mm | Whippier and longer than a stiff power bar. |
Bars vary between manufacturers. Competition bars are exact, but budget and gym bars drift a kilogram or two either way. The surest check: the weight is often stamped on the end cap, or weigh the bar on a bathroom scale and subtract a kilogram for good measure.
Why the bar weight changes your loading
Plate loading is always: (target weight − bar weight) ÷ 2 = weight per side. If you assume a 20 kg bar but train on a 15 kg technique bar, every lift is 5 kg lighter than you think — and the plates on the bar will not tell you, because the bar itself is the missing plate.
On a 20 kg bar, loading a 25 kg plate on each side gives 70 kg total, not 50 kg. That single mistake is why IronMath asks for your bar weight first and shows the full visual stack before you lift.
Which bar do you actually have?
Quick identification: if the sleeves are 50 mm (2 inches) across where plates slide on, it is an Olympic bar — usually 20 kg (men’s), 15 kg (women’s), or 10 kg (technique). If the whole bar is one thickness and plates slide over the entire end, it is a standard 1-inch bar, usually 5–12 kg. EZ and trap bars are the least standard — check the end cap or the product listing.
Dumbbells count too. Adjustable Olympic dumbbell handles typically weigh 2–5 kg (5–11 lb) each handle. If your dumbbell “feels heavier than it should,” the handle is why. The IronMath calculator has a dumbbell mode with an adjustable handle weight.
Keep reading
Plate loading chart (kg & lb) →
Weight plate buying guide →
One-rep-max calculator →