If you’ve ever loaded plates onto a barbell and wondered whether the bar itself counts toward your total, you’re not alone. It’s one of the most common questions in any UK gym, and the answer matters more than most lifters realise. Get it wrong and your training log is off by up to 20 kg on every set.

Standard Bench Press Bar Weights

Most commercial gyms in the UK stock Olympic bars for the bench press. Here’s how the common types compare:

• Men’s Olympic bar: 20 kg (44 lb), 2.2 m long, 28 mm shaft, 50 mm sleeves
• Women’s Olympic bar: 15 kg (33 lb), 2.01 m long, 25 mm shaft
• Standard 1-inch bar: roughly 7–9 kg, 1.8 m long, with spin-lock collars
• EZ curl bar: around 8–10 kg, shorter with angled grips
• Trap (hex) bar: typically 20–25 kg depending on the brand
• Swiss / football bar: usually around 20 kg with neutral grips

The 20 kg Olympic bar is the default in most UK gyms, from high-street chains to independent strength clubs. If you’re unsure, assume 20 kg — but verify, as we’ll explain below.

How to Tell Which Bar Your Gym Has

1. Check the end caps

Many quality bars (Eleiko, Rogue, Again Faster) stamp the weight on the end cap. Give it a look before you lift — it takes two seconds.

2. Look at the knurling marks

Olympic bars have knurling marks at standard positions: 81 cm apart for powerlifting bars (with a centre knurl) and 91 cm apart for Olympic weightlifting bars (usually no centre knurl). A bar with no standard markings is more likely a cheaper generic bar with a non-standard weight.

3. Ask the staff

Gym staff usually know their equipment. It’s a perfectly normal question — ask “how much does the bench bar weigh?” and note the answer in your training log.

4. Weigh it yourself

Stand on a set of scales holding the bar, then subtract your body weight. It’s rough, but it settles the question for good. For more on bar types, see our guide on how heavy a barbell is across different types.

Does the Bar Count Towards Your Total Weight?

Yes — always. When someone says they bench 100 kg, that means 100 kg total including the 20 kg bar (so 40 kg of plates per side). Competition lifts are always counted this way, and your training log should match. If you only count the plates, you’re overstating your lift by the weight of the bar.

The one exception is collars: competition collars weigh 2.5 kg each and are counted in official totals, but in everyday training most lifters don’t add collar weight to their logged numbers. Just be consistent.

Why Bar Weight Actually Matters

Progressive overload depends on it

Adding 2.5 kg per side each week is a classic progression scheme — but if you don’t know the bar weighs 20 kg, your percentages and warm-up jumps are all wrong. Accurate numbers mean smarter programming.

Plate maths gets easier

Knowing the bar is 20 kg makes loading simple: want 60 kg? That’s 20 kg per side. Want 100 kg? 40 kg per side. UK plates come in 25, 20, 15, 10, 5, 2.5 and 1.25 kg, so the maths works neatly once the bar weight is fixed in your head.

Comparing lifts fairly

If you train at two gyms with different bars, your numbers aren’t directly comparable unless you know both bar weights. A “100 kg bench” on a 20 kg bar is really 97.5 kg of effort if the other gym’s bar is 17.5 kg.

Common Mistakes to Avoid

• Assuming every bar is 20 kg: hotel gyms and budget chains sometimes use lighter generic bars.
• Forgetting the bar when a spotter asks: “how much is on the bar?” means the total, bar included.
• Mixing kg and lb plates: UK gyms occasionally have both; 45 lb plates are roughly 20.4 kg, close enough to cause confusion.
• Ignoring speciality bars: a safety squat bar or axle bar can weigh 22–25 kg — never assume.

Olympic Bar Specifications in Detail

Not all 20 kg bars are created equal. The specification sheet of a quality barbell tells you a lot about how it will feel and last:

Knurling

Knurling is the crosshatched pattern cut into the shaft for grip. Power bars have aggressive, sharp knurling (often with a centre knurl that grips your back during squats); Olympic weightlifting bars have milder knurling and usually no centre knurl, so the bar can rotate cleanly in your hands during cleans and snatches. Multipurpose bars sit in between. If your hands are being shredded, the knurling is probably too aggressive for high-rep work.

Whip and tensile strength

Whip is how much the bar flexes under load. Deadlift bars are whippy (so the plates break the floor progressively); squat bars are stiff (so the weight doesn’t oscillate on your back). Tensile strength, measured in PSI, indicates how much stress the steel takes before deforming — 190,000+ PSI is excellent, 150,000 PSI is fine for general use. Higher PSI usually means a thinner, livelier bar that still holds its shape.

Sleeve rotation: bearings vs bushings

Olympic sleeves rotate so the plates don’t torque your wrists during explosive lifts. Bearing bars spin fast and freely (preferred for Olympic lifting); bushing bars spin slower and are more durable (preferred for powerlifting). For bench press it barely matters, but it affects the price.

Finish

Chrome is slick and corrosion-resistant; black zinc is grippier but wears faster; cerakote adds colour with decent durability; stainless steel offers the best feel and rust resistance at a premium. In a humid UK garage gym, stainless or chrome is worth the extra money.

How Much Do Collars and Clips Add?

Collars are the forgotten weight. Standard spring collars add about 0.25 kg per pair — negligible. Lock-jaw style collars are similar. But competition collars weigh 2.5 kg each, adding a full 5 kg to the bar. In competition, that 5 kg counts toward your total; in training, most lifters ignore it. Whatever you choose, be consistent — and if you train for competition, practise with competition collars occasionally so the extra 5 kg doesn’t surprise you on the platform.

FAQs

How much does a standard gym barbell weigh in kg?

A standard Olympic barbell weighs 20 kg. A women’s Olympic barbell weighs 15 kg. Basic non-Olympic bars typically weigh 7–10 kg.

Do you count the bar when bench pressing?

Yes. The bar’s weight is always included in the total. A 60 kg bench press means the bar plus plates add up to 60 kg.

How much does an EZ bar weigh?

Most EZ curl bars weigh between 8 and 10 kg, though Olympic-sized EZ bars can be heavier. Check the manufacturer’s stamp on the end cap.

Why do some bars feel heavier than others?

Shaft thickness, knurling sharpness and whip (flex) all change how a bar feels. A 28 mm power bar feels more rigid than a 28.5 mm multipurpose bar, even at the same weight. For more on building strength safely, read our guide on how to improve deadlift.

What does the British Weight Lifting guidance say about bars?

British Weight Lifting, the UK’s governing body, specifies 20 kg men’s and 15 kg women’s bars for sanctioned competition — the same standard used in gyms across the country.

How much does a Smith machine bar weigh?

Smith machine bars are counterbalanced, so they typically feel like 5-10 kg regardless of their actual weight. Because the machine guides the bar path, Smith machine bench numbers are not directly comparable to free-weight numbers.

Should beginners use a full 20 kg bar?

Not necessarily. Many gyms stock 15 kg technique bars or even 10 kg training bars for beginners learning the movement. There is no shame in starting light – good form with a lighter bar beats bad form with 20 kg every time.