Guide
How to Load a Barbell
Quick answer
To load a barbell, subtract the bar from the target, divide what remains by two, and build that number on each side. A 100 kg target on a 20 kg bar is 80 kg of plates, 40 kg per side.
Largest plates go on first, closest to the sleeve collar of the bar. Collars go on last if you need them. The plate calculator does the pairing and draws the stack. It will not invent a plate you said you do not own.
Estimates only. Testing a true max carries risk; use a spotter or safety arms. Not medical advice.
Plate calculatorTarget, bar, and the plates on each side.Open →On this page
- What is the plate math?
- Which bar weight should you enter?
- What order do the plates go on?
- How do you change loads quickly?
- Key takeaways
- FAQ
What is the plate math?
Kilograms, the usual commercial set: 25, 20, 15, 10, 5, 2.5, 1.25. Pounds: 45, 35, 25, 10, 5, 2.5. A 20 kg bar with a 25 and a 15 on each side is 20 + 2×(25+15) = 100 kg. A 45 lb bar with a 45 and a 25 on each side is 45 + 2×(45+25) = 185 lb.
If the target cannot be made from the plates you checked, the calculator loads the closest weight at or under the target and says so. Do not 'round up in your head' and then wonder why the set felt heavy.
Which bar weight should you enter?
Weigh it if you can. A standard men's powerlifting bar is 20 kg. A women's bar is often 15 kg. Many gym bars are unmarked and are not 20 kg even when everyone treats them that way. A short technique bar may be 10 or 15 kg.
Pound bars are often 45 lb for a men's Olympic bar and 35 lb for a women's bar. Specialty bars (safety squat, axle, trap bar) are heavier. A trap-bar deadlift loaded 'the same as the straight bar' is not the same load if the bar itself differs.
What order do the plates go on?
Heaviest at the inside. Pairs only. If you put 25 kg on one side and 20 plus 5 on the other, the bar is even in weight and awkward in practice. Match the pairs.
Look at both sides before you unrack. The missed plate is the most common reason a warm-up feels 'surprisingly hard.' The second most common is forgetting you already had a 2.5 on the bar from last set.
How do you change loads quickly?
Leave the big plates on and swap the outer ones. Jumping from 100 kg to 140 kg means another 20 kg per side, which is a 20, or a 10 and two 5s, depending on the set. Plan the jump before you are breathing hard.
Percent programs create ugly targets. 72.5% of an estimated max is rarely a plate you own. Round to the nearest available load and write down what you actually lifted, not what the spreadsheet said.
The loads worth making are the ones in the warm-up and in the percentage chart. On a test day the same math shows up in smaller jumps.
Key takeaways
- Plates are counted per side, then the bar is added.
- Stay in one unit for the whole session.
- The biggest plate that fits, twice, then the next.
- If the math is not exact, load the closest weight under the target.
FAQ
Do collars count toward the weight?
Usually no, unless you are in a federation that says they do. Do not add a kilo for spring clips.
What if I only have 20 kg plates?
Uncheck the others in the plate calculator. The stack will use what you allowed, or it will stop short of the target.
Is a 15 kg plate real?
Yes, in many kilogram gyms. Pound gyms usually do not have a matching plate. Do not assume the set.
Why does my total look light?
The bar was probably lighter than you entered, or one side is missing a plate. Weigh the bar once.
Can I load a dumbbell this way?
No. This math is for a barbell with two sides. A dumbbell's number is written on the dumbbell.