Plate Calculator
Enter a target weight and see which plates to load on each side of the bar.
Loading a Barbell - Plate Maths Made Simple
Every barbell lifter eventually learns to do plate arithmetic in their head - but it is faster and error-free to let a calculator do it. The logic is straightforward: subtract the bar weight from your target, divide by two to get the load per side, then fill that number using the largest plates available and work down to the smallest fractional plates needed.
In kg gyms, the standard set of plates is 25, 20, 15, 10, 5, 2.5, and 1.25 kg. In lb gyms, the common sizes are 45, 35, 25, 10, 5, and 2.5 lb. Men's Olympic barbells weigh 20 kg (44 lb); women's bars weigh 15 kg (33 lb). If you are lifting on an EZ-bar or a specialty bar, enter its actual weight in the bar weight field for accurate results.
A useful habit is to memorise a few common combinations. For example, 100 kg on a 20 kg bar means 40 kg per side - two 20 kg plates each side. 140 kg is a 20 kg bar + 20 + 20 + 10 per side. Building this mental library makes loading at busy gyms significantly faster and reduces the chance of a mismatch between what you intend to lift and what is actually on the bar.
Frequently Asked Questions
How do I use a plate calculator?
Enter your target barbell weight and the weight of your bar (typically 20 kg / 45 lb). The calculator subtracts the bar weight, divides the remainder in half, and tells you exactly which plates to load on each side.
What is a standard bar weight?
A standard Olympic barbell weighs 20 kg (44 lb) for men and 15 kg (33 lb) for women. Most commercial gym bars are 20 kg. If you are unsure, ask your gym or weigh the bar - the weight is often stamped on the sleeve.
What plate sizes are available in kg?
Standard Olympic plate sizes in kg are: 25, 20, 15, 10, 5, 2.5, and 1.25. Most gyms stock 20 kg and 10 kg plates in large quantities, with smaller fractional plates for fine adjustments.
What plate sizes are available in lb?
Common plate sizes in lb are: 45, 35, 25, 10, 5, and 2.5. The 45 lb plate is the most common and represents the backbone of most loading combinations.
Why does my target weight show no plates?
If your target weight is equal to or less than the bar weight, no plates are needed - just the bar itself. Make sure your target weight is greater than the bar weight.
Can I load a bar asymmetrically?
You should never load a bar asymmetrically in normal training - uneven loading stresses the bar and creates a real injury risk during heavy lifts. Always load the same plates on both sides.