Plate Calculator
Figure out which plates to load on each side of the barbell for your target weight. Save your plate inventory locally.
Available plates
Enter how many plates you have of each size (total plates, not pairs). We’ll use as many pairs as possible.
One side of the bar
—
Barbell Loading Basics
Understanding standard barbell and plate specifications lets you load correctly and safely, and helps you navigate gyms where equipment labeling is inconsistent.
Barbell weights
A standard Olympic barbell is 20 kg (44.1 lb). Most US commercial gyms label these as 45 lb — close, but not exact. Women's Olympic barbells are 15 kg (33 lb) and are shorter and narrower in diameter. Powerlifting-specific bars (stiff bars) typically run 20–25 kg depending on the manufacturer. Always verify the bar weight before calculating, especially when working near your limits where a few pounds matters.
Standard plate sizes
In imperial gyms: 45 lb, 35 lb, 25 lb, 10 lb, 5 lb, and 2.5 lb are the standard denominations. In metric gyms: 25 kg, 20 kg, 15 kg, 10 kg, 5 kg, 2.5 kg, and 1.25 kg. Competition plate colors follow an international standard — red (25 kg), blue (20 kg), yellow (15 kg), green (10 kg), white (5 kg), black (2.5 kg), chrome (1.25 kg) — though commercial gym plates often use different coloring.
Load symmetrically; use collars
Always load the same plates on both sides of the bar. An asymmetric load creates torsion in the barbell and can destabilize you mid-lift — particularly dangerous during squats and overhead work. Use collars on any loaded bar. Each collar weighs approximately 2.5 lb / 1.1 kg; include them in your total if you're hitting precise targets for competition or testing.
Loading strategy
Work from largest to smallest plates. Load the heaviest plates first — they sit closest to the sleeve collar and bear the most load stress. This also makes it easier to read the bar at a glance: the outermost plates tell you the base of what's loaded, and you add up from there.
Building a home gym? Read How to Build a Home Gym on a Budget for plate buying strategies, equipment priorities, and used sourcing tips. For the training principles that drive your programming, see Understanding Progressive Overload.