How plate math works
The total weight on a barbell is bar + (plates per side × 2). To load a target weight: subtract the bar, divide by two, and build that number per side starting with the heaviest plates. For 225 lb with a 45 lb bar: (225 − 45) ÷ 2 = 90 lb per side — two 45s. Simple at 225, less simple at 287.5 between heavy sets. That's what this calculator is for.
Common barbell loads (45 lb bar)
| Total weight | Per side | Gym shorthand |
|---|---|---|
| 95 lb | 25 | — |
| 135 lb | 45 | One plate |
| 185 lb | 45 + 25 | — |
| 225 lb | 45 × 2 | Two plates |
| 275 lb | 45 × 2 + 25 | — |
| 315 lb | 45 × 3 | Three plates |
| 405 lb | 45 × 4 | Four plates |
Pounds vs. kilograms
Most US gyms use pound plates (45 / 35 / 25 / 10 / 5 / 2.5), while competition and international gyms use kilogram plates (25 / 20 / 15 / 10 / 5 / 2.5 / 1.25) on a 20 kg bar. If you train in one and compete in the other, note that 1 kg ≈ 2.2 lb — a 100 kg squat is about 220 lb. The unit toggle above switches plate sets and bar weights automatically.
Loading the bar between sets
Working off percentages? Get your working weights from the one rep max calculatorfirst, then use this tool for each set's load. When warming up, a simple ramp works well: empty bar, ~50%, ~70%, ~85%, then your first working set — the calculator makes each jump a five-second plate change instead of mental math mid-workout.