Plate calculator (lb)
Plate calculator, in pounds.
Type any target in lb. LiftLoadout works out the exact plates per side for a 45 lb, 35 lb, or any other bar — using only the plates you actually own.
Adjust plate inventory
Use − / + to match what you own. Two plates make one usable pair. Results update instantly.
How pound plate math works.
The recipe every US lifter runs daily: subtract the bar from your target, divide what's left by two, and build that per-side weight from your plates, biggest first. A 45 lb bar with a 225 lb target leaves 180 lb — 90 lb per side, which is two 45s. It gets tedious with odd totals, 35 lb bars, collar weight, and home-gym inventories missing the plates the math wants.
The calculator above handles all of it: pick your bar preset, toggle collars, set the plates you actually own, and get a per-side breakdown instantly. Switch to "Add weight" mode between sets and it tells you exactly what to slide on next, accounting for what's already loaded. Prefer kilos? The kilo plate calculator runs the same engine in metric.
Worked examples
135 lb on a 45 lb bar
(135 − 45) ÷ 2 = 45 lb per side → 1× 45. One plate — where every lifter starts.
185 lb on a 45 lb bar
(185 − 45) ÷ 2 = 70 lb per side → 1× 45 + 1× 25.
225 lb on a 45 lb bar
(225 − 45) ÷ 2 = 90 lb per side → 2× 45. The classic two-plate bench.
315 lb on a 45 lb bar
(315 − 45) ÷ 2 = 135 lb per side → 3× 45. Three plates.
When the math doesn't cooperate
Limited inventory. Home gyms rarely have eight 45s. Set your real plate counts under "Adjust plate inventory" and the calculator searches only what you own. If the exact target is impossible, it returns the closest achievable load and states the difference plainly.
Target below the bar. If your target is lighter than the bar plus collars, there's nothing to load — the calculator tells you the minimum total instead of showing a nonsense negative.
Common questions.
What plates do I need for 225 lb on a 45 lb bar?
Subtract the 45 lb bar from 225 to get 180, then split per side: 90 lb. That's two 45 lb plates per side. The calculator above does this instantly for any target.
What if my bar weighs 35 lb instead of 45 lb?
Tap the 35 lb preset under "Bar weight · one tap". Presets cover 45, 35, 20, and 15 lb bars, and the per-side math updates instantly — your target stays in pounds.
Should I count collars in the total?
Most gym spring collars weigh almost nothing, but competition collars weigh 5.5 lb each. Toggle collars on above and LiftLoadout adds 2.5 lb per collar to the total automatically, so your loaded total stays honest.
How do I add weight between sets?
Switch to "Add weight" mode, enter your current loaded total and your next target. The calculator shows only the plates to add per side, accounting for what's already on the bar.