Plate Calculator

Stop counting plates. Enter your target weight and see exactly how to load the bar — supports any bar weight, collars, and both standard kg and lb inventories.

Loaded weight

315 lb

Exact match

Per side

3×45lb

6 plates total

Plates on each end

135 lb

Bar + collars = 45 lb

Plate	Per side	Total pairs
45 lb	3	3

How the math works

This calculator solves the per-side load greedily — take the heaviest plate that fits, repeat. The result is always the minimum number of plates for a given inventory and target.

Per-side target: (target − bar − 2×collar) / 2
Greedy: always take the heaviest plate that fits
Balanced: prefer paired smaller plates over a single odd plate
Standard lb plates: 45 / 35 / 25 / 10 / 5 / 2.5
Standard kg plates: 25 / 20 / 15 / 10 / 5 / 2.5 / 1.25
Olympic bar: 45 lb (20.4 kg) or 20 kg (44.1 lb)

Quick lookup table — lb

Total	Per side (45 lb bar)
95 lb	1×25
135 lb	1×45
185 lb	1×45 + 1×25
225 lb	2×45
275 lb	2×45 + 1×25
315 lb	3×45
405 lb	4×45
495 lb	5×45

Need a specific load? Use the calculator above — it supports any bar weight, collars, and custom plate inventories.

Use this as an API

Build with the Proload API

POST a target weight and get both greedy and balanced plate breakdowns back. Useful for coaching apps, log books, and Discord bots.

POST https://api.proload.online/v1/plates

API docs Get a key

Frequently asked questions

What plates do I need for 315 lb?

315 lb on a standard 45 lb Olympic bar is 3 × 45 lb plates per side — a classic "three plates a side" lift. With collars or a different bar weight the answer changes; this calculator handles all of that.

What plates do I need for 225 lb?

225 lb on a 45 lb bar is 2 × 45 lb plates per side ("two plates"). 135 lb is one plate per side. 405 lb is four plates per side.

Does this account for collar weight?

Yes — enter the per-side collar weight and the calculator subtracts it before solving. Standard competition lockjaw collars are 2.5 kg (about 5.5 lb) per side; commercial spring collars are usually under a pound.

Can I customize my gym's plate inventory?

The web tool uses standard commercial inventories. The API lets you pass a custom plate list (weight + count per pair) so you can model exactly what's on your rack — great for home gyms with limited plates.

Why does the result show a remainder?

Some target weights cannot be hit exactly with standard plates. For example, 96 lb on a 45 lb bar would need a 25.5 lb plate per side, which doesn't exist. The calculator gets you to the closest achievable weight under the target and reports the gap.

Plate Calculator

Quick lookup table — lb

Build with the Proload API

Frequently asked questions

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