Barbell Plate Calculator

Loading a barbell looks simple until you're standing in front of the rack doing mental math. The trick is always the same: subtract the bar's weight, split what's left in half, and load the largest plates first onto each side. This calculator does that arithmetic for you and tells you exactly which plates to slide on per side to hit your target — and flags the targets that can't be loaded exactly.

The Three-Step Method

1. Subtract the bar weight. Your target total includes the bar. A standard men's Olympic bar is 20 kg (45 lb); the women's bar is 15 kg (33 lb). Subtract it first.
2. Divide by two. A barbell is loaded symmetrically, so whatever's left after the bar gets split evenly between the two sleeves. This is the weight per side.
3. Load largest plates first. Work down from the heaviest plate that fits, the way you'd make change with coins. This uses the fewest plates and keeps the load stable and tight to the collar.

Olympic Bar Weights

• Men's Olympic bar: 20 kg (45 lb) — the standard in most gyms.
• Women's Olympic bar: 15 kg (33 lb) — shorter shaft, thinner grip (25 mm vs 28 mm).
• Technique / training bars: 5–10 kg, used for learning movement patterns.

Always confirm which bar you're using before loading — getting the bar weight wrong throws off every plate calculation.

Worked Example: 100 kg on a 20 kg Bar

1. Subtract the bar: 100 − 20 = 80 kg of plates.
2. Divide by two: 80 / 2 = 40 kg per side.
3. Load largest first: 25 + 10 + 2.5 + 2.5 = 40 kg on each sleeve.

So each side gets one 25, one 10, and two 2.5 plates. Mirror it on both ends and you're at exactly 100 kg.

Standard Plate Sets

Kilogram plates

A full metric set: 25, 20, 15, 10, 5, 2.5, and 1.25 kg. Many gyms also stock small change plates of 0.5 and 0.25 kg for micro-loading.

Pound plates

A full imperial set: 45, 35, 25, 10, 5, and 2.5 lb. Note there is no 20 lb plate in the standard set — the jump goes 25 to 10.

Standard Plate Colors

Competition (IWF/IPF) kilogram plates follow a color code, which makes it easy to read a loaded bar at a glance:

• Red — 25 kg
• Blue — 20 kg
• Yellow — 15 kg
• Green — 10 kg
• (White — 5 kg; smaller change plates follow their own scheme)

Why Some Targets Can't Be Loaded Exactly

Plates come in fixed denominations, so not every number is reachable. The smallest change you can make on a bar is twice the smallest plate (one per side). With a smallest plate of 1.25 kg, the bar can only move in 2.5 kg increments — so a target of 101 kg on a 20 kg bar can't be hit exactly; you'd load to 100 kg or 102.5 kg. If your gym only has plates down to 2.5 kg, increments jump to 5 kg. When a target isn't loadable, the calculator rounds to the nearest achievable weight and shows you the difference.

Quick Reference: Common Totals on a 20 kg Bar

Per-side loading using a standard kg plate set.

Note: This loading guide is for informational use. Always load plates evenly on both sides, secure them with collars, and lift within your ability. Consult a qualified coach or healthcare professional before attempting heavy loads.