Work out exactly which weight plates to load on each side of the bar to hit your target total weight — in kilograms or pounds.
Subtract the bar's own weight from your target total, then split what's left evenly between both sides of the bar. This calculator uses a simple greedy plate-selection method — always reaching for the biggest plate that still fits — to tell you exactly how many of each plate size to slide on per side, plus the exact total weight you'll actually end up lifting.
| Plate Size | Qty / side | Qty / bar (both sides) |
|---|
Assumes an unlimited standard Olympic plate set is available per side. Always confirm your gym actually stocks enough of each size.
| Component | Weight |
|---|
Loading a barbell is basic gym arithmetic, but it's easy to fumble under fatigue or when a gym's plates are labelled in a unit you're not used to. The calculator first works out how much weight actually needs to go on the bar (your target minus the bar's own weight), then splits that evenly across both sides, since plates must be loaded symmetrically for the bar to balance.
To fill each side, it uses a "greedy" selection method: starting with the largest plate in the set, it keeps using that size as many times as it will fit into the remaining weight, then moves to the next size down, and repeats until the remainder is too small for even the lightest plate. This mirrors exactly how an experienced lifter loads a bar by eye — biggest plates first, working down to the smallest.
The "bar weight" you enter should be the true weight of the empty barbell, since that's already included in your target total. Bars vary more than most lifters expect, so it's worth checking rather than assuming.
| Bar type | Typical weight | Common use |
|---|---|---|
| Men's Olympic bar | 20 kg (45 lb) | Standard bar for most compound lifts |
| Women's Olympic bar | 15 kg (35 lb) | Shorter, thinner shaft; often used in weightlifting |
| Technique / training bar | ~10 kg (≈15–22 lb) | Learning form, warm-ups, deload sessions |
| Powerlifting-specific bar | 20–25 kg (45–55 lb) | Stiffer shaft for squat, bench, deadlift |
Whatever bar you're using, always enter its actual weight rather than assuming 20 kg — a technique or specialty bar can throw your plate math off by several kilograms.
Gyms outside Australia, and some local gyms with imported equipment, use imperial (pound) plates instead of kilograms. The two systems use different plate sizes and are not interchangeable on the same bar — a 45 lb plate is not a round number in kilograms, and a 20 kg plate is not a round number in pounds. Pick the unit system that matches the plates actually sitting on the rack in front of you, and keep every plate on the bar in that same system.
This calculator assumes the standard Olympic plate increments below are available in unlimited quantity per side. Real-world plate inventory can be more limited — see the notes further down the page.
| System | Available plate sizes |
|---|---|
| Metric (kg) | 25, 20, 15, 10, 5, 2.5, 1.25 |
| Imperial (lb) | 45, 35, 25, 10, 5, 2.5 |
The "target total weight" you enter should be the full weight you want on the bar, including the bar itself — not just the plates. A common beginner mistake is entering the plate weight only, or forgetting the bar entirely, which throws the whole calculation off by 15–25 kg depending on the bar. If in doubt, check the bar's stamped weight or ask gym staff, then enter your true target total.
Many competition and commercial gym plates follow a rough colour convention, though it varies by brand and is not universal — always check the number stamped on the plate rather than relying on colour alone.
| Colour | Metric | Imperial (approx.) |
|---|---|---|
| Red | 25 kg | 55 lb |
| Blue | 20 kg | 45 lb |
| Yellow | 15 kg | 35 lb |
| Green | 10 kg | 25 lb |
| White | 5 kg | 10 lb |
| Black / mixed | 2.5 kg and below | 5 lb and below |
How much does a barbell weigh?
A standard men's Olympic barbell weighs 20 kg (45 lb). Women's Olympic bars are lighter at 15 kg (35 lb), and many gyms also stock shorter technique or training bars weighing anywhere from about 10 kg to 15 kg (roughly 15–33 lb). Always check the bar itself, or ask gym staff, before assuming it's a standard 20 kg bar.
What if I can't hit my exact target weight?
Plates only come in fixed increments, so not every target weight is achievable with a standard set. When your target falls between two loadable totals, this calculator shows the closest weight you can actually build and tells you how far it is from your original target. Using smaller micro-plates (0.5–1.25 kg or 1–2.5 lb) closes most of that gap if your gym has them.
Do all gyms have the same plate sizes?
No. Most commercial gyms stock a standard Olympic set, but the exact range and quantity of each plate size varies — some gyms run short of 1.25 kg or 2.5 lb plates, and home setups often have fewer plates overall. This calculator assumes an unlimited standard set is available; always check what your gym actually has before relying on the exact combination shown.
Do I need to load both sides of the bar the same?
Yes, always. Loading a barbell unevenly shifts its balance point, making the bar want to tip or rotate under load, which is a common cause of dropped bars and injury. This calculator always splits the weight-to-load evenly across both sides for exactly this reason.
What are collars for and do I need them?
Collars (clips or clamps) lock the plates onto the sleeve of the bar so they can't slide off during a lift. They're essential any time you're doing dynamic or heavy movements — squats, deadlifts, cleans, presses — since plates can shift or come loose without them. Always use collars unless a specific technique explicitly calls for going without.
Can I use this calculator for lb (pound) plates?
Yes. Switch the unit selector to Imperial (lb) and the calculator uses a standard imperial plate set (45, 35, 25, 10, 5 and 2.5 lb) along with an imperial bar weight. Keep your plates and bar in the same unit system throughout — metric and imperial plates aren't interchangeable on the same bar.
Why does the calculator sometimes show a total slightly different from what I typed?
That happens when your target weight isn't achievable with the available plate increments. Rather than showing a loading combination that doesn't actually add up, the calculator finds the closest weight your plates can genuinely build and displays that real total alongside your original target so you know exactly what you're lifting.