Why are plates shown per side?

Olympic barbell loading is always symmetric — you load the same plates on each side. The calculator shows what to put on each side, so total plate weight is doubled plus the bar when computing total weight.

What if I can't hit my exact target weight?

The calculator finds the nearest achievable weight below your target using available plates. This is common for specific weights like 97.5 kg when you only have 2.5 kg as your smallest plate. Use the nearest achievable consistently and add a micro-load if you have fractional plates.

What bar should I use?

Standard Olympic bar: 20 kg / 45 lb. Women's Olympic bar: 15 kg / 35 lb. EZ curl bar: typically 10 kg / 25 lb. Check the stamp on the end of your bar if unsure — most commercial gym bars are marked.

Are fractional plates supported?

Yes. You can select available plates and the calculator includes smaller increments like 1.25 kg or 2.5 lb. If your gym has fractional plates (0.5 kg), add them manually via custom input.

Yes. All calculations are client-side. No data leaves your browser.

Methodology: Plate Loading Calculator

Scope

Calculates which plates to load on each side of a barbell for a target weight in kg or lbs.

Formula

per_side = (target - bar) / 2. Then greedy-assign plates largest-first from the selected plate set.

Coefficients

Parameter	Value	Note
Standard kg bar	`20 kg`
Standard lb bar	`45 lb`
Women's kg bar	`15 kg`
Typical kg plates	`25, 20, 15, 10, 5, 2.5, 1.25, 0.5, 0.25`
Typical lb plates	`45, 35, 25, 10, 5, 2.5`

Data sources

IPF Technical Rules Book — barbell and plate specifications. — Federation rulebook section on equipment: bar weights (20 kg men's, 15 kg women's, 10 kg deadlift) and plate weights/colors.
USA Powerlifting (USAPL) — Lifter Handbook and Equipment Standards. — U.S. federation rules for plate denominations and competition bar specifications.

Assumptions

Plates available are correctly selected in the UI.

Approximation range

Exact arithmetic. Resolution is limited to smallest available plate (usually 0.25 kg / 0.5 lb).

Limitations

Does not account for collar weight (typical competition collars add 5 kg total).

Reproducibility

Target 140 kg, 20 kg bar. Per side = 60 kg. Greedy = 25 + 25 + 10.

Change log

2026-04-24: methodology page first published.

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Worked example

Computed by the same engine bundle served at /engines/plate-loading-calculator.js. Re-runnable: the values below are the literal output of compute(engineInput).

Input

tool: plate_loading_calculator
target_weight: 100
bar_weight: 20

Output

targetWeight: 100
barWeight: 20
achievable: true
loadedWeight: 100
platesPerSide: [{"plate":25,"count":1},{"plate":15,"count":1}]
nearestWeight: null
nearestPlatesPerSide: null

FAQ

Why are plates shown per side?: Olympic barbell loading is always symmetric — you load the same plates on each side. The calculator shows what to put on each side, so total plate weight is doubled plus the bar when computing total weight.
What if I can't hit my exact target weight?: The calculator finds the nearest achievable weight below your target using available plates. This is common for specific weights like 97.5 kg when you only have 2.5 kg as your smallest plate. Use the nearest achievable consistently and add a micro-load if you have fractional plates.
What bar should I use?: Standard Olympic bar: 20 kg / 45 lb. Women's Olympic bar: 15 kg / 35 lb. EZ curl bar: typically 10 kg / 25 lb. Check the stamp on the end of your bar if unsure — most commercial gym bars are marked.
Are fractional plates supported?: Yes. You can select available plates and the calculator includes smaller increments like 1.25 kg or 2.5 lb. If your gym has fractional plates (0.5 kg), add them manually via custom input.
Is this tool free?: Yes. All calculations are client-side. No data leaves your browser.