Strength
Plate Loading Calculator
Calculate which weight plates to load on each side of a barbell to hit your target weight in kg or lbs.
Result
Plate contribution per side
Symmetric load: double each side and add the bar for the total.
How to use it
- Pick Metric for kilogram plates or US for pound plates, enter your target weight, then select your bar. Men's bars are 20 kg / 45 lb, women's bars 15 kg / 35 lb. Check the marking on your bar if unsure.
- Edit the plate list to match what your gym has on the rack (comma-separated). The calculator finds the combination that hits the target exactly with the fewest plates, favouring the larger plates.
- If the exact weight isn't achievable, the heaviest load below your target is shown, with the next load up beside it. This is common for odd targets when only standard plate sizes are available.
- Plates shown are per side — load each side symmetrically. Starting with the largest plates inside (closest to the collar) improves balance and bar spin.
- For progressive overload tracking: if you can't hit your exact target with available plates, use the nearest achievable weight consistently until you are ready to jump to the next plate increment.
Questions people usually ask
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 shows the heaviest achievable weight below your target and the next achievable weight above it. This is common for weights like 98.75 kg when your smallest plate is 2.5 kg (the smallest jump is then 5 kg). 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. The default sets include 1.25 kg and 2.5 lb plates. If your gym has fractional plates (0.5 kg or 1.25 lb), add them to the plate list.
Is this tool free?
Yes. All calculations are client-side. No data leaves your browser.
The formula, worked through
- Formula Plate Loading Formula
Plate-loading math: greedy descending allocation of plates per side. Olympic 20kg bar (45lb US), standard plate set: 25/20/15/10/5/2.5/1.25 kg per side.
- Formula Wendler 5/3/1 Formula
Wendler 5/3/1: training max = 90% true 1RM. 4-week cycle: 5/5/5+, 3/3/3+, 5/3/1+, deload. Add 5 lb upper / 10 lb lower per cycle. Jim Wendler Beyond 5/3/1.
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By goal
Use it from code
The same calculation as a JavaScript module you can import. It runs where you import it, with no request, key or rate limit.
import { compute } from "https://aifithub.io/engines/plate-loading-calculator.js";Input and output contract, TypeScript types and the guide for agents.