About BarWeight

BarWeight is a set of free barbell calculators and reference data. Plate math, rep math, unit conversion, and straight answers about what the bar weighs. That is the whole product.

Why it exists

Every one of these calculations is trivial and everybody gets them wrong anyway, usually in the same three ways: forgetting the bar, assuming 45 lb and 20 kg are the same thing, and asking for a total that no plate set can build. Doing them on a phone between sets is faster than doing them in your head, and the tool does not get tired at rep eight.

How it stays honest

• Every formula is published and cited on the page where it is used.
• Bar and plate weights are labelled as nominal manufacturer sizes, because that is what they are. We have not weighed anything.
• The calculators ship with a test suite of hand-computed cases. If the arithmetic breaks, the build breaks.
• When a weight is not loadable, the tool says so instead of quietly rounding.
• No fabricated testing, no invented ratings, no made-up review counts.

The full detail is on the methodology page, including every citation and the exact algorithm behind the plate solver.

What this is not

It is not medical advice and it is not coaching. An estimated one-rep max is a programming input, not a number to chase. If you have any doubt about loading heavy, talk to someone who can actually watch you lift.