1 Rep Max Calculator - For those who don't do 1 rep maxes. `

It's a decent guide, but 1rm calculations can be difficult to estimate.

I saw an interesting study that women are far better at reps at 90% of a 1RM than men are. Essentially women could hit 5-6 reps in a set at 90% where men were in the 2-3 range.

Your link seems to have a PW requirement, so my only other caveat would be that above 5 reps is pretty impossible to reliably translate to a 1rm.

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Could be that men push the envelope more going for a 1RM than women.

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I'd have a different hypothesis.

First, women are generally smaller, i.e., a shorter bar path. The shorter bar path minimizes fatigue over multiple reps.

Also, men generally have a higher % of fast twitch muscle and women have a higher % of slow twitch. That means peak power output is generally higher for men, but women will do well when endurance is a component.

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my wife always lasts longer than i do

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You should shorten your bar path.