It is quite obvious that every online calculator is off because of individual differences, but math tends to be spot on everything and when it doesn't it's because we lack the needed data... With enough data a computer can simulate the entire universe at 100% accuracy... But we don't have enough data for that.
strengthlevel.com tells me that my one rep max pull up is with 46 kilograms of added weight or 101 pounds.
I tried it, and well..kinda failed the rep...failed the rep on 8 attempts that same day and I always got to almost chin to bar...almost chin to bar but not quite. Which counts as failed rep. Specially since I'm used to do repetitions where I touch my sternum bone to the bar.
Seems the calculator was just slightly wrong, but not by much. Does anyone know by how much exactly can one rep max calculators be off?