In any case, it is a ridiculous calculator that I made over 15 years ago and greatly regret infecting the internet with. This thing is on so many sites now, both fitness and JavaScript related, that it can never be put back in the bottle. I wince to think of how many people have developed a complex about their physiques because of this nonsense. Please, do not take this calculator seriously. I uploaded it here primarily to include this message.
Professor Marc Levoy of Stanford, who headed the Digital Michelangelo Project, told me that David is "anatomically impossible."
But, maybe my fuzzy memory is wrong, maybe this isn't based on David. Still, I know of no reason why you should base your training on it! Ask yourself which is worse: aspiring to look like a statue with proportions deliberately skewed (to accentuate features meant to be viewed from afar); shaping your body to fit the unjustified and unsourced dimensions spat out at you by a calculator on the internet. It's a trick question: they're both dumb.
I invite and encourage the denouncing of this calculator wherever it is found.