[5e OGL] Change Attribute Mod calculations?

How are the attribute mods calculated on the 5e OGL sheet? I've looked at the HTML and I can't find where there's a formula that translates a 16 Strength into a mod of 3. I am interested in changing the formula for a homebrew 5e game, but I can't figure out how to do so. The formula I'd like to use is Mod=(BaseAttr - 10), not the current Mod=(BaseAttr - 10)/2. So a score of 14 would be +4 under my formula, not a +2.

That would require grabbing the character sheet code from the github and modify the following code and using the custom sheet option in the game settings. var update_mod = function (attr) { getAttrs([attr], function(v) { var attr_abr = attr.substring(0,3); var finalattr = v[attr] && isNaN(v[attr]) === false ? Math.floor((parseInt(v[attr], 10) - 10) / 2) : 0; var update = {}; update[attr + "_mod"] = finalattr; update["npc_" + attr_abr + "_negative"] = v[attr] && !isNaN(v[attr]) && parseInt(v[attr], 10) < 10 ? 1 : 0; setAttrs(update); }); };

Awesome, thank you. I got as far as adding it as a custom sheet and was looking at the HTML and couldn't figure out where I should be looking for the calculations. I know rudimentary HTML and even less CSS. :) Is that  *Workers* section javascript? I'm not familiar with that code.

Yes, this is in the sheetworkers (javascript) portion of the code.

I found the Roll20 Wiki about Sheet Worker Scripts. Should be interesting. Thanks again!