function calculator() {
	var ounces_of_pull = document.getElementById("ounces_of_pull").value;
	var inches_wide = document.getElementById("inches_wide").value;
	var pieces = document.getElementById("pieces").value;

	if (ounces_of_pull > 0 && inches_wide > 0) {
		document.getElementById("inches_of_material").value = (ounces_of_pull / 8 * (1 / inches_wide)).toFixed(2);
		var inches_of_material = document.getElementById("inches_of_material").value;
	}else{
		document.getElementById("inches_of_material").value = "";
	}

	if (inches_of_material > 0 && pieces > 0) {
	document.getElementById("feet_of_material").value = Math.ceil(inches_of_material * pieces / 12);
	var feet_of_material = document.getElementById("feet_of_material").value;
	}else{
		document.getElementById("feet_of_material").value = "";
	}

	if (feet_of_material > 0) {
	document.getElementById("rolls_of_material").value = Math.ceil(feet_of_material / 100);
	var rolls_of_material = document.getElementById("rolls_of_material").value;
	}else{
		document.getElementById("rolls_of_material").value = "";
	}

}
window.onload = function(){calculator();};