function calc(){
var L = 1;
var AFR = 14.7;
var HC= document.getElementById('HC').value*1;
var CO= document.getElementById('CO').value*1;
var COtoo= document.getElementById('COtoo').value*1;
var Otoo= document.getElementById('Otoo').value*1;
var NOX= document.getElementById('NOX').value*1;
var Hcv=1.98;
var Ocv=.017;


var Lambda=(COtoo+(CO/2)+Otoo+(NOX/10000)/2+((Hcv/4)*(3.5/(3.5+(CO/COtoo)))-Ocv/2)*(COtoo+CO))/((1+Hcv/4-Ocv/2)*(COtoo+CO+6*(HC/10000)));

if(Lambda >=1){
Lambda=Math.round(Lambda*1000)/1000;
}
else
{
Lambda=Math.round(Lambda*10000)/10000;
}

document.getElementById('LambdaC').value=Lambda;

document.getElementById('AFR').value= Math.round(AFR*Lambda*100)/100;

}