var totalEnteredCount = 0;

function totalEntered(field){

if(field.value !== '')

{

    totalEnteredCount++;

}

alert(totalEnteredCount);

if(totalEnteredCount == 3)

{

    var IV = document.getElementById("IVUnit").value;

    var FV = document.getElementById("FVUnit").value;

    var Distance = document.getElementById("DUnit").value;

    var Acceleration = document.getElementById("AUnit").value;

    var Time = document.getElementById("TUnit").value;

}

}