function cnvrta() {
  document.getElementById("theABox").value=document.getElementById("theBox").value*2.20462262;
}

function cnvrtb() {
  document.getElementById("theBBox").value=document.getElementById("theBox").value*3.2808399;
}

function cnvrtc() {
  document.getElementById("theCBox").value=document.getElementById("theBox").value*0.393700787;
}

function cnvrtd() {
  document.getElementById("theDBox").value=document.getElementById("theBox").value*9/5 + 32;
}
function cnvrte() {
  document.getElementById("theEBox").value=document.getElementById("theBox").value/2.20462262;
}

function cnvrtf() {
  document.getElementById("theFBox").value=document.getElementById("theBox").value/3.2808399;
}

function cnvrtg() {
  document.getElementById("theGBox").value=document.getElementById("theBox").value/0.393700787;
}

function cnvrth() {
  document.getElementById("theHBox").value=document.getElementById("theBox").value-32*5/9;
}
function fahrenheitToCelsius(t) { return 100/(212-32) * (t - 32); }