[Solved] How to subtract two inputs with each another

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<input id="total" type="text">
<input id="v1" type="text">
<input id="v2" type="text">
<button type="button" onclick="update()">Update</button>
<script>
function update() {
  var total = parseInt(document.getElementById("total").value, 10);
  var value1 = parseInt(document.getElementById("v1").value, 10);
  var value2 = parseInt(document.getElementById("v2").value, 10);
  document.getElementById("total").value = total - (value1 + value2);
}
</script>

Working example: https://jsfiddle.net/md9ebo00/5/

I would not suggest using onchange="update" as an attribute for the two value fields, as when you type in the first value, you will wipe out your original total before you’ve typed in the second value.

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solved How to subtract two inputs with each another