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    <p>You are trying it getElementsByName() should be document.getElementsByName() like this:</p> <pre><code>var volts = document.getElementsByName("voltDrop_volts")[0].value; var acdc = document.getElementsByName("voltDrop_acdc")[0].value; var amps = document.getElementsByName("voltDrop_amps")[0].value; var length = document.getElementsByName("voltDrop_ft")[0].value; var awg = document.getElementsByName("voltDrop_awg")[0].value; </code></pre> <p>Tested:</p> <pre><code>&lt;body&gt; &lt;h1&gt;Voltage Drop Calculator Tool&lt;/h1&gt; &lt;form id=form1&gt; &lt;div class="calculator-wrapper" id="voltageDropCalc" style="margin: 10px 0 20px 20px; padding: 15px;"&gt;&lt;!-- BEGIN Calc wrapper --&gt; &lt;p&gt;1. Initial Voltage&lt;/p&gt; &lt;select name="voltDrop_volts" size="1" style="padding: 3px;"&gt; &lt;option value="0"&gt;Choose...&lt;/option&gt; &lt;option value="12"&gt;12 Volt&lt;/option&gt; &lt;option value="24"&gt;24 Volt&lt;/option&gt; &lt;/select&gt; &lt;p&gt;2. AC / DC&lt;/p&gt; &lt;select class="sized" name="voltDrop_acdc" size="1" style="padding: 3px;"&gt; &lt;option selected="selected" value="dc"&gt;DC&lt;/option&gt; &lt;option value="ac"&gt;AC&lt;/option&gt; &lt;/select&gt; &lt;p class="field-label field-label-right"&gt;3. Current (Amps)&lt;/p&gt; &lt;input align="bottom" class="sized" name="voltDrop_amps" size="15" style="padding: 3px;" type="text" /&gt; &lt;p class="field-label field-label-right"&gt;4. Cable Length (ft)&lt;/p&gt; &lt;input align="bottom" class="sized" name="voltDrop_ft" size="15" style="padding: 3px;" type="text" /&gt; &lt;p class="field-label field-label-right"&gt;5. Cable Gauge (AWG)&lt;/p&gt; &lt;input align="bottom" class="sized" name="voltDrop_awg" size="15" style="padding: 3px;" type="text" /&gt; &lt;p&gt;&lt;a href="#" id="voltageDropSubmit" style="text-decoration: none;" onclick="printAnswer()"&gt;&lt;button type="button"&gt;Calculate&lt;/button&gt;&lt;/a&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;a class="clearBtn" href="#" style="text-decoration: none;"&gt;&lt;button type="button" onclick="formReset()"&gt;Cancel&lt;/button&gt;&lt;/a&gt;&lt;/p&gt; &lt;div class="results-box"&gt; &lt;p id="theAnswer"style="margin: 10px 0;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/div&gt; &lt;/form&gt; &lt;p&gt;Note: Industry standard is a voltage drop of no greater than 10%.&lt;/p&gt; &lt;div class="errorMsg"&gt;&lt;/div&gt; &lt;!-- displays error messages to user --&gt; &lt;/div&gt; &lt;!-- END Calc wrapper --&gt; &lt;script type="text/javascript"&gt; var volts = 0; var acdc = 0; var amps = 0; var length = 0; var awg = 0; var amp = 0; volts = document.getElementsByName("voltDrop_volts")[0].value; acdc = document.getElementsByName("voltDrop_acdc")[0].value; amps = document.getElementsByName("voltDrop_amps")[0].value; length = document.getElementsByName("voltDrop_ft")[0].value; awg = document.getElementsByName("voltDrop_awg")[0].value; var ohm = 0; if (awg === 36) { ohm = 371.0; } else if (awg === 34) { ohm = 237.0; } else if (awg === 32) { ohm = 164.0; } else if (awg === 30) { ohm = 103.0; } else if (awg === 28) { ohm = 64.9; } else if (awg === 26) { ohm = 37.3; } else if (awg === 24) { ohm = 23.3; } else if (awg === 22) { ohm = 14.7; } else if (awg === 20) { ohm = 10.0; } else if (awg === 18) { ohm = 6.4; } else if (awg === 16) { ohm = 4.0; } else if (awg === 14) { ohm = 2.5; } else if (awg === 12) { ohm = 1.6; } else if (awg === 10) { ohm = 1.1; } else if (awg === 8) { ohm = .62; } else if (awg === 6) { ohm = .40; } else if (awg === 4) { ohm = .24; } else if (awg === 2) { ohm = .16; } else if (awg === 1) { ohm = .13; } else if (awg === '1/0') { ohm = .096; } else if (awg === '2/0') { ohm = .077; } else if (awg === '3/0') { ohm = .062; } else if (awg === '4/0') { ohm = .049; } else { msg = "Error"; } var vDrop = ((ohm * 2) * (length / 1000) * amp); var vFinal = (volts - vDrop); function formReset() { document.getElementById("form1").reset(); } function printAnswer() { document.getElementById("theAnswer").innerHTML = vFinal; } &lt;/script&gt; &lt;/body&gt; </code></pre> <p>Note that you're using "amp" when you are setting the value to the "amps"</p>
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    1. POCreating a calculator in JS and getting an undefined. Beginner Programer
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    1. COin that case how will `awg` could have an int value
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    2. COIt is still returning an undefined error. I updated the post with the HTML
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    3. CO@DaronSpence I forgot add [0].value just edited. try again please.
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