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HTML

              
                <div class="exposure-calculator">
  <h1 class="exposure-page-title">Exposure Calculator</h1>
  <div class="exposure-property-holder">
    <div id="aperture" class="exposure-property">
      <h3 class="exposure-property-title">Aperture Value:</h3>
      <select name="aperture-value" id="aperture-value">
          <option value="1" class="full-stop">f/1</option>
          <option value="1.122" class="third-stop">f/1.1</option>
          <option value="1.26" class="third-stop">f/1.2</option>
          <option value="1.414" class="full-stop">f/1.4</option>
          <option value="1.587" class="third-stop">f/1.6</option>
          <option value="1.782" class="third-stop">f/1.8</option>
          <option value="2" class="full-stop">f/2</option>
          <option value="2.245" class="third-stop">f/2.2</option>
          <option value="2.52" class="third-stop">f/2.5</option>
          <option value="2.828" class="full-stop">f/2.8</option>
          <option value="3.175" class="third-stop">f/3.2</option>
          <option value="3.564" class="third-stop">f/3.5</option>
          <option value="4" class="full-stop">f/4</option>
          <option value="4.49" class="third-stop">f/4.5</option>
          <option value="5.04" class="third-stop">f/5.0</option>
          <option value="5.657" class="full-stop">f/5.6</option>
          <option value="6.35" class="third-stop">f/6.3</option>
          <option value="7.127" class="third-stop">f/7.1</option>
          <option value="8" class="full-stop">f/8</option>
          <option value="8.98" class="third-stop">f/9</option>
          <option value="10.079" class="third-stop">f/10</option>
          <option value="11.314" class="full-stop" selected="">f/11</option>
          <option value="12.699" class="third-stop">f/13</option>
          <option value="14.254" class="third-stop">f/14</option>
          <option value="16.0" class="full-stop">f/16</option>
          <option value="17.959" class="third-stop">f/18</option>
          <option value="20.159" class="third-stop">f/20</option>
          <option value="22.627" class="full-stop">f/22</option>
          <option value="25.398" class="third-stop">f/25</option>
          <option value="28.509" class="third-stop">f/28</option>
          <option value="32" class="full-stop">f/32</option>
          <option value="35.919" class="third-stop">f/36</option>
          <option value="40.318" class="third-stop">f/40</option>
          <option value="45.255" class="full-stop">f/45</option>
          <option value="50.797" class="third-stop">f/50</option>
          <option value="57.018" class="third-stop">f/57</option>
          <option value="64" class="full-stop">f/64</option>
          <option value="71.838" class="third-stop">f/72</option>
          <option value="80.635" class="third-stop">f/80</option>
          <option value="90.51" class="full-stop">f/90</option>
        </select>
    </div>

    <div id="shutterSpeed" class="exposure-property">
      <h3 class="exposure-property-title">Shutter Speed:</h3>
      <select name="shutterSpeed-value" id="shutterSpeed-value">
          <option value="0.0001221" class="full-stop">1/8000</option>
          <option value="0.0001538" class="third-stop">1/6400</option>
          <option value="0.0001938" class="third-stop">1/5000</option>
          <option value="0.0002441" class="full-stop">1/4000</option>
          <option value="0.0003076" class="third-stop">1/3200</option>
          <option value="0.0003875" class="third-stop">1/2500</option>
          <option value="0.00048828" class="full-stop">1/2000</option>
          <option value="0.0006152" class="third-stop">1/1600</option>
          <option value="0.0007751" class="third-stop">1/1250</option>
          <option value="0.0009766" class="full-stop">1/1000</option>
          <option value="0.0012304" class="third-stop">1/800</option>
          <option value="0.0015502" class="third-stop">1/640</option>
          <option value="0.0019531" class="full-stop">1/500</option>
          <option value="0.0024608" class="third-stop">1/400</option>
          <option value="0.0031004" class="third-stop">1/320</option>
          <option value="0.0039063" class="full-stop">1/250</option>
          <option value="0.0049216" class="third-stop">1/200</option>
          <option value="0.0062008" class="third-stop">1/160</option>
          <option value="0.0078125" class="full-stop" selected="">1/125</option>
          <option value="0.0098431" class="third-stop">1/100</option>
          <option value="0.0124016" class="third-stop">1/80</option>
          <option value="0.015625" class="full-stop">1/60</option>
          <option value="0.0196863" class="third-stop">1/50</option>
          <option value="0.0248031" class="third-stop">1/40</option>
          <option value="0.03125" class="full-stop">1/30</option>
          <option value="0.0393725" class="third-stop">1/25</option>
          <option value="0.0496063" class="third-stop">1/20</option>
          <option value="0.0625" class="full-stop">1/15</option>
          <option value="0.0787451" class="third-stop">1/13</option>
          <option value="0.0992126" class="third-stop">1/10</option>
          <option value="0.125" class="full-stop">1/8</option>
          <option value="0.1574901" class="third-stop">1/6</option>
          <option value="0.1984251" class="third-stop">1/5</option>
          <option value="0.25" class="full-stop">1/4</option>
          <option value="0.3149803" class="third-stop">1/3</option>
          <option value="0.3968503" class="third-stop">1/2.5</option>
          <option value="0.5" class="full-stop">1/2</option>
          <option value="0.6299605" class="third-stop">1/1.6</option>
          <option value="0.7937005" class="third-stop">1/1.3</option>
          <option value="1.0" class="full-stop">1 second</option>
          <option value="1.2599" class="third-stop">1.3"</option>
          <option value="1.5874" class="third-stop">1.6"</option>
          <option value="2" class="full-stop">2"</option>
          <option value="2.5198" class="third-stop">2.5"</option>
          <option value="3.1748" class="third-stop">3"</option>
          <option value="4" class="full-stop">4"</option>
          <option value="5.0397" class="third-stop">5"</option>
          <option value="6.3496" class="third-stop">6"</option>
          <option value="8" class="full-stop">8"</option>
          <option value="10.0794" class="third-stop">10"</option>
          <option value="12.6992" class="third-stop">13"</option>
          <option value="16" class="full-stop">16"</option>
          <option value="20.1587" class="third-stop">20"</option>
          <option value="25.3984" class="third-stop">25"</option>
          <option value="32" class="full-stop">30"</option>
          <option value="40.3174" class="third-stop">40"</option>
          <option value="50.7968" class="third-stop">50"</option>
          <option value="64" class="full-stop">60"</option>
        </select>
    </div>

    <div id="iso" class="exposure-property">
      <h3 class="exposure-property-title">ISO:</h3>
      <select name="iso-value" id="iso-value">
          <option value="6.25/6" class="full-stop">6</option>
          <option value="7.875/8" class="third-stop">8</option>
          <option value="9.921/10" class="third-stop">10</option>
          <option value="12.5/12" class="full-stop">12</option>
          <option value="15.749/16" class="third-stop">16</option>
          <option value="19.843/20" class="third-stop">20</option>
          <option value="25/25" class="full-stop">25</option>
          <option value="31.498/32" class="third-stop">32</option>
          <option value="39.685/40" class="third-stop">40</option>
          <option value="50/50" class="full-stop">50</option>
          <option value="62.996/64" class="third-stop">64</option>
          <option value="79.37/80" class="third-stop">80</option>
          <option value="100/100" class="full-stop" selected="">100</option>
          <option value="125.992/125" class="third-stop">125</option>
          <option value="158.74/160" class="third-stop">160</option>
          <option value="200/200" class="full-stop">200</option>
          <option value="251.984/250" class="third-stop">250</option>
          <option value="317.48/320" class="third-stop">320</option>
          <option value="400/400" class="full-stop">400</option>
          <option value="503.968/500" class="third-stop">500</option>
          <option value="634.96/640" class="third-stop">640</option>
          <option value="800/800" class="full-stop">800</option>
          <option value="1007.937/1000" class="third-stop">1000</option>
          <option value="1269.921/1250" class="third-stop">1250</option>
          <option value="1600/1600" class="full-stop">1600</option>
          <option value="2015.874/2000" class="third-stop">2000</option>
          <option value="2539.841/2500" class="third-stop">2500</option>
          <option value="3200/3200" class="full-stop">3200</option>
          <option value="4031.747/4000" class="third-stop">4000</option>
          <option value="5079.683/5000" class="third-stop">5000</option>
          <option value="6400/6400" class="full-stop">6400</option>
          <option value="8063.494/8000" class="third-stop">8000</option>
          <option value="10159.366/10000" class="third-stop">10000</option>
          <option value="12800/12800" class="full-stop">12800</option>
          <option value="16126.989/16000" class="third-stop">16000</option>
          <option value="20318.7/20000" class="third-stop">20000</option>
          <option value="25600/25600" class="full-stop">25600</option>
          <option value="32254/32000" class="third-stop">32000</option>
          <option value="40637/40000" class="third-stop">40000</option>
          <option value="51200/51200" class="full-stop">51200</option>
          <option value="64508/64000" class="third-stop">64000</option>
          <option value="81275/80000" class="third-stop">80000</option>
          <option value="102400/102400" class="full-stop">102400</option>
        </select>
    </div>
  </div>
  <button onclick="calculateExposure()" type="button" class="submitButton">Calculate Exposure Information &raquo;</button>

  <div class="exposure-border"></div>

  <div class="ev-holder">
    <div class="equivalent-values">
      <h3 class="exposure-property-title">Exposure Value:</h3>
      <span id="exposure-value" class="exposure-value">-</span> EV
    </div>
    <div class="equivalent-values">
      <h3 class="exposure-property-title">Light Value:</h3>
      <span id="light-value" class="exposure-value">-</span> EV<sub id="light-value-iso"></sub>
    </div>
  </div>

  <div class="actual-exposure-holder">
    <h3 class="exposure-property-title">Actual Exposure Information: </h3>
    <div class="actual-exposure-information">
      <span class="exposure-value-title">Actual Aperture Value:</span>
      <span class="exposure-value" id="actual-aperture-value"></span>
    </div>
    <div class="actual-exposure-information">
      <span class="exposure-value-title">Actual ShutterSpeed:</span>
      <span class="exposure-value" id="actual-shutterspeed-value"></span>
    </div>
    <div class="actual-exposure-information">
      <span class="exposure-value-title">Actual ISO:</span>
      <span class="exposure-value" id="actual-iso-value"></span>
    </div>
  </div>

  <div class="camera-settings-holder">
    <h3 class="exposure-property-title">Exposure Settings: </h3>
    <div class="updated-exposure-information">
      <span class="exposure-value-title">Aperture Value:</span>
      <span class="exposure-value" id="camera-aperture-value"></span>
    </div>
    <div class="updated-exposure-information">
      <span class="exposure-value-title">Shutter Speed:</span>
      <span class="exposure-value" id="camera-shutterspeed-value"></span>
    </div>
    <div class="updated-exposure-information">
      <span class="exposure-value-title">ISO:</span>
      <span class="exposure-value" id="camera-iso-value"></span>
    </div>
  </div>

  <div class="exposure-border"></div>
  <div class="nd-filter-holder">
    <div class="filter-strength-select">
      <h3 class="exposure-property-title">Neutral Density Filter Strength:</h3>
      <select name="ndFilter" id="ndFilter" onchange="calculateFilterExposure()">
          <option value="0" class="" selected="">None </option>
          <option value="1" class="">2x - ND 0.3</option>
          <option value="2" class="">4x - ND 0.6</option>
          <option value="3" class="">8x - ND 0.9</option>
          <option value="6" class="">64x - ND 1.8</option>
          <option value="10" class="">1000x - ND 3.0</option>
        </select>
    </div>

    <h3 class="exposure-property-title">Filter blocks <span id="filter-values"></span> stops of light</h3>

    <h3 class="exposure-property-title">Exposure Settings with Filter: </h3>
    <div class="updated-exposure-information">
      <span>Aperture Value:</span>
      <span class="exposure-value" id="filtered-aperture-value"></span>
    </div>
    <div class="updated-exposure-information">
      <span>Shutter Speed:</span>
      <span class="exposure-value" id="filtered-shutterSpeed-value"></span>
    </div>
    <div class="updated-exposure-information">
      <span>ISO:</span>
      <span class="exposure-value" id="filtered-iso-value"></span>
    </div>
  </div>
</div>
              
            
!

CSS

              
                html {
  background-image: url("https://r0bsc0tt.com/wp-content/uploads/2016/12/bgimage.jpg");
  font-family: Open Sans;
  font-size: 16px;
  margin: 0 2em;
  word-wrap: break-word;
}

.exposure-calculator {
  background-color: white;
  border: 4px double black;
  max-width: 50%;
  margin: 0.75rem auto;
  padding-left: 25px;
  padding-right: 25px;
}

.exposure-page-title {
  color: #69c;
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1;
  text-align: center;
  text-shadow: 1px 1px black, 2px 2px black;
  text-transform: uppercase;
}

.exposure-property {
  display: block;
}

.exposure-property-title {
  margin-bottom: .25em;
}

.exposure-property .exposure-property-title {
  text-align: center;
}

.exposure-border {
  border-style: double;
  margin: 1em 0;
}

select {
  background-color: #efefef;
  font-size: 1.5em;
}

.full-stop {
  background-color: #fff;
  font-size: 1.0125em;
  font-weight: 900;
}

.third-stop {
  color: #333;
}

button {
  margin-top: 1em;
}

.submitButton,
.ev-holder,
.actual-exposure-holder,
.exposure-settings-holder,
.actual-exposure-information,
.updated-exposure-information,
select {
  width: 100%;
}

.submitButton {
  font-size: 1.125em;
  font-weight: 700;
  height: 2.5em;
  line-height: 1;
  margin: 2em 0 1em;
}

.actual-exposure-holder,
.camera-settings-holder {
  display: block;
}

.actual-exposure-holder .exposure-property-title,
.camera-settings-holder .exposure-property-title,
.nd-filter-holder .exposure-property-title {
  font-size: 1em;
  font-weight: 900;
  text-align: center;
  text-transform: uppercase;
}

.equivalent-values,
.actual-exposure-information span,
.updated-exposure-information span {
  font-weight: 900;
  line-height: 1;
}

.equivalent-values {
  display: inline-block;
  line-height: 1;
  width: 48%;
}

.equivalent-values:nth-child(1) {}

.equivalent-values:nth-child(2) {
  float: right;
  margin-left: 1%;
  text-align: right;
}

.exposure-value-title {
  color: #666;
}

.exposure-value {
  color: #6699cc;
  font-size: 2em;
}

.actual-exposure-information,
.updated-exposure-information {
  display: inline-block;
  line-height: 1.5;
  width: 32%;
}

.actual-exposure-information span,
.updated-exposure-information span {
  display: block;
}

.actual-exposure-information:nth-child(3n+2),
.updated-exposure-information:nth-child(3n+2) {
  float: left;
  text-align: left;
}

.actual-exposure-information:nth-child(3n+0),
.updated-exposure-information:nth-child(3n+0) {
  text-align: center;
}

.actual-exposure-information:nth-child(3n+1),
.updated-exposure-information:nth-child(3n+1) {
  float: right;
  text-align: right;
}
              
            
!

JS

              
                var exposureSettings = [];

var calculateExposure = function(exposureProperty) {
  "use strict";

  var getExposureValues = (function() {
    // Loop through each element from ExposureProperties
    for (var i = exposureProperties.length - 1; i >= 0; i--) {
      //set current elements id in DOM to variable, then add option values to array
      var currentExposureProperty = document.getElementById(exposureProperties[i] + "-value");
      if (currentExposureProperty) {
        var currentExposurePropertyName = exposureProperties[i];
        var currentExposurePropertyIndex = currentExposureProperty.selectedIndex;
        var currentExposurePropertySettingValue = currentExposureProperty.options[currentExposurePropertyIndex].text;
        var currentExposurePropertyActualValue = currentExposureProperty.options[currentExposurePropertyIndex].value;
        //add settings to array
        exposureSettings[i] = [currentExposurePropertyName, currentExposurePropertySettingValue, currentExposurePropertyActualValue, currentExposurePropertyIndex, currentExposureProperty];
      } else {
        console.log(exposureProperties[i] + "-value" + " not found");
      } //end if
    } //end for
  })();

  //Append HTML for settings information
  var addExposureSettingsHTML = (function() {
    if (typeof exposureSettings[0] === "object") {
      // Add Camera Exposure Settings
      document.getElementById("camera-aperture-value").innerHTML = exposureSettings[0][1];
      document.getElementById("camera-shutterspeed-value").innerHTML = exposureSettings[1][1];
      document.getElementById("camera-iso-value").innerHTML = exposureSettings[2][1];
      //Add Actual Exposure Settings
      document.getElementById("actual-aperture-value").innerHTML = exposureSettings[0][2];
      document.getElementById("actual-shutterspeed-value").innerHTML = exposureSettings[1][2];
      document.getElementById("actual-iso-value").innerHTML = exposureSettings[2][2].split("/")[0];
    }
  })();

  //Get Equivalent Exposure Value
  var equivalentExposureValues = (function() {
    if (typeof exposureSettings[0] === "object") {
      // Equivalent Exposure is calculated using log2(aperture * apeture / shutterspeed)
      var eev = Math.log2(Number(exposureSettings[0][2]) * Number(exposureSettings[0][2]) / Number(exposureSettings[1][2]));
      // Light Value is calculated using (log2(aperture * apeture / shutterspeed)) + log2(iso / 100)
      var light = Math.log2(Number(exposureSettings[2][2].split("/")[0]) / 100);
      var lev = eev + light;

      //Equivalent Exposure values as HTML
      document.getElementById("exposure-value").innerHTML = eev.toFixed(2);
      document.getElementById("light-value").innerHTML = lev.toFixed(2);
      document.getElementById("light-value-iso").innerHTML = exposureSettings[2][1];
    }
  })();

}; // close calculateExposure

//Find shutter speed with filter
var calculateFilterExposure = function() {
  //ND Filter Values
  var ndFilter = document.getElementById("ndFilter");
  var ndValue = ndFilter.selectedIndex;
  var shutterSpeedCurrent = exposureSettings[1][1];
  var shutterSpeedOption = exposureSettings[1][4].options[exposureSettings[1][3]];

  if (ndValue === 1) {
    var oneStop = exposureSettings[1][3];
    oneStop = oneStop + 3;
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][4].options[oneStop].text;
  } else if (ndValue === 2) {
    var twoStop = exposureSettings[1][3];
    twoStop = twoStop + 6;
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][4].options[twoStop].text;
  } else if (ndValue === 3) {
    var threeStop = exposureSettings[1][3];
    threeStop = threeStop + 9;
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][4].options[threeStop].text;
  } else if (ndValue === 4) {
    var sixStop = exposureSettings[1][3];
    sixStop = sixStop + 18;
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][4].options[sixStop].text;
  } else if (ndValue === 5) {
    var tenStop = exposureSettings[1][3];
    tenStop = tenStop + 30;
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][4].options[tenStop].text;
  } else {
    document.getElementById("filtered-shutterSpeed-value").innerHTML = exposureSettings[1][1];
  };

  //console.log(ndFilter);
  //console.log(ndValue);
  document.getElementById("filter-values").innerHTML = ndFilter.options[ndValue].value;
  document.getElementById("filtered-aperture-value").innerHTML = exposureSettings[0][1];
  document.getElementById("filtered-iso-value").innerHTML = exposureSettings[2][1];

};

var exposureProperties = ["aperture", "shutterSpeed", "iso"];
calculateExposure(exposureProperties);
              
            
!
999px

Console