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HTML

              
                <html>

<head>
  <title>Barbell Calculator</title>
  <meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' name='viewport' />
</head>

<body>
  <div class="main">
  <h1>Barbell Calculator</h1>
    <div class="plates-form">
      <div class="plates-form--content" style="display: none;">
        <div class="input-area">
          <h2 class="input-head inline">Bar</h2>
          <label for="bar">Weight</label>:
          <input type="number" id="bar" value="45"> Lbs
        </div>
        <div class="input-area">
          <h2 class="input-head">Plates</h2>
          <div class="w-50">
            <label for="plate-45">45</label>:
            <input class="plate-calc" type="number" id="plate-45" data-plate="45" value="">
            <label for="plate-35">35</label>:
            <input class="plate-calc" type="number" id="plate-35" data-plate="35" value="">
          </div>
          <div class="w-50">
            <label for="plate-25">25</label>:
            <input class="plate-calc" type="number" id="plate-25" data-plate="25" value="">
            <label for="plate-10">10</label>:
            <input class="plate-calc" type="number" id="plate-10" data-plate="10" value="">
          </div>
          <div class="w-50">
            <label for="plate-5">5</label>:
            <input class="plate-calc" type="number" id="plate-5" data-plate="5" value="">
            <label for="plate-2-5">2.5</label>:
            <input class="plate-calc" type="number" id="plate-2-5" data-plate="2-5" value="">
          </div>
        </div>
      </div>
      <button class="hide hide-plates">Show Weight Inventory</button>
    
    </div>
  <div class="plates">
    <div class="total-form">
        <div class="total">
          <p>Plate Weight: <span class="total-amount" id="total-available-amount-plates"></span> Lbs</p>
          <p>Total Lift Max: <span class="total-amount" id="total-available-amount-all"></span> Lbs</p>
        </div>
      <div id="total-error" class="error" style="display: none;">Not enough weight available.</div>
      <div id="min-error" style="display: none;">Please enter an amount over bar weight.</div>
      <h2 class="input-head">Calculator</h2>
      <label for="total">Amount</label>:
      <input class="lift-input" type="number" id="total">
    </div>
    <div>Actual: <span class="total-amount" id="actual-amount"></span> Lbs</div>
    <div>Remain: <span class="total-amount" id="amount-remain"></span> Lbs</div>
    <div>Recommended: <span class="total-amount" id="rounded-amount"> Lbs</span></div>
    <div class="bar">
      <div class="side left-side">
      </div>
      <div class="side right-side">
      </div>
    </div>
    <div class="content">
    <h2 class="info-head"> Plates Per Side </h2>
    <ul class="info">
      <li class="plate-45">45 lbs: <span></span></li>
      <li class="plate-35">35 lbs: <span></span></li>
      <li class="plate-25">25 lbs: <span></span></li>
      <li class="plate-10">10 lbs: <span></span></li>
      <li class="plate-5">5 lbs: <span></span></li>
      <li class="plate-2-5">2.5 lbs: <span></span></li>
    </ul>
    </div>
  </div>
  </div>
</body>

</html>
              
            
!

CSS

              
                body {
  height: auto;
}
.total-form {}
.main {
  max-width: 960px;
}
input[type='text'],
input[type='number'],
textarea {
  font-size: 16px;
}
.error {
  color: red;
}
.hide-plates {
  border-radius: 5px;
  border: 2px solid #ccc;
}
.hide-plates.hide {
  background-color: #333;
  color: #fff;
}

.hide-plates.show {
  background-color: #0ae;
  color: #eee;
}

.total,
.input-area {
  padding: 0.5em 0;
  margin: auto;
}
.total {
  margin: 1em auto;
}

.total-amount {
  font-size: 1.05em;
  font-weight: bold;
}

.input-head {
  font-size: 1.1em;
  padding: 0.25em 0;
}

.plates, .plates-form {
  width: 100%;
}
.plates-form--content {
  display: flex;
  width: 100%;
}
.remainder-1 {
  background-color: #fee;
}
.remainder-2 {
  background-color: #fcc;
}
.remainder-3 {
  background-color: #faa;
}
.remainder-4 {
  background-color: #f88;
}
.w-50 {
  width: 100%;
  display: flex;
  margin-bottom: 0.5em;
}

.w-50 label {
  width: 2em;
  margin: auto;
  text-align: right;
}

.plates-form input {
  width: 40px;
  margin: auto;
}

.inline {
  display: inline-block;
}

.bar {
  position: relative;
    max-width: 400px;
  background-color: #333;
  height: 4px;
  margin: 95px 0px;
}

.bar .side {
  position: absolute;
  width: 40%;
}

.bar .left-side {
  left: 0;
}

.bar .left-side span {
  float: right;
}

.bar .right-side span {
  float: left;
}

.bar .right-side {
  right: 0;
}

.bar .side span {
  width: 8%;
  border: 1px solid #000;
  margin-left: 1px;
}

.bar .plate-45 {
  height: 90px;
  background-color: #333;
  margin-top: -43px;
  border: 1px solid #000;
}

.bar .plate-35 {
  height: 70px;
  margin-top: -33px;
  background-color: #666;
  border: 1px solid #000;
}

.bar .plate-25 {
  height: 50px;
  margin-top: -23px;
  background-color: #999;
  border: 1px solid #000;
}

.bar .plate-10 {
  height: 25px;
  margin-top: -10px;
  background-color: #ccc;
  border: 1px solid #000;
}

.bar .plate-5 {
  height: 20px;
  margin-top: -6px;
  background-color: #eee;
  border: 1px solid #000;
}

.bar .plate-2-5 {
  height: 10px;
  margin-top: -3px;
  background-color: #fff;
  border: 1px solid #000;
}

.info {
  display: block;
  padding: 0;
  margin: 0 1em;
  list-style: none;
}

.info-head {
  margin-top: 1em;
}

.info li {
  padding-left: 0.5em;
  padding-bottom: 0.5em;
  font-size: 1.1em;
}

.info li span {
  font-weight: bold;
  font-size: 0.95em;
}

.content {
  clear: both;
  display: block;
  width: 100%;
}
              
            
!

JS

              
                workoutCalculator = (function() {
  var barWeight = 45,
    plates = [45, 35, 25, 10, 5, 2.5],
    // Default invetory, should be overriden by local storage.
    plateObject = {
      '45': 4,
      '35': 4,
      '25': 4,
      '10': 4,
      '5': 4,
      '2-5': 4
    },
    total = 0,
    sidePlates = [];

  $('document').ready(function() {
    if (localStorage) {
      var LSPlates = localStorage.getItem('plateWeight');
      if (LSPlates) {
        plateObject = JSON.parse(LSPlates);
      }
    }
    calculatePlateWeight();

    $('.calc-plates').on('click', calculatePlateWeight);
    $('.hide-plates').on('click', togglePlateCalc);
  });

  function togglePlateCalc() {
    $('.plates-form--content').toggle();
    $('.hide-plates').toggleClass('hide show');
    return false;
  }

  $('.plate-calc').on('change', function(e) {
    $plate = $(e.target);
    plateObject[$plate.data('plate')] = $plate.val();
    calculatePlateWeight();

    if (localStorage) {
      localStorage.setItem('plateWeight', JSON.stringify(plateObject));
    }
  });

  function calculatePlateWeight() {
    var total = null,
      barWeight = $('#bar').val() * 1;
    _.each(plateObject, function(value, key) {
      var weight = key * 1;
      $('#plate-' + key).val(value);
      if (key === '2-5') {
        weight = 2.5;
      }
      total += weight * value;
    });

    $("#total-available-amount-plates").text(total);
    $("#total-available-amount-all").text(total + barWeight);
    window.totalLiftAmount = total + barWeight;
    window.barWeight = barWeight;
  }

  $('#total').on('keyup', function(e, v) {
    var weight = $(e.target).val();
    if ( weight > (window.totalLiftAmount)) {
      $("#total-error").show();
      return false;
    } else { 
      $("#total-error").hide();
    }
    
    if ( weight < (window.barWeight)) {
      $("#min-error").show();
      return false;
    } else { 
      $("#min-error").hide();
    }
    
    sidePlates = [];
    getWeights(weight);
    $('.bar .side').html('');
    _.each(sidePlates, function(plate) {
      var plateClass = 'plate-' + plate.weight.toString().replace('.', '-');
      var $li = $('.' + plateClass),
        $barLeft = $('.bar .left-side');
      $barRight = $('.bar .right-side');
      if (plate.multiplier > 0) {
        $li.show();
        $li.find('span').text(plate.multiplier);
        for (i = 0; i < plate.multiplier; i++) {
          $barLeft.append('<span class="' + plateClass + '">')
          $barRight.append('<span class="' + plateClass + '">');
        }
      } else {
        $li.hide();
      }
    });
  });

  getRealPlateKey = function(key) {
    return key.toString().replace('.', '-');
  }

  getWeights = function(weight) {
    $('.bar .side').html('Loading');
    var plateWeight = weight - barWeight,
      sideWeight = plateWeight / 2,
      remain = sideWeight;
    _.each(plates, function(plate) {
      var num = 0,
        iterationPlates = null,
        plateWeightAvailable = plateObject[getRealPlateKey(plate)],
        remainder;
      if (plate <= remain && plateWeightAvailable > 0) {
        num = _.parseInt(remain / plate);
        if (num > (plateWeightAvailable / 2)) {
          num = (plateWeightAvailable / 2);
        }
        remain -= (num * plate);
      } else {
        num = 0;
      }
      remainder = remain * 2;
      if ((remainder + barWeight) > 0) {
        var actual = weight - remainder;
        $('#amount-remain').html(remainder).removeClass().addClass('remainder-' + remainder.toString());
        $('#actual-amount').html(actual);
        if (remainder > 2) {
          $('#rounded-amount').html(actual*1 + 5);
        } else {
          $('#rounded-amount').html(actual);
        }
      }
      iterationPlates = {
        'weight': plate,
        'multiplier': num
      }
      sidePlates.push(iterationPlates);
    });
  }
  return {
    getWeights
  }
})();
              
            
!
999px

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