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HTML 

              
                <div id="calculator-wrapper">
  <div id="calculator-form">
    <h2>Screen Size Calculator</h2>
    
<!--     <div class="input-field field-metric">
      <label id="metric-attendees" class="active">Attendees</label>
      <label id="metric-budget">Budget</label>
    </div> -->
    
    <div class="input-field field-attendees">
      <label>Approximately how many attendees will you have?</label> 
      <input type="range" id="attendees" name="attendees" 
         min="25" max="2500" value="25" step="25">
      <span id="range-value">25</span>
    </div>
    
    <div class="input-field field-budget" style="display: none;">
      <label>What is your budget?</label> 
      <input type="range" id="budget" name="budget" 
         min="25" max="2500" value="25" step="25">
      <span id="range-value">25</span>
    </div>

    <div class="input-field field-weekday">
      <label>What Day of The Week Do You Need Your Screen?</label>
      <select id="weekday">
        <option value="Sun-Wed">Sun-Wed</option>
        <option value="Thu-Sat">Thu-Sat</option> 
      </select>
    </div>
  </div>

  <div id="calculator-results">
    <h3>Recommended Screen Size: <span id="results-size">10x7 feet</span></h3>
    <p><strong>Price:</strong> <span id="price-wrapper">Starting at $<span id="results-price">299</span></span></p>
    <div class="visualization">
      <div id="person"><img src="https://www.uoe.com/wp-content/uploads/2019/03/people-dark.png"></div>
      <div id="screen-visual" class="a25">10x7 feet</div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  font-family: sans-serif;
}

/* --- Screen Size Calculator --- */

#calculator-wrapper {
	border: solid 6px #d62726;
	background: #ffffff;
	border-radius: 8px;
}

#calculator-form {
	background: #d62826;
	padding: 30px;
}

#calculator-wrapper h2, #calculator-wrapper label, #range-value {
	color: #fff;
}

#range-value {
	font-weight: 700;
}

@media only screen and (min-width:990px) {
	#calculator-wrapper {
		display: grid;
		grid-template-columns: 1fr 2fr;
		grid-gap: 0;
	}
}

#calculator-wrapper .logo {
  max-width: 270px;
}

#calculator-wrapper h2 {
  font-size: 40px;
	margin-bottom: 15px;
  margin-top: 0px;
}

#calculator-wrapper label {
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
}

#calculator-wrapper .input-field {
  margin-bottom: 15px;
}

#calculator-wrapper button {
  padding: 15px 30px;
  border-radius: 4px;
  color: #fff;
  background: #D93332;
  border: none;
  cursor: pointer;
  font-size: 25px;
}

#calculator-wrapper select {
  height: 40px;
  width: 180px;
  font-size: 15px;
	border-radius: 4px;
}

#calculator-results {
  padding: 30px 25px;
}

#attendees {
	width: 350px;
	-webkit-appearance: none;
	height: 10px;
	border-radius: 10px;
	background: #111;
	outline: none;
	opacity: 1;
	width: 100%;
	padding: 0px 10px;
  box-sizing: border-box;
}

#attendees::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  background: #D93332;
	border: solid 3px #fff;
  cursor: pointer;
  border-radius: 50%;
	box-shadow: 0 5px 12px -2px rgba(0,0,0,0.3);
}

#attendees::-moz-range-thumb {
  width: 25px;
  height: 25px;
  background: #4CAF50;
  cursor: pointer;
}

#calculator-wrapper .visualization {
  display: flex;
}

#screen-visual {
  width: 100px;
  height: 70px;
  border: solid 8px #444;
  border-radius: 6px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: all ease 0.4s;
  border-bottom-width: 22px;
  border-right-width: 10px;
  border-left-width: 10px;
  position: relative;
  font-weight: 700;
  color: #444;
  max-width: 100%;
  background: #ccc;
	box-shadow: inset 0px 0px 15px rgba(0,0,0,0.4);
}

#screen-visual::before, #screen-visual::after {
  content: "";
  position: absolute;
  bottom: -14px;
  right: 5px;
  width: 20px;
  height: 7px;
  background: #ccc;
  z-index: 999;
  border-radius: 50px;
}

#screen-visual::before {
	right: -13%;
	bottom: -27px;
	z-index: 0;
	width: 126%;
	background: black;
	border-radius: 50%;
	opacity: 0.2;
	height: 11px;
}

#screen-visual::after {
	width: 22px;
	right: 0;
}

#person {
  display: inline;
  align-self: flex-end;
  margin-right: 10px;
}
#person img {
  max-height: 70px;
  width: auto;
  height: 100%;
}

#screen-visual.a25 {
  width: 100px;
  height: 70px;
}

#screen-visual.a75 {
  width: 120px;
  height: 90px;
}

#screen-visual.a250 {
  width: 160px;
  height: 90px;
}

#screen-visual.a500 {
  width: 200px;
  height: 120px;
}

#screen-visual.a750 {
  width: 260px;
  height: 150px;
}

#screen-visual.a1000 {
  width: 300px;
  height: 170px;
}

#screen-visual.a2500 {
  width: 400px;
  height: 200px;
}

#screen-visual.a5000 {
  width: 520px;
  height: 260px;
}

#results-size, #price-wrapper {
	color: red;
}

#weekday {
	color: black;
	font-weight: 600;
}

@media only screen and (max-width:990px) {
	#person {
		display:none;
	}
}

#calculator-wrapper .input-field.field-metric {
  display: flex;
  margin-bottom: 10px;
}

#calculator-wrapper .input-field.field-metric label {
  font-weight: 500;
  cursor: pointer;
  opacity: 0.7;
  display: inline-block;
  padding: 5px 0;
  margin-right: 10px;
}

#calculator-wrapper .input-field.field-metric label.active {
  font-weight: 700;
  border-bottom: solid 3px #fff;
  opacity: 1;
}
!

JS 

              
                
jQuery(document).ready(function() {

  // Prices
  var low25 = 299
  var high25 = 349
  var low75 = 349
  var high75 = 399
  var low250 = 599
  var high250 = 649
  var low500 = 799
  var high500 = 899
  var low750 = 1199
  var high750 = 1399
  var low1000 = 1899
  var high1000 = 2099
  var low2500 = 2399
  var high2500 = 2599
  var low5000 = 3499
  var high5000 = 3999

  // Screen Sizes
  var size25 = '10x7 feet'
  var size75 = '12x9 feet'
  var size250 = '16x9 feet'
  var size500 = '20x12 feet'
  var size750 = '26x15 feet'
  var size1000 = '30x17 feet'
  var size2500 = '40x20 feet'
  var size5000 = '52x26 feet'

  // Regex function plugin to add commas to numbers
  jQuery.fn.digits = function(){
    return this.each(function(){
      jQuery(this).text( jQuery(this).text().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,") );
    })
  }

  // Adjust range number when changed
  jQuery('input[type=range]').on('input', function () {

    // Get number of attendees in range slider
    var attendeeNumber = jQuery('#attendees').val();

    // Insert number of attendees in span
    jQuery('#range-value').text(attendeeNumber);

    // Add plus sign if it reaches 2500
    if( attendeeNumber > 2499) {
      jQuery('#range-value').append('+');
    }

    // Add commas to number
    jQuery('#range-value').digits();
  });

  // Calculator
  function generate() {

    // Input Values
    var attendeeNumber = jQuery('#attendees').val();
    var weekDay = jQuery('#weekday').val();

    // Determine price - low
    if( weekDay === 'Sun-Wed') {
      if( (attendeeNumber <= 25) ) {
        jQuery('#results-price').text(low25);
        jQuery('#results-size').text(size25);
        jQuery('#screen-visual').text(size25);
        jQuery('#screen-visual').removeClass().addClass('a25');
      }

      if( (attendeeNumber > 25) && (attendeeNumber <= 75) ) {
        jQuery('#results-price').text(low75);
        jQuery('#results-size').text(size75);
        jQuery('#screen-visual').text(size75);
        jQuery('#screen-visual').removeClass().addClass('a75');
      }

      if( (attendeeNumber > 75) && (attendeeNumber <= 250) ) {
        jQuery('#results-price').text(low250);
        jQuery('#results-size').text(size250);
        jQuery('#screen-visual').text(size250);
        jQuery('#screen-visual').removeClass().addClass('a250');
      }

      if( (attendeeNumber > 250) && (attendeeNumber <= 500) ) {
        jQuery('#results-price').text(low500);
        jQuery('#results-size').text(size500);
        jQuery('#screen-visual').text(size500);
        jQuery('#screen-visual').removeClass().addClass('a500');
      }

      if( (attendeeNumber > 500) && (attendeeNumber <= 750) ) {
        jQuery('#results-price').text(low750);
        jQuery('#results-size').text(size750);
        jQuery('#screen-visual').text(size750);
        jQuery('#screen-visual').removeClass().addClass('a750');
      }

      if( (attendeeNumber > 750) && (attendeeNumber <= 1000) ) {
        jQuery('#results-price').text(low1000);
        jQuery('#results-size').text(size1000);
        jQuery('#screen-visual').text(size1000);
        jQuery('#screen-visual').removeClass().addClass('a1000');
      }

      if( (attendeeNumber > 1000) && (attendeeNumber <= 2499) ) {
        jQuery('#results-price').text(low2500);
        jQuery('#results-size').text(size2500);
        jQuery('#screen-visual').text(size2500);
        jQuery('#screen-visual').removeClass().addClass('a2500');
      }

      if( (attendeeNumber >= 2500) ) {
        jQuery('#results-price').text(low5000);
        jQuery('#results-size').text(size5000);
        jQuery('#screen-visual').text(size5000);
        jQuery('#screen-visual').removeClass().addClass('a5000');
      }
    }

    // Determine Price - High
    if( weekDay === 'Thu-Sat') {
      if( (attendeeNumber <= 25) ) {
        jQuery('#results-price').text(high25);
        jQuery('#results-size').text(size25);
        jQuery('#screen-visual').text(size25);
        jQuery('#screen-visual').removeClass().addClass('a25');
      }

      if( (attendeeNumber > 25) && (attendeeNumber <= 75) ) {
        jQuery('#results-price').text(high75);
        jQuery('#results-size').text(size75);
        jQuery('#screen-visual').text(size75);
        jQuery('#screen-visual').removeClass().addClass('a75');
      }

      if( (attendeeNumber > 75) && (attendeeNumber <= 250) ) {
        jQuery('#results-price').text(high250);
        jQuery('#results-size').text(size250);
        jQuery('#screen-visual').text(size250);
        jQuery('#screen-visual').removeClass().addClass('a250');
      }

      if( (attendeeNumber > 250) && (attendeeNumber <= 500) ) {
        jQuery('#results-price').text(high500);
        jQuery('#results-size').text(size500);
        jQuery('#screen-visual').text(size500);
        jQuery('#screen-visual').removeClass().addClass('a500');
      }

      if( (attendeeNumber > 500) && (attendeeNumber <= 750) ) {
        jQuery('#results-price').text(high750);
        jQuery('#results-size').text(size750);
        jQuery('#screen-visual').text(size750);
        jQuery('#screen-visual').removeClass().addClass('a750');
      }

      if( (attendeeNumber > 750) && (attendeeNumber <= 1000) ) {
        jQuery('#results-price').text(high1000);
        jQuery('#results-size').text(size1000);
        jQuery('#screen-visual').text(size1000);
        jQuery('#screen-visual').removeClass().addClass('a1000');
      }

      if( (attendeeNumber > 1000) && (attendeeNumber <= 2499) ) {
        jQuery('#results-price').text(high2500);
        jQuery('#results-size').text(size2500);
        jQuery('#screen-visual').text(size2500);
        jQuery('#screen-visual').removeClass().addClass('a2500');
      }

      if( (attendeeNumber >= 2500) ) {
        jQuery('#results-price').text(high5000);
        jQuery('#results-size').text(size5000);
        jQuery('#screen-visual').text(size5000);
        jQuery('#screen-visual').removeClass().addClass('a5000');
      }
    }

    // Apply comma regex function to price
    jQuery('#results-price').digits();

  }

  // Generate results
  jQuery('input[type=range]').on('input', generate);
  jQuery('select').on('input', generate);

});
!
999px

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