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HTML 

              
                <div class="container">
  <h1>Weight loss Calculator</h1>
  <form name="basalForm" id="basalForm">

    <ul class="questions">
      <h2>Questions</h2>
      <li>Your Gender <select name="sex">
          <option value="male">Male</option>
          <option value="female">Female</option>
        </select></li>
      <li>Age (Years) <input type="number" name="age" maxlength="3" size="3" required></li>
      <li>Your weight (lbs)<input type="number" name="weight" maxlength="3" size="3" required></li>
      <li>Your Height (inches)<input type="number" name="height" maxlength="3" size="3" required></li>
      <li>Your Activity level (PAL)
        <select name="activityLevel">
          <option value="sedentary">Sedentary (less than 30min a week)</option>
          <option value="lightExercise">Light exercise (90min a week) </option>
          <option value="moderateExercise">Moderate exercise (aerobic exercise, 120min a week)</option>
          <option value="veryActive">Very active (150min a week)</option>
          <option value="extreme">Extreme (Athlete status)</option>
        </select>
      </li>
    </ul>
    <div class="buttons">
      <input type="reset" value="Reset" />
      <input type="button" value="Calculate calorie levels" onClick="calculateBasal(); calculatePal(); calculateBmi(); weightCat(); eat();" id="calculate">
    </div>

    <ul class="answers">
      <h2>Answers</h2>
      <li>Your body needs at rest during a typical day <input type="text" name="basal" size="12"></li>
      <li>Calories burned during a typical day<input type="text" name="pal" size="12"><cite>Based on your
          activity
          level (PAL)</cite></li>
      <li>Your body should lose (per day) approx. <input type="text" name="calLose" size="12"></li>

      <li>Your BMI (Body Mass Index) <input type="text" name="bmi" size="12"></li>
      <li>Your weight category <input type="text" name="weightCategory" size="12"></li>
    </ul>

  </form>

  <div class="message" id="message">
    If you lose 500 Kcals a day, you would lose about 1lb of weight a week.<br>

    BMI Formula = [Weight (lbs) / Height (inches)²] x 703 or Weight (kg) / Height (m) 2 <cite><a href="https://www.diabetes.co.uk/bmi.html">diabetes.co.uk</a></cite>
    <br>
    Example Input = 42yrs, 170lbs , 67inches
  </div>
  <!--message-->

</div> <!-- container-->
!

CSS 

              
                *,
html,
body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size: 16px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    width: 100%;
    height: 100%;
}

.container {
  padding:3em;

    form#basalForm {
        width: max-content;
        height: max-content;
        display: flex;
        flex-direction: column;
        padding: 20px;

        input[type=button]#calculate {
            background-color: rgba(67, 126, 67, 0.616);
            color: #fff;
          font-weight: 600;
            padding: 8px 12px;
            margin: 20px 0px;
            cursor: pointer;
            border: none;
            border-radius: 2px;
          
          &:hover{
            background-color: rgba(67, 126, 67, 0.8);
          }
          
        }

        input:invalid {
            background-color: rgba(240, 119, 119, 0.384);
        }

        input[type=reset] {
            background-color: rgba(238, 176, 176, 0.603);
            width: max-content;
            color: darkslategray;
            padding: 2px 6px;
            margin: 20px 0px;
            border: none;
            border-radius: 2px;
            cursor: pointer;
          &:hover{
            background-color: rgba(238, 176, 176, 0.9);
          }
        }

        input[type=text] {
            padding-left: 8px;
            margin-left: 8px;
        }

        .buttons {
            display: flex;
            justify-content: space-between;
        }

        ul.questions,
        ul.answers {
            li {
                list-style: none;
                width: 100%;
                display: flex;
                position: relative;
                justify-content: space-between;
                padding: 8px 0px;
              margin-right: 10px;

                select {
                    min-width: 80px;
                }

                input {
                    min-width: 80px;
                    max-width: min-content;
                    border: none;
                    border-bottom: 1px solid grey;
                }

                cite {
                    position: absolute;
                    width: 100%;
                    height: max-content;
                    left: 0;
                    bottom: -8px;
                    color: grey;
                    font-size: 0.8em;
                }
            } //LI
        } // UL




    }// END FORM
}//container
!

JS 

              
                function calculateBasal() {
    var sex = document.basalForm.sex.value;
    var age = document.basalForm.age.value;
    var weight = document.basalForm.weight.value;
    var height = document.basalForm.height.value;
    var activityLevel = document.basalForm.activityLevel.value;


    if (document.basalForm.sex.value == "female") {
        basal = 655 + (4.35 * weight) + (4.7 * height) - (4.7 * age);
        return document.basalForm.basal.value = basal.toFixed(2) + " Kcals";
    } else {
        basal = 66.47 + (6.23 * weight) + (12.7 * height) - (6.755 * age);
        return document.basalForm.basal.value = basal.toFixed(2) + " Kcals";
    };
}



function calculatePal() {
    var sex = document.basalForm.sex.value;
    var age = document.basalForm.age.value;
    var weight = document.basalForm.weight.value;
    var height = document.basalForm.height.value;
    var activityLevel = document.basalForm.activityLevel.value;


    if (document.basalForm.activityLevel.value == "sedentary") {
        activityLevel = 1.2
        var pal = basal * activityLevel;
        return document.basalForm.pal.value = pal.toFixed(2) + " Kcals";
    } else if (document.basalForm.activityLevel.value == "lightExercise") {
        activityLevel = 1.375
        var pal = basal * activityLevel;
        return document.basalForm.pal.value = pal.toFixed(2) + " Kcals";
    } else if (document.basalForm.activityLevel.value == "moderateExercise") {
        activityLevel = 1.55
        var pal = basal * activityLevel;
        return document.basalForm.pal.value = pal.toFixed(2) + " Kcals";
    } else if (document.basalForm.activityLevel.value == "veryActive") {
        activityLevel = 1.725
        var pal = basal * activityLevel;
        return document.basalForm.pal.value = pal.toFixed(2) + " Kcals";
    } else {
        activityLevel = 1.9
        var pal = basal * activityLevel;
        return document.basalForm.pal.value = pal.toFixed(2) + " Kcals";
    }
}

function calculateBmi() {
    var height = document.basalForm.height.value;
    var weight = document.basalForm.weight.value;
    var bmi = (weight / (height * height)) * 703;
    return document.basalForm.bmi.value = bmi.toFixed(2);
}

function weightCat() {
    bmi = document.basalForm.bmi.value;

    if (bmi > 39.9) {
        return document.basalForm.weightCategory.value = "Morbidly obese";
    } else if (bmi > 29.9) {
        return document.basalForm.weightCategory.value = "Obese";
    } else if (bmi > 24.9) {
        return document.basalForm.weightCategory.value = "Overweight";
    } else if (bmi > 18.5) {
        return document.basalForm.weightCategory.value = "Normal healthy";
    } else {
        return document.basalForm.weightCategory.value = "Underweight";
    };

};

function eat() {
    var pal = document.basalForm.pal.value;
    var palx = parseInt(pal, 10);
    console.log(palx);
    var basal = document.basalForm.basal.value;
    var basalx = parseInt(basal, 10);
    var calLose = palx - basalx;
    return document.basalForm.calLose.value = "- " + calLose + " Kcals";
}
!
999px

Console