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CSS

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HTML 

              
                h1 Website Calculation Tool
p
  span.en(lang="en") A calculation tool useful for web design and website creation.
p
  span.en(lang="en")
    | The metallic means and aspect ratio is calculated based on the input value entered in "Standard pixel".
    br
    | "%, vw, vh, em, rem" is calculated by inputting the standard pixel and the pixel to calculate.
h2 Numeric input
div
  | Standard pixel
  br
  input#num1(type="number" value="0" onchange="Calculation()")
div
  | Pixel to calculate
  br
  input#num2(type="number" step="0.001" value="0" onchange="Calculation()")
h2 Calculation result
div
  input#result1(type="text" value="0" readonly="readonly")
  |  %, vw, vh
div
  input#result2(type="text" value="0" readonly="readonly")
  |  em, rem
h2 Width and height calculation results
select#changeWidthHeight(onchange="changeWidthHeight()")
  option(value="w", selected="") Width
  option(value="h") Height
h3 Metallic means
div
  | Golden ratio
  input#goldenRetio(type="text" value="0" readonly="readonly")
  |  px
div
  | Silver ratio
  input#silverRetio(type="text" value="0" readonly="readonly")
  |  px
div
  | Bronze ratio
  input#bronzeRetio(type="text" value="0" readonly="readonly")
  |  px
h3 Aspect ratio
div
  span 4:3
  input#sdRetio(type="text" value="0" readonly="readonly")
  |  px
div
  span 3:2
  input#threeToTwoRetio(type="text" value="0" readonly="readonly")
  |  px
div
  | L size
  input#lSizeRetio(type="text" value="0" readonly="readonly")
  |  px
div
  span 16:9
  input#hdRetio(type="text" value="0" readonly="readonly")
  |  px
div
  span 16:10
  input#sixteenToTenRetio(type="text" value="0" readonly="readonly")
  |  px
div
  span 21:9
  input#twentyOneByNineRetio(type="text" value="0" readonly="readonly")
  |  px
div
  | OGP image
  br
  | * Please produce with a width of 1200px and a height of 630px or more.
  br
  input#ogpImageRetio(type="text" value="0" readonly="readonly")
  |  px
p
  a(href='https://www.eu-create.net/apps/web-calc/', target='_blank', rel='noopener noreferrer') Full version is here
p#copyright
  small 2019 &copy EU-Create. All rights reserved.
!

CSS 

              
                $baseColor: #004d84
h1
  border-bottom: solid 3px $baseColor
h2, h3
  padding: .25em .5em
  background-color: $baseColor
  color: #fff
  border-radius: 5px
!

JS 

              
                var elemChangeWidthHeight = document.getElementById('changeWidthHeight');
var elemNum1 = document.getElementById('num1');
var elemGoldenRetio = document.getElementById('goldenRetio');
var elemSilverRetio = document.getElementById('silverRetio');
var elemBronzeRetio = document.getElementById('bronzeRetio');
var elemSdRetio = document.getElementById('sdRetio');
var elemThreeToTwoRetio = document.getElementById('threeToTwoRetio');
var elemLSizeRetio = document.getElementById('lSizeRetio');
var elemHdRetio = document.getElementById('hdRetio');
var elemSixteenToTenRetio = document.getElementById('sixteenToTenRetio');
var elemTwentyOneByNineRetio = document.getElementById('twentyOneByNineRetio');
var elemOgpImageRetio = document.getElementById('ogpImageRetio');

function Calculation(){
  var num1 = parseFloat(elemNum1.value);
  var num2 = parseFloat(document.getElementById('num2').value);
  document.getElementById('result1').value = num2 / num1 * 100;
  document.getElementById('result2').value = num2 / num1;
  elemGoldenRetio.value = num1 * ((1 + Math.sqrt(5)) / 2);
  elemSilverRetio.value = num1 * Math.SQRT2;
  elemBronzeRetio.value = num1 * ((3 + Math.sqrt(13)) / 2);
  elemSdRetio.value = num1 / (3 / 4);
  elemThreeToTwoRetio.value = num1 / (3 / 2);
  elemLSizeRetio.value = num1 / (89 / 127);
  elemHdRetio.value = num1 / (9 / 16);
  elemSixteenToTenRetio.value = num1 / (5 / 8);
  elemTwentyOneByNineRetio.value = num1 / (9 / 21);
  elemOgpImageRetio.value = num1 * (120 / 63);
}

function changeWidthHeight(){
  var num1 = parseFloat(elemNum1.value);
  if (elemChangeWidthHeight.value === "h") {
    elemGoldenRetio.value = num1 / ((1 + Math.sqrt(5)) / 2);
    elemSilverRetio.value = num1 / Math.SQRT2;
    elemBronzeRetio.value = num1 / ((3 + Math.sqrt(13)) / 2);
    elemSdRetio.value = num1 * (3 / 4);
    elemThreeToTwoRetio.value = num1 * (2 / 3);
    elemLSizeRetio.value = num1 * (89 / 127);
    elemHdRetio.value = num1 * (9 / 16);
    elemSixteenToTenRetio.value = num1 * (5 / 8);
    elemTwentyOneByNineRetio.value = num1 * (9 / 21);
    elemOgpImageRetio.value = num1 / (120 / 63);
  } else {
    Calculation();
  }
}
!
999px

Console