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aspect-ratio-calculator.pug
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---
title: Aspect Ratio Calculator
---
h1 Aspect Ratio Calculator
p Multiple times per month I ask myself: what aspect ratio is this pixel amount? This is the tool that helps me know better.
p Use the form below to calculate the missing value for a particular aspect ratio. This is useful, for example, when resizing photos or video.
style(type='text/css' media='screen').
.aspectratio .calcWraper {
width: 100%;
display: flex;
align-items: center;
justify-content: center;
}
.aspectratio .calcWraper.calcLabel {
margin: 0;
}
.aspectratio .calcWraper.calcOldInput,
.aspectratio .calcWraper.calcNewInput {
width: calc(100% / 2 - 20px );
}
.aspectratio .calcOldWidth,
.aspectratio .calcNewWidth {
border-bottom: 2px solid black;
}
.aspectratio .calcBetween {
width: 20px;
text-align: center;
}
.aspectratio .calcWraper input {
border: 1px solid black;
background-color: #BDE5F8;
color: #101318;
font-size: 1rem;
padding: .5rem;
width: 100%;
}
.aspectratio .rounding {
text-align: center;
}
.aspectratio .rounding .checkboxInput {
padding: 0;
margin: 0;
vertical-align: baseline;
}
.aspectratio input.calculated {
background-color: #DFF2BF;
border-color: #4F8A10;
}
.aspectratio #ratioExampleBox {
display: flex;
background: gray;
margin: auto;
text-align: center;
vertical-align: middle;
}
.aspectratio #ratioExampleBox p {
margin: auto;
/* Important */
text-align: center;
}
.aspectratio #alert {
display: block;
width: 100%;
padding: 1rem;
color: #D8000C;
background-color: #FFD2D2;
border-color: #D8000C;
text-align: center;
}
.aspectratio #ratio {
overflow: hidden;
}
@media all and (min-width: 767px) {
.aspectratio .calcWraper .calcOldWidth,
.aspectratio .calcWraper .calcNewWidth,
.aspectratio .calcWraper .calcOldHeight,
.aspectratio .calcWraper .calcNewHeight {
display: flex;
justify-content: space-between;
padding-bottom: .5rem;
padding-top: .5rem;
align-items: center;
justify-content: center;
}
.aspectratio .calcWraper .calcLabel {
width: calc(100%/3*1.2);
text-align: right;
padding-right: .5rem;
}
.aspectratio .calcWraper .calcInput {
width: calc(100%/3*1.8);
}
}
.aspectratio.paragraph
.calcWraper
.calcOldInput
.calcOldWidth
label.calcLabel Old Width:
.calcInput: input#oldWidth.numberInput(name='oldWidth' tabindex='1' type='number' placeholder='Old Width' value='1920')
.calcOldHeight
label.calcLabel Old Height:
.calcInput: input#oldHeight.numberInput(name='oldHeight' tabindex='2' type='number' placeholder='Old Height' value='1080')
.calcBetween
| =
.calcNewInput
.calcNewWidth
label.calcLabel New Width:
.calcInput: input#newWidth.numberInput(name='newWidth' tabindex='3' type='number' placeholder='New Width' value='16')
.calcNewHeight
label.calcLabel New Height:
.calcInput: input#newHeight.numberInput(name='newHeight' tabindex='4' type='number' placeholder='New Height' value='9')
.rounding
input#roundResult.checkboxInput(name='roundResult' tabindex='5' type='checkbox' checked='true')
= ' '
| Round results to the nearest whole number
#alert(style='display: none;') The values entered are not valid.
#ratio(style='display: none;')
ul
li
| The aspect ratio (closest full fraction) is:
= ' '
span#aspectRatioFraction(style='font-weight: bold;')
li
| The aspect ratio (in decimals) is: 1:
= ' '
span#aspectRatioDecimals(style='font-weight: bold;')
li
| Pixel count (full):
= ' '
span#megaPixels(style='font-weight: bold;')
= ' '
| pixels
li
| Pixel count (round):
= ' '
span#megaPixelsMega(style='font-weight: bold;')
= ' '
| mega pixels
div
#ratioExampleBox: p
script(src="https://cdn.jsdelivr.net/npm/jquery@3.5/dist/jquery.min.js")
script(type="text/javascript").
const $ = jQuery
$(function () {
console.log('Aspect Ratio Calculator App');
const $alert = $('#alert')
$alert.hide(true)
const $ratio = $('#ratio')
$ratio.hide(true)
const $inputs = $('.numberInput')
const $oldWidth = $('#oldWidth')
const $oldHeight = $('#oldHeight')
const $newWidth = $('#newWidth')
const $newHeight = $('#newHeight')
const $aspectRatioDecimals = $('#aspectRatioDecimals')
const $aspectRatioFraction = $('#aspectRatioFraction')
const $ratioExampleBox = $('#ratioExampleBox')
const $roundResult = $('#roundResult')
const $megaPixels = $('#megaPixels')
const $megaPixelsMega = $('#megaPixelsMega')
let calculate = 'height'
function calcStuff () {
let aspectRatio = 0
switch ($(this).attr('id')) {
case 'oldWidth':
break;
case 'oldHeight':
break;
case 'newWidth':
calculate = 'height'
break;
case 'newHeight':
calculate = 'width'
break;
default:
// statements_def
break;
}
let oldWidth = $oldWidth.val()
let oldHeight = $oldHeight.val()
let newWidth = $newWidth.val()
let newHeight = $newHeight.val()
const roundResult = $roundResult.is(":checked")
if (parseFloat(oldWidth) && parseFloat(oldHeight) && ((calculate === 'height' && parseFloat(newWidth)) || (calculate === 'width' && parseFloat(newHeight)))) {
$alert.hide()
$ratio.show()
$ratioExampleBox.css('height', '150px')
// let aspectRatio = (oldWidth > oldHeight) ? (oldWidth / oldHeight) : (oldHeight / oldWidth)
let aspectRatio = (oldWidth / oldHeight)
if (calculate === 'height') {
newHeight = newWidth / aspectRatio
$newWidth.removeClass('calculated')
$newHeight.addClass('calculated')
if (roundResult) newHeight = Math.round(newHeight)
$newHeight.val(newHeight)
} else {
newWidth = newHeight * aspectRatio
$newWidth.addClass('calculated')
$newHeight.removeClass('calculated')
if (roundResult) newWidth = Math.round(newWidth)
$newWidth.val(newWidth)
}
if (oldHeight > oldWidth)
$ratioExampleBox.css('width', parseFloat($ratioExampleBox.css('height')) / aspectRatio + 'px')
else
$ratioExampleBox.css('width', parseFloat($ratioExampleBox.css('height')) * aspectRatio + 'px')
// let fraction = aspectRatio;
// let len = fraction.toString().length - 2;
// let denominator = Math.pow(10, len);
// let numerator = fraction * denominator;
// let divisor = gcd(numerator, denominator); // Should be 5
let denominator = oldWidth
let numerator = oldHeight
let divisor = gcd(numerator, denominator); // Should be 5
numerator /= divisor; // Should be 687
denominator /= divisor; // Should be 2000
let aspectRatioFraction = Math.floor(denominator) + '/' + Math.floor(numerator)
$ratioExampleBox.find('p').text(aspectRatioFraction)
$aspectRatioDecimals.text(aspectRatio)
$aspectRatioFraction.text(aspectRatioFraction)
$megaPixels.text((oldWidth*oldHeight).toLocaleString())
$megaPixelsMega.text(Math.round(oldWidth*oldHeight/10000)/100).toLocaleString()
} else {
$alert.show()
$ratio.hide()
}
}
const gcd = function(a, b) {
if (b < 0.01) return a; // Since there is a limited precision we need to limit the value.
return gcd(b, Math.floor(a % b)); // Discard any fractions due to limitations in precision.
}
$inputs.on('change paste keyup', calcStuff)
$roundResult.on('change paste keyup', calcStuff)
calcStuff()
function myCalc(oldWidth, oldHeight) {
let aspectRatio = (oldWidth / oldHeight)
let denominator = oldWidth
let numerator = oldHeight
let divisor = gcd(numerator, denominator); // Should be 5
numerator /= divisor; // Should be 687
denominator /= divisor; // Should be 2000
let aspectRatioFraction = Math.floor(denominator) + '/' + Math.floor(numerator)
console.log('width: ', oldWidth);
console.log('height: ', oldHeight);
console.log('fraction: ', aspectRatioFraction);
console.log('ratio: ', aspectRatio.toFixed(3));
}
});
h2 Explanation / Instructions
ol
li Enter your values into <code>Old Width</code> and <code>Old Height</code>respectively.
li Enter one of the values of <code>New Width</code> or <code>New Height</code>.
li The missing value will be calculated automatically.
li You can change all values at any time, the calculation updated automatically.
h2 Formula
p You have a photo or video that is 2400 x 3000 pixels in resolution, but you'd like to send a file that is only 400px in width to your client for review. To calculate the new height of your photo you can use the following formula (or the calculator above):
pre: code (org. height / org. width) x new width = new height
p With the example numbers above, this would be the calculation:
pre: code (2400 / 3000) x 400 = 320
h2 Resolutions & Aspect Ratios for Social Media
h3 Instagram
p You should always check and be aware of the fact, that on your Instagram Feed, people will only see the center square (1:1) part of the photo post, video post, and IGTV upload.
.tbl-resp(role='table' aria-label='Destinations')
.flex-table.header(role='rowgroup')
.flex-row.first(role='columnheader') Group
.flex-row(role='columnheader') Name
.flex-row(role='columnheader') Aspect Ratio
.flex-row(role='columnheader') Width
.flex-row(role='columnheader') Height
.flex-table.row(role='rowgroup')
.flex-row.rowspan.first Photo Post
.column
.flex-row(role='rowgroup')
.flex-cell(role='cell') Portrait
.flex-cell(role='cell') 4:5
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1350px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Square
.flex-cell(role='cell') 1:1
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1080px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Landscape
.flex-cell(role='cell') 1.91:1
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 608px
.flex-table.row(role='rowgroup')
.flex-row.rowspan.first Video Post
.column
.flex-row(role='rowgroup')
.flex-cell(role='cell') Portrait
.flex-cell(role='cell') 4:5
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1350px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Square
.flex-cell(role='cell') 1:1
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1080px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Landscape
.flex-cell(role='cell') 1.91:1
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 608px
.flex-table.row(role='rowgroup')
.flex-row.rowspan.first Story Post
.column
.flex-row(role='rowgroup')
.flex-cell(role='cell') Portrait
.flex-cell(role='cell') 9:16
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1920px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Landscape
.flex-cell(role='cell') 1.91:1
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 608px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Live
.flex-cell(role='cell') 9:16
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1920px
.flex-table.row(role='rowgroup')
.flex-row.rowspan.first IGTV
.column
.flex-row(role='rowgroup')
.flex-cell(role='cell') Portrait
.flex-cell(role='cell') 9:16
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1920px
.flex-row(role='rowgroup')
.flex-cell(role='cell') Landscape
.flex-cell(role='cell') 16:9
.flex-cell(role='cell') 1920px
.flex-cell(role='cell') 1080px
.flex-row(role='rowgroup')
.flex-cell(role='cell') IGTV Cover
.flex-cell(role='cell') 4:5
.flex-cell(role='cell') 1080px
.flex-cell(role='cell') 1350px
.flex-table.row(role='rowgroup')
.flex-row.rowspan.first Other
.column
.flex-row(role='rowgroup')
.flex-cell(role='cell') Profile Photo
.flex-cell(role='cell') 1:1
.flex-cell(role='cell') 180px
.flex-cell(role='cell') 180px
h2 Resolutions & Aspect Ratios for Filmmaking
.tbl-resolutions(role='table' aria-label='Destinations')
.flex-table.header(role='rowgroup')
.flex-row.first(role='columnheader') Name
.flex-row(role='columnheader') Width
.flex-row(role='columnheader') Height
.flex-row(role='columnheader') Aspect Ratio (convention)
.flex-row(role='columnheader') Aspect Ratio (decimal)
.flex-row(role='columnheader') Pixels
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') NTSC
.flex-row(role='cell') 640px
.flex-row(role='cell') 480px
.flex-row(role='cell') 4/3
.flex-row(role='cell') 1.333
.flex-row(role='cell') 307,200
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') DV NTSC
.flex-row(role='cell') 720px
.flex-row(role='cell') 480px
.flex-row(role='cell') 3/2
.flex-row(role='cell') 1.500
.flex-row(role='cell') 345,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') DV PAL
.flex-row(role='cell') 720px
.flex-row(role='cell') 576px
.flex-row(role='cell') 5/4
.flex-row(role='cell') 1.250
.flex-row(role='cell') 414,720
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') HDTV 720
.flex-row(role='cell') 1280px
.flex-row(role='cell') 720px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 921,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') HDV 720
.flex-row(role='cell') 1280px
.flex-row(role='cell') 720px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 921,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') HDTV 1080
.flex-row(role='cell') 1920px
.flex-row(role='cell') 1080px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 2,073,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') HDV 1080
.flex-row(role='cell') 1440px
.flex-row(role='cell') 1080px
.flex-row(role='cell') 4/3
.flex-row(role='cell') 1.333
.flex-row(role='cell') 1,555,200
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') UltraWide FHD
.flex-row(role='cell') 2560px
.flex-row(role='cell') 1080px
.flex-row(role='cell') 21∶9
.flex-row(role='cell') 2.333
.flex-row(role='cell') 2,764,800
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 2K Academy
.flex-row(role='cell') 1828px
.flex-row(role='cell') 1332px
.flex-row(role='cell') 457/333
.flex-row(role='cell') 1.372
.flex-row(role='cell') 2,434,896
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 2K Full Aperture
.flex-row(role='cell') 2048px
.flex-row(role='cell') 1536px
.flex-row(role='cell') 4/3
.flex-row(role='cell') 1.333
.flex-row(role='cell') 3,145,728
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') DCI 2K (full frame)
.flex-row(role='cell') 2048px
.flex-row(role='cell') 1080px
.flex-row(role='cell') 1.90/1
.flex-row(role='cell') 1.90
.flex-row(role='cell') 2,211,840
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 4K UHD-1
.flex-row(role='cell') 3840px
.flex-row(role='cell') 2160px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 8,294,400
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 4K Academy
.flex-row(role='cell') 3656px
.flex-row(role='cell') 2664px
.flex-row(role='cell') 457/333
.flex-row(role='cell') 1.372
.flex-row(role='cell') 9,739,584
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') DCI 4K (full frame)
.flex-row(role='cell') 4096px
.flex-row(role='cell') 2160px
.flex-row(role='cell') 1.90/1
.flex-row(role='cell') 1.90
.flex-row(role='cell') 8,847,360
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 4K Full Aperture
.flex-row(role='cell') 4096px
.flex-row(role='cell') 3072px
.flex-row(role='cell') 4/3
.flex-row(role='cell') 1.333
.flex-row(role='cell') 12,582,912
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') Ultra-Wide QHD
.flex-row(role='cell') 3440px
.flex-row(role='cell') 1440px
.flex-row(role='cell') 21∶9
.flex-row(role='cell') 2.333
.flex-row(role='cell') 4,953,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') WQUXGA
.flex-row(role='cell') 3840px
.flex-row(role='cell') 2400px
.flex-row(role='cell') 16/10
.flex-row(role='cell') 1.60
.flex-row(role='cell') 9,216,000
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') Ultra-Wide 4K
.flex-row(role='cell') 3840px
.flex-row(role='cell') 1600px
.flex-row(role='cell') 21∶9
.flex-row(role='cell') 2.333
.flex-row(role='cell') 6,144,000
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 5K
.flex-row(role='cell') 5120px
.flex-row(role='cell') 2880px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 14,745,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') Ultra-Wide 5K
.flex-row(role='cell') 5120px
.flex-row(role='cell') 2160px
.flex-row(role='cell') 21∶9
.flex-row(role='cell') 2.333
.flex-row(role='cell') 11,059,200
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 6K
.flex-row(role='cell') 6144px
.flex-row(role='cell') 3160px
.flex-row(role='cell')
.flex-row(role='cell') 1.94
.flex-row(role='cell') 19,415,040
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 8K UHD-2
.flex-row(role='cell') 7680px
.flex-row(role='cell') 4320px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 33,177,600
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') DCI 8K (8K Full Format)
.flex-row(role='cell') 8192px
.flex-row(role='cell') 4320px
.flex-row(role='cell') 1.90/1
.flex-row(role='cell') 1.90
.flex-row(role='cell') 35,389,440
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') Ultra-Wide 10K
.flex-row(role='cell') 10240px
.flex-row(role='cell') 4320px
.flex-row(role='cell') 21∶9
.flex-row(role='cell') 2.333
.flex-row(role='cell') 44,236,800
.flex-table.row(role='rowgroup')
.flex-row.first(role='cell') 16K
.flex-row(role='cell') 15360px
.flex-row(role='cell') 8640px
.flex-row(role='cell') 16/9
.flex-row(role='cell') 1.777
.flex-row(role='cell') 132,710,400
p.text-center A list of more common resolutions can be found on #[a(href='https://en.wikipedia.org/wiki/List_of_common_resolutions') WikiPedia].
div.content.feedback
p Any issues? Email me #[a(href='mailto:team@ChrisSpiegl.com?subject=Aspect Ratio Calculator Problem') team@ChrisSpiegl.com].
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