2:3 Aspect Ratio Calculator

A 2:3 frame is two units wide for every three units tall, a decimal value of about 0.667. It is the exact inverse of 3:2, so rotating a 3:2 landscape photograph ninety degrees gives a 2:3 portrait photograph without cropping.

That relationship matters in practice. Because most camera sensors are natively 3:2, shooting a portrait without turning anything in the menu produces a full-sensor 2:3 file at maximum resolution. Switching to a taller on-screen ratio such as 4:5 or 9:16 crops the sensor output and throws pixels away before you have even downloaded the card.

The arithmetic is the same two-step routine as 3:2, applied to the other dimension first because the width is now the smaller number.

1. Divide the height by 3.
2. Multiply that result by 2 to get the width.
3. Round to a whole pixel — camera sensors typically round up, which is why portrait outputs 12 megapixels are 2667 wide rather than 2666.

Worked example

From a height of 4000 pixels: 4000 ÷ 3 = 1333.33, and 1333.33 × 2 = 2666.67, which sensors record as 2667. That gives the 2667 × 4000 portrait frame. From 6000 pixels tall: 6000 ÷ 3 = 2000 and 2000 × 2 = 4000, producing 4000 × 6000. If you only know the width, reverse it: 2000 × 3 ÷ 2 = 3000.

Beyond mixing it up with its landscape counterpart 3:2, people often assume all book covers and prints use exactly 2:3 — trade paperback and print sizes vary by publisher and region, so 2:3 is a common target rather than a universal standard. When formatting for print, always confirm the exact trim size rather than assuming 2:3 is a safe default.

For a standard tall Pin at 1000 pixels wide: 1000 ÷ 2 = 500, then 500 × 3 = 1500. That gives 1000 × 1500, the vertical size Pinterest recommends for a standard Pin, and the tallest shape the main feed will show without cutting the bottom off.

Type your own numbers into the 2:3 calculator above and it will show the same division, plus the reduced ratio and the CSS to copy.

• Vertically oriented camera photographs from 3:2 sensors.
• Portrait book covers and paperback jacket artwork.
• Posters and bookmarks at the traditional 1:1.5 print proportion.
• Mobile-first web cards for articles and recipes.
• Portfolio and gallery grids that need a consistent tall tile.
• Packaging and label layouts where the item is taller than it is wide.

2:3 is the portrait twin of 3:2 and sits between the square and phone-screen formats. The 3:2 calculator covers the landscape orientation it comes from, the 4:5 calculator covers the Instagram portrait format, and the 1:1 calculator covers square output.

• 16:9
• 9:16
• 4:3
• 1:1
• 16:10
• 21:9
• 3:2
• 4:5
• 2.39:1

This 2:3 guide is one of ten ratio calculators on the site — the common aspect ratios table lists the decimal value and the typical uses for every one of them.

Add a free, live aspect ratio calculator to any page in one line of code - no account, no API key, no ads. Every embed credits the tool with a Powered by AspectCalc link, so your readers always know where it came from. See the full embedding guide for height and styling options.

<div class="aspectcalc-embed" style="max-width:100%">
  <iframe id="aspectcalc-frame" src="https://aspectcalc.com/embed?h=640"
          width="100%" height="700" style="border:0;border-radius:12px"
          loading="lazy" title="AspectCalc aspect ratio calculator"></iframe>
  <p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif;color:#64748b;text-align:center">Powered by <a href="https://aspectcalc.com/" style="color:#2563eb;text-decoration:none">AspectCalc</a> - free aspect ratio calculator</p>
</div>
<script>
  // Optional: grow the frame to the widget's real height.
  // Delete this whole block to keep a fixed-height frame instead.
  addEventListener('message', function (e) {
    if (e.origin !== 'https://aspectcalc.com') return;
    if (!e.data || e.data.type !== 'aspectcalc-height') return;
    var f = document.getElementById('aspectcalc-frame');
    if (f) f.style.height = e.data.height + 'px';
  });
</script>

The frame starts at a fixed height, so your layout never jumps. Resize it with ?h= - for example https://aspectcalc.com/embed?h=520 - or keep the small script in the snippet and the frame will follow the widget's real height instead.