1200 × 1500 Aspect Ratio: Is It 4:5, and How Do You Resize It?

The aspect ratio of a 1200 × 1500 image is 4:5. Divide both dimensions by 300: 1200 ÷ 300 = 4 and 1500 ÷ 300 = 5.

That result describes the image's shape, not its size. A 1200 × 1500 image and an 800 × 1000 image have the same 4:5 shape because their width-to-height proportions match. This guide explains how to calculate other 4:5 dimensions and how to change an image's size without stretching it.

Simplify 1200 × 1500 step by step

An aspect ratio compares width to height. To simplify one, divide both numbers by their greatest common divisor: the largest whole number that divides evenly into each dimension.

For 1200 and 1500, that number is 300:

1200 : 1500
 ÷300  ÷300
   4 : 5

So the image is portrait-oriented: it is taller than it is wide. Writing the dimensions in the opposite order would describe a different shape: 1500 × 1200 simplifies to 5:4 and is landscape-oriented. Keep the width-first order when comparing image requirements.

Calculate another 4:5 size

Every 4:5 size can be written as 4k × 5k, where k is the same multiplier for both dimensions. Some common whole-pixel examples are:

Width × height	Ratio	Relationship to 1200 × 1500
400 × 500	4:5	One-third of each dimension
800 × 1000	4:5	Two-thirds of each dimension
1080 × 1350	4:5	Same shape, different pixel count
1200 × 1500	4:5	Original dimensions
1600 × 2000	4:5	Four-thirds of each dimension

If you know only one target dimension, use the ratio as a fraction:

• To find the height from a width, multiply the width by 5 ÷ 4.
• To find the width from a height, multiply the height by 4 ÷ 5.

For example, a 4:5 image that is 1080 pixels wide should be 1080 × 5 ÷ 4 = 1350 pixels high. If the target height is 2000 pixels, the matching width is 2000 × 4 ÷ 5 = 1600 pixels.

When a calculation produces a fraction of a pixel, round deliberately and then check the resulting ratio. For example, a target width of 1001 pixels produces a mathematical height of 1251.25 pixels. An image file needs whole-pixel dimensions, so choose a nearby pair based on the destination's requirements rather than assuming every width can produce an exact 4:5 integer pair.

Resize, crop, or add padding: choose the operation that preserves what matters

The right approach depends on whether the original image already has the target shape.

Resize when the source is already 4:5

If the source is 1200 × 1500 and the target is 800 × 1000, resize both dimensions by the same scale factor. Here the factor is 2 ÷ 3:

1200 × 2 ÷ 3 = 800
1500 × 2 ÷ 3 = 1000

The result stays 4:5, so circles remain circular and people do not appear stretched. Reducing dimensions generally leaves fewer pixels; enlarging creates a larger pixel grid but cannot restore detail that was not in the original file.

Crop when the target must fill a different shape

Cropping removes pixels from one or more edges. It is appropriate when the target needs to be filled and losing edge content is acceptable. Decide which part of the image must remain visible before cropping—such as a person's face, product, label, or text—and keep that area inside the crop.

For example, cropping a 1200 × 1500 image to a square requires removing height or width until the dimensions match. A centered square crop could be 1200 × 1200, which removes 300 pixels of total height. Whether that is acceptable depends on the composition; an important element near the top or bottom may require moving the crop rather than centering it.

Add padding when every source pixel must remain

Padding, sometimes called letterboxing or pillarboxing, puts empty or coloured space around an image so it fits a different canvas without distortion or cropping. This preserves the whole image but changes the final composition. Choose a background that supports the destination and does not make text or important edges hard to read.

For a 1200 × 1500 source placed on a 1500 × 1500 square canvas, scale it only if needed, then add equal left and right padding to fill the extra width. The visible image remains 4:5; the canvas is square.

Avoid the common stretching mistake

Stretching occurs when width and height are changed by different scale factors. Changing 1200 × 1500 to 1200 × 1200 keeps the width but reduces the height, changing the shape from 4:5 to 1:1. A circle in the original would become an oval.

Before exporting, divide the target width by target height and compare it with 4 ÷ 5, or simplify the two dimensions. If the target is not 4:5, use cropping or padding if you need to preserve natural-looking proportions. A display layout can also reserve a proportional box with CSS; a CSS aspect-ratio setting affects layout sizing, but it does not resample or crop the image file itself.

A quick 1200 × 1500 checklist

1. Confirm that the first number is width and the second is height.
2. Simplify 1200:1500 to 4:5 by dividing both numbers by 300.
3. For a new 4:5 size, multiply both parts of the ratio by the same value.
4. If the target has another ratio, choose explicitly between crop, padding, or a different layout.
5. Check the exported pixel dimensions before sharing or uploading the image.

For a quick way to reduce a width-to-height pair, use the yukt.tools ratio tool. The result tells you the shape; check the receiving service's current image-size rules separately before choosing final pixel dimensions.

Frequently asked questions

What ratio is 1200 by 1500?

1200 by 1500 is 4:5. Both numbers divide evenly by 300, leaving 4 and 5. The order matters: 1200 × 1500 is a portrait-oriented 4:5 image, while 1500 × 1200 is a landscape-oriented 5:4 image. They contain the same two values but do not have the same orientation.

Is 1200 × 1500 the same shape as 1080 × 1350?

Yes. 1080 × 1350 also simplifies to 4:5 because both values divide by 270. The files have different pixel dimensions and therefore different total pixel counts, but their proportional shape is the same. Resizing between those pairs without distortion requires applying one equal scale factor to both dimensions.

How do I make a 1200 × 1500 image square without stretching it?

Use a crop or add padding; do not independently force both dimensions to 1200. A 1200 × 1200 crop removes 300 pixels of total height, while a 1500 × 1500 canvas can preserve the full image with added left and right padding. The better choice depends on whether retaining every edge of the original matters more than filling the square.

Does changing an image's pixel size change its aspect ratio?

Not when both dimensions use the same scale factor. Reducing 1200 × 1500 to 600 × 750 halves each dimension and keeps the 4:5 ratio. Changing only one dimension, or scaling width and height by different amounts, changes the ratio and can visibly distort the image unless cropping or padding is used instead.