A typical under counter dishwasher width is about 24 to 26 inches wide. However, the slim dishwashers can be as narrow as 20 inches!
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How to measure dishwasher opening
Here’s how you measure your counter opening before buying a dishwasher. Doing this stage right will ensure you get the perfect fitting appliance for you.

The first step would be to locate where you want to place the dishwasher in the kitchen. Once you’ve done that, measure the width by using a tape measure going from left to right. Keep a note of how much the width is in inches.
Next, do the same again but from top to bottom measuring the height, and again for the depth. You should have all three measurements noted down by now. This will allow you to start searching for the perfect dishwasher. Taking into consideration the largest measurements for it to fit the opening.
In general, a regular under-the-counter standard dishwasher will fit a standard 24″ or 25 1/2″ opening with no problem.
Always remember when looking for a dishwasher that it is a little smaller than the empty opening. Also take note that the manufacturers usually roundup dimensions for each appliance.
Dishwashers usually come with adjustable feet so also always take this into account. The adjustable feet make it easier to keep the dishwasher level even if the floor is not. This will help to ensure that there are no water leakages during use.
Are all dishwashers 24 inches wide and how wide is a dishwasher opening?
Yep, most under-counter dishwashers width are 24 inches wide. Other dishwashers such as countertop options vary in sizes from 16 to 22 inches wide.
There are many different types of dishwashers, click here for a full guide.
Standard Dishwasher Size Guides:
Here is three different size guides for dishwasher dimensions. We cover standard, compact and portable dishwasher size dimensions. This will make it easier for you when selecting a new dishwasher for your home.
Under-counter standard dishwasher size guide:

Compact slim dishwasher size guide:

Portable/countertop dishwasher size guide:

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