When it comes to measuring the size of cabinet handles or knobs, it's important to get it right to ensure they fit properly. The first step is to measure the distance between the center of one screw hole to the center of another on your existing hardware. This measurement is called the 'center-to-center' measurement and will help you find a replacement with the same spacing. If you're starting from scratch, measure the thickness of your cabinet or drawer front and choose a handle or knob that accommodates that thickness. It's also helpful to consider the overall size and style of your cabinets when selecting hardware. Taking a little extra time to measure correctly can save you from frustration and disappointment down the line.