How do I know what size door hinges to buy?

When determining the size of door hinges to buy, you need to consider a few important factors. Here are the key steps to help you determine the appropriate size:

1. Identify the Door Thickness: Measure the thickness of your door using a tape measure. Common door thicknesses are typically 1 3/8 inches (35 mm) for interior doors and 1 3/4 inches (44 mm) for exterior doors. Knowing the door thickness is crucial because it affects the size and length of the hinge leaf (the part of the hinge attached to the door).

2. Determine the Door Weight: The weight of the door is a critical factor in selecting the appropriate size and strength of the hinges. Heavier doors require hinges that can support their weight without causing strain or sagging. If you are unsure about the weight of the door, consult a professional or use a bathroom scale to get an estimate.

3. Consider the Door Material: The material of the door can impact the type of hinges you need. For example, solid wood doors may require heavier-duty hinges compared to hollow core doors. The door material can also affect the number of hinges needed. Heavier doors often require more than two hinges to provide adequate support and stability.

4. Determine the Required Hinge Size: Based on the door thickness, weight, and material, you can determine the appropriate hinge size. Hinges are typically labeled with sizes, such as 3 inches, 3.5 inches, 4 inches, etc. This measurement refers to the length of the hinge leaf.

- For interior doors, a common choice is 3.5-inch hinges.

- For exterior doors or heavier doors, you may need to consider 4-inch or longer hinges.

5. Consider the Hinge Type: Besides size, you should also consider the type of hinge suitable for your door. Common hinge types include butt hinges, continuous/piano hinges, and concealed hinges. The choice depends on factors such as the door style, desired appearance, and installation requirements.

It's recommended to consult with a hardware professional or refer to manufacturer guidelines to ensure you select the correct size and type of hinges for your specific door. They can provide further guidance based on your door's unique characteristics and your specific needs.