Hardware Conversion Calculator
Enter your center-to-center measurement in inches to find the exact millimeter (mm) requirement for your hardware.
True Metric Size:
0 mm
How to Use the Calculator
To get your exact metric hardware size, grab your tape measure and follow these simple steps:
- MEASURE YOUR HARDWARE: Find the distance from the dead-center of the left screw hole to the dead-center of the right screw hole. Never measure from the outside edges.
- CONVERT FRACTIONS TO DECIMALS: US tape measures read in fractions, but the calculator needs a decimal. Convert your measurement before entering it (e.g., 3-3/4″ becomes 3.75, 5-1/16″ becomes 5.06).
- ENTER YOUR INCHES: Plug that exact decimal number into the calculator input box.
Understanding Your Results: Once you click Convert to mm, the calculator will instantly reveal your True Metric Size. This is the exact millimeter measurement you need to look for when shopping for replacement hardware online or setting up your drilling jig. Note: Manufacturers often round the final metric number slightly. For example, 3.75 inches mathematically converts to 95.3 mm, but you will round up to buy the industry standard 96 mm size.
Introduction
Most cabinet hardware sold in the US is labeled in rough inches, but manufactured in exact metric millimeters (mm).
Use this calculator to convert your fractional tape measurements into the exact metric millimeters required to buy replacement hardware that fits your existing drill holes.
How do you convert cabinet hardware from inches to millimeters?
To convert your center-to-center cabinet hardware measurement from inches to millimeters, multiply your inch measurement by 25.4. For example, a 3.75-inch pull multiplied by 25.4 equals 95.25 mm. Because manufacturers round to standard metric sizes, you will round this number up to buy a 96 mm replacement pull.
To skip the manual math and reduce the risk of ordering the wrong size, simply plug your measurements into the calculator above.
Frequently Asked Questions
Q. Why is cabinet hardware measured in millimeters?
A. Most cabinet hardware is manufactured overseas, where the metric system is the universal standard. US retailers often convert these clean metric sizes into imperial inches for American consumers, which leads to confusing, clunky fractional measurements like 3-3/4″ instead of a clean 96 mm.
Q. What is the most common cabinet pull size in mm?
A. The most common standard size for kitchen cabinet pulls is 96 mm (which is usually labeled in US stores as 3.75 inches or 3-3/4″). Other incredibly common metric hardware sizes include 128 mm (5 inches) and 160 mm (6.3 inches).
Q. How precise do I need to be when measuring for replacement pulls?
A. You must be 100% exact. If you are replacing existing pulls without using wood filler to redrill the holes, your new hardware’s center-to-center measurement must match your old holes perfectly. Even a 2 mm difference will prevent the cabinet screws from threading in straight.
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