Rivet Size Calculator

A rule of thumb for selecting blind-rivet diameter and length.

How the Math Works

The Rivet Size Calculator uses two straightforward formulas to determine the proper rivet dimensions. First, the rivet diameter is calculated by multiplying the material thickness by three (diameter ≈ 3 × thickness). Second, the rivet length is found by adding the material thickness to 1.5 times the calculated diameter (length ≈ thickness + 1.5 × diameter). These approximations ensure the rivet will properly grip and secure the material without being too loose or overly tight.

Practical Applications

To use this calculator practically, first measure the total thickness of the material(s) you need to join. Enter this measurement into the calculator, which will instantly provide the recommended rivet diameter and length. For example, if joining materials that are 0.1 inches thick, the calculator would determine a diameter of approximately 0.3 inches and a length of 0.75 inches (0.1 + 1.5 × 0.3). You can then select the closest standard rivet size available at your hardware store or order custom rivets if needed.

Day-to-Day Use

This calculator simplifies everyday tasks involving metal fastening, whether you're installing automotive trim, building furniture, repairing equipment, or crafting DIY projects. Instead of guessing which rivet size to purchase, you can quickly determine the exact specifications needed for a secure, professional-quality connection. This saves time at the hardware store, prevents project delays from having the wrong size on hand, and ensures your repairs and constructions are both durable and properly fitted.

Worked example

3 mm sheet → ~9 mm diameter, 16.5 mm length.

FAQ