If you just came across the two words **Solidworks** and **equation** put together, it might sound a little strange. Let’s use this post to look deeper into how to use equations in Solidworks.

In Solidworks,** Equation** Creates mathematical relations between model dimensions or other model properties. They use dimension or property names as variables

Let’s take a look at how we can use equation tool in SolidWorks.

## Solidworks equation

### Step 1

First Create a New Part

### Step 2

Click on the Top plane and create a sketch

### Step 3

Make a Circle with the origin of the circle at the origin of the sketch.

### Step 4

Now, use **Smart Dimension** and give 120 mm to the circle but do not click on okay.

### Step 5

Remove figure and write =”A1”, click on Global Variable and click on okay. You can write

You can write a different name. As you can see, the equation sign appears next to the dimension.

### Step 6

Now click on **Extrude** and give 10 mm of thickness to circle.

### Step 7

Create another circle with the origin of the circle at the origin of the sketch.

### Step 8

The second circle dimension is one-quarter of first. To do this as an equation write =”A1”/4. As you know we have A1 as a dimension of the first circle. So, after this by changing the dimension of the first circle the second circle dimension will change automatically.

### Step 9

Use extrude to create a hole.

And you have it!

Hope this has been explicit enough for you to stop looking this SolidWorks feature as a hard one to take advantage of. Know that this can be used to include a lot more complex mathematical functions, File properties and much more.