The scale indicates the size of the diecast car. So when talking about the 1/18 scale, it means that one centimeter on the diecast Minichamps is 18 centimeters in reality. To give you an idea Minichamps diecast 1/18 scale measuring between 25 and 30 centimeters depending on the model and Minichamps diecast 1/43 scale measuring about 10 centimeters. More scale is the higher more the car will be small. The links below allow you to filter your search by Minichamps diecast scale.
1/12     
1/18     
1/43     
1/64     
1/87