While there are many different size ratios used for modeling, here is a shortlist of the most popularly used model scale sizes and what they are most commonly used for:

• 1:4 – Flying models and steam trains
• 1:8 – Cars, motorcycles, and steam trains
• 1:12 – Cars, motorcycles, and figurines
1:16 – Cars, motorcycles, and armor
1:20 – Cars
1:22.5 – G scale trains
1:24 – Cars, trucks, and large-scale planes
1:25 – Cars and trucks