1:25 Scale Calculator & Conversion Chart
American car kit scale · 4% of real size
1:25 is the traditional American car modeling scale — AMT, Revell USA, and MPC standardized on it decades ago, while most of the world builds 1:24. The 4% size difference is invisible on a shelf, but matters when you swap wheels or engines between kits. It is also the classic American architectural scale (1/2″ = 1 foot… almost).
Precision Scale Conversion Calculator
1:25 Scale Quick Facts
- 1 real foot = 0.48″ (12.19 mm) on the model
- 1 real meter = 40 mm on the model
- A 6 ft (183 cm) person = 73.2 mm (2.88″) tall
- Model is 4% of real size — use this as the scale percentage in 3D-print slicers
1:25 Scale Reference Chart
| Real Size | mm | cm | inches |
|---|---|---|---|
| 1 inch | 1 mm | 0.102 cm | 0.04″ |
| 1 foot | 12.2 mm | 1.22 cm | 0.48″ |
| 6 ft (person) | 73.2 mm | 7.32 cm | 2.88″ |
| 1 meter | 40 mm | 4 cm | 1.575″ |
| 3 m (room height) | 120 mm | 12 cm | 4.724″ |
| 10 meters | 400 mm | 40 cm | 15.748″ |
| 30 m (building) | 1200 mm | 120 cm | 47.244″ |
Frequently Asked Questions
What is 1:25 scale in mm, cm, and inches?
In 1:25 Scale, 1 unit on the model equals 25 of the same unit in real life. One real foot equals 0.48 inches (12.19 mm) on the model, one real meter equals 40 mm (4.00 cm), and the model is 4% of real size.
How tall is a 6 ft person in 1:25 Scale?
A 6-foot (183 cm) person stands 73.2 mm (2.88 inches) tall in 1:25 Scale.
How do I convert a real measurement to 1:25 Scale?
Divide the real measurement by 25. For example, a 10 m object is 400.0 mm long in 1:25 Scale. The calculator on this page does this automatically in both directions.