G Scale (1:22.5) Calculator & Conversion Chart
Garden railway scale · 4.44% of real size
G scale runs on 45 mm gauge track outdoors, where its size shrugs off leaves and weather. The "G" family actually spans several ratios (1:20.3 to 1:32) on the same track; 1:22.5 is the classic LGB standard this page uses.
Precision Scale Conversion Calculator
1:
G Scale (1:22.5) Quick Facts
- 1 real foot = 0.533″ (13.55 mm) on the model
- 1 real meter = 44.44 mm on the model
- A 6 ft (183 cm) person = 81.3 mm (3.2″) tall
- Model is 4.44% of real size — use this as the scale percentage in 3D-print slicers
G Scale (1:22.5) Reference Chart
| Real Size | mm | cm | inches |
|---|---|---|---|
| 1 inch | 1.1 mm | 0.113 cm | 0.044″ |
| 1 foot | 13.5 mm | 1.35 cm | 0.533″ |
| 6 ft (person) | 81.3 mm | 8.13 cm | 3.2″ |
| 1 meter | 44.4 mm | 4.44 cm | 1.75″ |
| 3 m (room height) | 133.3 mm | 13.33 cm | 5.249″ |
| 10 meters | 444.4 mm | 44.44 cm | 17.498″ |
| 30 m (building) | 1333.3 mm | 133.33 cm | 52.493″ |
Frequently Asked Questions
What is G scale in mm, cm, and inches?
In G Scale (1:22.5), 1 unit on the model equals 22.5 of the same unit in real life. One real foot equals 0.533 inches (13.55 mm) on the model, one real meter equals 44.44 mm (4.44 cm), and the model is 4.44% of real size.
How tall is a 6 ft person in G Scale (1:22.5)?
A 6-foot (183 cm) person stands 81.3 mm (3.2 inches) tall in G Scale (1:22.5).
How do I convert a real measurement to G Scale (1:22.5)?
Divide the real measurement by 22.5. For example, a 10 m object is 444.4 mm long in G Scale (1:22.5). The calculator on this page does this automatically in both directions.