1:18 Scale Calculator & Conversion Chart
Premium diecast standard · 5.56% of real size
1:18 dominates the collectible diecast car market — a typical sedan comes out around 25 cm long, big enough for opening doors, detailed engine bays, and poseable steering. It is also common for premium action figures and military figure dioramas.
Precision Scale Conversion Calculator
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1:18 Scale Quick Facts
- 1 real foot = 0.667″ (16.93 mm) on the model
- 1 real meter = 55.56 mm on the model
- A 6 ft (183 cm) person = 101.6 mm (4″) tall
- Model is 5.56% of real size — use this as the scale percentage in 3D-print slicers
1:18 Scale Reference Chart
| Real Size | mm | cm | inches |
|---|---|---|---|
| 1 inch | 1.4 mm | 0.141 cm | 0.056″ |
| 1 foot | 16.9 mm | 1.69 cm | 0.667″ |
| 6 ft (person) | 101.6 mm | 10.16 cm | 4″ |
| 1 meter | 55.6 mm | 5.56 cm | 2.187″ |
| 3 m (room height) | 166.7 mm | 16.67 cm | 6.562″ |
| 10 meters | 555.6 mm | 55.56 cm | 21.872″ |
| 30 m (building) | 1666.7 mm | 166.67 cm | 65.617″ |
Frequently Asked Questions
What is 1:18 scale in mm, cm, and inches?
In 1:18 Scale, 1 unit on the model equals 18 of the same unit in real life. One real foot equals 0.667 inches (16.93 mm) on the model, one real meter equals 55.56 mm (5.56 cm), and the model is 5.56% of real size.
How tall is a 6 ft person in 1:18 Scale?
A 6-foot (183 cm) person stands 101.6 mm (4 inches) tall in 1:18 Scale.
How do I convert a real measurement to 1:18 Scale?
Divide the real measurement by 18. For example, a 10 m object is 555.6 mm long in 1:18 Scale. The calculator on this page does this automatically in both directions.