1:300 Scale Calculator & Conversion Chart

Micro armor & site plans · 0.333% of real size

1:300 lives a double life: in wargaming it is the European micro-armor standard (effectively interchangeable with 1:285 "6mm"), and in architecture it is a common site-plan ratio between 1:200 and 1:500. Either way, a real meter is just 3.33 mm.

Precision Scale Converter & Calculator

Real World Size

Scale (1 : N)

Scaled Size

1:300 Scale Quick Facts

Scale factor: 1 ÷ 300 (0.333% of real size)
1 real foot = 0.04″ (1.02 mm) on the model
1 real meter = 3.33 mm (0.333 cm) on the model
A 6 ft (183 cm) person = 6.1 mm (0.24″) tall
Model is 0.333% of real size — use this as the scale percentage in 3D-print slicers

1:300 Scale Reference Chart

Real Size	mm	cm	inches
1 inch	0.085 mm	0.008 cm	0.003″
1 foot	1 mm	0.102 cm	0.04″
6 ft (person)	6.1 mm	0.61 cm	0.24″
1 meter	3.3 mm	0.333 cm	0.131″
3 m (room height)	10 mm	1 cm	0.394″
10 meters	33.3 mm	3.33 cm	1.312″
30 m (building)	100 mm	10 cm	3.937″

Frequently Asked Questions

What is 1:300 scale in mm, cm, and inches?

In 1:300 Scale, 1 unit on the model equals 300 of the same unit in real life. One real foot equals 0.04 inches (1.02 mm) on the model, one real meter equals 3.33 mm (0.33 cm), and the model is 0.333% of real size.

How tall is a 6 ft person in 1:300 Scale?

A 6-foot (183 cm) person stands 6.1 mm (0.24 inches) tall in 1:300 Scale.

How do I convert a real measurement to 1:300 Scale?

Divide the real measurement by 300. For example, a 10 m object is 33.3 mm long in 1:300 Scale. The calculator on this page does this automatically in both directions.

Is 1/300 the same as 1:300 Scale?

Yes — "1/300", "1:300", and "1:300 Scale" all describe the same ratio. The scale factor is 1 ÷ 300, so the model is 0.333% of real size. Enter 300 in the calculator above to convert any measurement to or from this scale.