1:5 Scale Calculator & Conversion Chart

Large RC & engine scale · 20% of real size

1:5 is the giant of hobby scales — large-scale RC cars with real gasoline engines, cutaway engine models, and prop replicas. At a fifth of real size, parts are big enough to machine from metal, and physics starts behaving like the real thing, which is exactly why 1:5 RC racing exists.

Precision Scale Converter & Calculator

Real World Size

Scale (1 : N)

Scaled Size

1:5 Scale Quick Facts

Scale factor: 1 ÷ 5 (20% of real size)
1 real foot = 2.4″ (60.96 mm) on the model
1 real meter = 200 mm (20 cm) on the model
A 6 ft (183 cm) person = 365.8 mm (14.4″) tall
Model is 20% of real size — use this as the scale percentage in 3D-print slicers

1:5 Scale Reference Chart

Real Size	mm	cm	inches
1 inch	5.1 mm	0.508 cm	0.2″
1 foot	61 mm	6.1 cm	2.4″
6 ft (person)	365.8 mm	36.58 cm	14.4″
1 meter	200 mm	20 cm	7.874″
3 m (room height)	600 mm	60 cm	23.622″
10 meters	2000 mm	200 cm	78.74″
30 m (building)	6000 mm	600 cm	236.22″

Frequently Asked Questions

What is 1:5 scale in mm, cm, and inches?

In 1:5 Scale, 1 unit on the model equals 5 of the same unit in real life. One real foot equals 2.4 inches (60.96 mm) on the model, one real meter equals 200 mm (20.00 cm), and the model is 20% of real size.

How tall is a 6 ft person in 1:5 Scale?

A 6-foot (183 cm) person stands 365.8 mm (14.4 inches) tall in 1:5 Scale.

How do I convert a real measurement to 1:5 Scale?

Divide the real measurement by 5. For example, a 10 m object is 2000.0 mm long in 1:5 Scale. The calculator on this page does this automatically in both directions.

Is 1/5 the same as 1:5 Scale?

Yes — "1/5", "1:5", and "1:5 Scale" all describe the same ratio. The scale factor is 1 ÷ 5, so the model is 20% of real size. Enter 5 in the calculator above to convert any measurement to or from this scale.