TT Scale (1:120) Calculator & Conversion Chart

Table Top scale · 0.83% of real size

TT ("Table Top") sits between HO and N at exactly 1:120 — one inch to ten feet. Long a niche in the West but mainstream in Eastern Europe, it has seen a revival since major manufacturers reintroduced ready-to-run TT lines.

Precision Scale Converter & Calculator

Real World Size

Scale (1 : N)

Scaled Size

TT Scale (1:120) Quick Facts

Scale factor: 1 ÷ 120 (0.83% of real size)
1 real foot = 0.1″ (2.54 mm) on the model
1 real meter = 8.33 mm (0.83 cm) on the model
A 6 ft (183 cm) person = 15.2 mm (0.6″) tall
Model is 0.83% of real size — use this as the scale percentage in 3D-print slicers

TT Scale (1:120) Reference Chart

Real Size	mm	cm	inches
1 inch	0.212 mm	0.021 cm	0.008″
1 foot	2.5 mm	0.254 cm	0.1″
6 ft (person)	15.2 mm	1.52 cm	0.6″
1 meter	8.3 mm	0.833 cm	0.328″
3 m (room height)	25 mm	2.5 cm	0.984″
10 meters	83.3 mm	8.33 cm	3.281″
30 m (building)	250 mm	25 cm	9.843″

Frequently Asked Questions

What is TT scale in mm, cm, and inches?

In TT Scale (1:120), 1 unit on the model equals 120 of the same unit in real life. One real foot equals 0.1 inches (2.54 mm) on the model, one real meter equals 8.33 mm (0.83 cm), and the model is 0.83% of real size.

How tall is a 6 ft person in TT Scale (1:120)?

A 6-foot (183 cm) person stands 15.2 mm (0.6 inches) tall in TT Scale (1:120).

How do I convert a real measurement to TT Scale (1:120)?

Divide the real measurement by 120. For example, a 10 m object is 83.3 mm long in TT Scale (1:120). The calculator on this page does this automatically in both directions.

Is 1/120 the same as TT Scale (1:120)?

Yes — "1/120", "1:120", and "TT Scale (1:120)" all describe the same ratio. The scale factor is 1 ÷ 120, so the model is 0.83% of real size. Enter 120 in the calculator above to convert any measurement to or from this scale.