G Scale Calculator

G scale (commonly 1:22.5) is the large “garden railway” scale, rugged enough to run outdoors. At 1:22.5, a 22.5 cm real measurement becomes 1 cm on the model.

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What fits at 1:22.5

Garden railways, outdoor layouts and large display trains.

Real subject	Real size	1:22.5 model
40 ft boxcar	12.2 m	54.2 cm
EMD F7 locomotive	15.4 m	68.4 cm
Person	1.8 m	8 cm

Frequently asked questions

Why is G scale used in gardens?

Its large size and sturdy track stand up to outdoor conditions, making G scale the standard for garden railways.

Related scales

→ See all scales