Instant Scale Measurement Calculator for Models & Architecture
Enter a full-size span, choose HO, architectural, or diecast ratios, then copy scaled millimetres and companion units for elevations, track plans, and model components.
Source measurement
Decimal in the unit you selected, or feet and inches (for example 6'2" or 6 ft 2 in). When you use feet and inches, that value is used even if another unit is selected.
Scaled result
Scaled length at 1:50 in millimetres, centimetres, metres, inches, and decimal feet. In the workbench below, the high-contrast bar is your scaled length; lighter shapes are reference-only silhouettes.