1:100 Scale Calculator

1:100 is a standard architectural scale for whole-building plans and massing models. At 1:100, 1 cm on the drawing equals 1 metre in reality — a very intuitive relationship.

Scale Converter

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What fits at 1:100

Building floor plans, site plans, massing models and presentation drawings.

Real subjectReal size1:100 model
Two-storey house (height) 8 m 8 cm
Room wall 4 m 4 cm
Tennis court (length) 23.77 m 23.8 cm
Person 1.8 m 1.8 cm

Size comparison at 1:100

Relative model sizes at 1:100 (longest bar = largest model):

1:100 in mm, cm and inches

How common real-world sizes convert to 1:100 model size:

Real sizeModel (mm)Model (cm)Model (inches)
1 m 10 mm 1 cm 0.394 in
2 m 20 mm 2 cm 0.787 in
5 m 50 mm 5 cm 1.97 in
10 m 1 mm 10 cm 3.94 in
1 ft 3.05 mm 0.305 cm 0.12 in
6 ft (person) 18.3 mm 1.83 cm 0.72 in

Frequently asked questions

Why is 1:100 popular in architecture?

Because the maths is effortless: 1 cm equals 1 m, so plans are quick to read and draw.

Related scales

→ See all scales