digambarkan skala 1:60 jika ukuran kamar pada denah 5 cm à 7,5 cm ,ukuran kamar sebenarnya

skala = 1 : 60
jpp = 5 cm
js = jpp : skala = 5 ÷ 1/60 = 5 × 60 = 300 cm = 3 m

jpp = 7,5 cm
js = 7,5 ÷ 1/60 = 7,5 × 60/1 = 450 cm = 4,5 m