Architect Scale · 1:20
1:20 detail grid - every 25 mm cell equals 500 mm on site.
Pre-scaled architectural and engineering grids let you draw in real-world units directly on the page. Pick the ratio that matches the drawing - 1:50 for residential plans, 1:100 for whole buildings, 1:200 for site layouts, 1:500 for master plans. Background: A reading list on technical-drawing standards.
1:20 detail grid - every 25 mm cell equals 500 mm on site.
1:50 plan grid - every 20 mm cell equals 1 metre.
1:100 plan grid - every 10 mm cell equals 1 metre.
1:200 site grid - every 5 mm cell equals 1 metre.
1:500 master plan grid - every 10 mm cell equals 5 metres.
1:1000 urban grid - every 10 mm cell equals 10 metres.