Isometric 30° · 20 mm

About Isometric 30° · 20 mm

A presentation-scale isometric with a generous 20 mm cell pitch. Wide enough to fit a complete axonometric of a small building onto a single A2 sheet, with each cell representing one metre at 1:50 - a popular convention for axonometric site plans in British architectural practice. Further reading: A practitioner reading list covers the standards lineage in more depth.

Standards lineage

Compatible with ISO 5456-3 isometric projection; pitch tuned to ISO 5455 1:50 architectural scale.

A short history

Large-pitch isometric grids were popularised by James Stirling and the Cambridge architects of the 1970s for axonometric drawings of buildings and urban blocks - the Stirling-Wilford office templates were 20 mm grids on A1.

Where designers reach for it

• Axonometric site plans at 1:50
• Whole-building cutaway studies
• Urban-design block axonometric drawings
• Concept axonometric for planning submissions

Printing this grid

Every variant on this page is delivered as a vector SVG with physical millimetre dimensions baked into the file, so a compliant printer driver will reproduce it at exact 1:1 scale by default. Choose the sheet size that matches your printer tray, set scaling to 100 % (never "fit to page"), and verify with the calibration check on our how-to-print guide. Buyer's guide: Comparing the major architectural scale rulers can help you pick the right physical scale rule to use over the printed grid.