Turn a room list into net internal area (NIA), gross floor area (GFA) and a net-to-gross efficiency ratio — instantly, free, in your browser. Perfect for early briefs and feasibility checks.
Spaces
Space
Count
m² each
Allowances
Tip: circulation of 15–25% suits offices and apartments; schools, labs and healthcare typically need 30–40%. Walls, cores & structure usually add another 5–12% on top.