Free tool · Zoning
Enter the lot area and the building’s floor area. See the floor area ratio, what your zoning still allows, and how many floors fit.
Draw your lot on the real map and push up the massing in Toras. FAR, lot coverage and height update as you shape it.
Open your site in TorasAdd up the floor area of every storey and divide it by the area of the lot.
Three floors of 2,000 sq ft on a 5,000 sq ft lot: 6,000 ÷ 5,000 = a FAR of 1.2.
A 5,000 sq ft lot with an allowed FAR of 2.0 can hold 10,000 sq ft: four floors of 2,500, or five of 2,000.
Counts every floor. Two floors of 1,000 sq ft on a 2,000 sq ft lot is a FAR of 1.0, the same as one floor covering the whole lot.
Counts only the footprint. The same two-storey building covers 50% of the lot; adding floors never changes it.
Usually the gross floor area of every storey. Many zoning codes leave out basements, parking, mechanical rooms or balconies, and each code draws the line differently, so check yours before you rely on the number.
No. FAR measures how much building sits on the lot. Density usually counts homes per acre or hectare.
It varies widely by zone. Suburban houses are often well below 1.0, while dense downtown zones can allow 10 or more.
The idea is the same, the name changes: floor space index (FSI) in India, plot ratio in the UK, Singapore and Hong Kong, floor space ratio in parts of Australia and Canada.