01
TO Formula
The general calculation divides footprint by lot area.
TO = footprint ÷ lot area × 10002
How to Interpret TO
A result of 40% means the considered footprint equals 40% of the lot.
03
TO and Municipal Zoning
The maximum and legal counting method come from applicable local rules.
04
Common Mistakes
Do not add every floor into TO, equate all open area with permeability or assume a national default.
FAQ
Frequently Asked Questions
Does this tool confirm project approval?+
No. It performs mathematical calculations using supplied values and does not replace municipal law, professional analysis or official approval.
Are the parameters the same across Brazil?+
No. Zoning limits and definitions vary by municipality, zone and the applicable version of local rules.