Calculadora de Coeficiente de Aproveitamento (CA)
Calcule o coeficiente de aproveitamento do terreno para projetos arquitetônicos.
Current Floor Area Ratio
0.40
Current Floor Area Ratio vs Total Lot Area (sq ft)
Formula
## Floor Area Ratio (FAR) FAR is a zoning measurement that compares the total floor area of a building to the area of the lot it sits on. It controls building bulk and is especially important in urban zoning. ### Formula **FAR = Total Building Floor Area / Lot Area** For example, a 6,000 sq ft building on a 15,000 sq ft lot has a FAR of 0.40. ### How FAR Controls Development - FAR of 0.25-0.50: Low-density residential (single-family) - FAR of 0.50-1.0: Medium-density residential (townhomes, duplexes) - FAR of 1.0-3.0: Mixed-use, multifamily, low-rise commercial - FAR of 3.0-10.0: Urban commercial, mid-rise to high-rise - FAR of 10.0+: Dense urban core (Manhattan-type development) ### FAR vs. Lot Coverage - Lot coverage limits the footprint; FAR limits total floor area - A tall, narrow building can have a high FAR with low lot coverage - Both must be satisfied for zoning compliance ### FAR Bonuses Many cities offer FAR bonuses for public plazas, affordable housing, LEED certification, or transit-oriented development.
Exemplo Resolvido
A 15,000 sq ft lot with a 2-story building totaling 6,000 sq ft, and a maximum allowed FAR of 0.50.
- 01Current FAR: 6,000 / 15,000 = 0.40
- 02Maximum allowed floor area: 15,000 x 0.50 = 7,500 sq ft
- 03Remaining buildable: 7,500 - 6,000 = 1,500 sq ft
- 04Average floor plate: 6,000 / 2 = 3,000 sq ft
- 05Implied lot coverage: 3,000 / 15,000 = 20.0%
- 06FAR utilization: 0.40 / 0.50 = 80.0%
Perguntas Frequentes
What areas count toward FAR?
Generally, all enclosed habitable floor area counts, including each story of a multi-story building. Garages, basements, mechanical rooms, and parking structures may be partially or fully excluded depending on the local zoning code. Always check the specific definition in your jurisdiction.
Can I increase the allowable FAR?
Yes, through several mechanisms: rezoning to a higher-density zone, FAR bonuses for including affordable housing or public amenities, Planned Unit Development (PUD) approvals, or Transfer of Development Rights (TDR) programs. Each approach has different requirements and timelines.
How does FAR affect property value?
Unused FAR (the gap between current FAR and maximum FAR) represents development potential and adds value. Properties with significant unused FAR in desirable locations command premium prices because buyers can add floor area. This is sometimes called the "air rights" value.