Cos'e Floor Area Ratio (FAR)?

Floor Area Ratio (FAR) e il total building floor area divided da il lot area. A FAR di 2.0 means you puo build twice il square footage di your lot—per example, 20,000 sq ft di building on un 10,000 sq ft lot, regardless di how many stories.

How big e un city block?

City block sizes vary significantly. Portland's blocks sono 200' × 200' (0.92 acri), Manhattan's standard blocks sono circa 250' × 900' (5.7 acri), e Salt Lake City's sono 660' × 660' (10 acri). There's no universal standard.

Cos'e typical residential density?

Residential density varies widely: suburban areas typically hanno 4-8 units per acro (10-20 per ettaro), urban low-rise neighborhoods 15-30 units per acro, e high-rise areas puo exceed 100 units per acro (250 per ettaro).

Urban Planning Area Unita

Blocks, Lots, e Density Measures

Impara Planning Unita

Urban planners, developers, e zoning officials usare specialized area misurazioni un regulate development, calcolare density, e manage city growth. Comprendere these units—da city blocks un floor area ratios—helps interpret zoning codes e development plans.

City Block Sizes

"City block" varies significantly da city:

City	Typical Block Size	Area
Manhattan (standard)	250' × 900' (N-S) o 250' × 250' (E-W)	5.7 acri
Portland, OR	200' × 200'	0.92 acri
Chicago (standard)	330' × 660'	5.0 acri
Salt Lake City	660' × 660'	10 acri
Barcelona (Eixample)	113m × 113m	1.28 ettari
Melbourne CBD	100m × 200m	2.0 ettari

Nota: Blocks often vary within il same city.

Lot Size Standards

US Residential Zoning

Zone Type	Typical Minimum Lot	Area
High-density urban	2,000-3,000 sq ft	0.05-0.07 acri
Urban residential	5,000-6,000 sq ft	0.11-0.14 acri
Suburban (standard)	7,000-10,000 sq ft	0.16-0.23 acri
Suburban (larger)	0.25-0.5 acri	10,890-21,780 sq ft
Semi-rural	1-2 acri	43,560-87,120 sq ft
Rural residential	5-10 acri	217,800-435,600 sq ft

Converti Area Unita

Floor Area Ratio (FAR)

FAR controls building size relative un lot size:

FAR Calculation

FAR = Total building floor area ÷ Lot area

FAR Esempi

FAR	10,000 sq ft lot allows	Typical Usa
0.5	5,000 sq ft building	Single-family suburban
1.0	10,000 sq ft building	Low-rise residential
2.0	20,000 sq ft building	Mid-rise mixed usare
5.0	50,000 sq ft building	Urban commercial
10.0	100,000 sq ft building	Downtown high-rise
15.0+	150,000+ sq ft building	Dense urban core

Density Measurements

Residential Density

Density Type	Unita per Acro	Unita per Ettaro
Rural	0.1-1	0.25-2.5
Suburban (low)	1-4	2.5-10
Suburban (standard)	4-8	10-20
Urban (low-rise)	15-30	37-74
Urban (mid-rise)	30-75	74-185
Urban (high-rise)	75-200+	185-500+

Population Density

Low density: <5,000 people/sq mile
Medium density: 5,000-15,000/sq miglio
High density: 15,000-50,000/sq miglio
Very high: >50,000/sq miglio

Commercial/Industrial Unita

Office Space

Per employee: 150-300 sq ft (14-28 sq m) typical
Post-COVID trend: 200-400 sq ft per employee

Retail Space

Small retail: 1,000-5,000 sq ft (93-465 sq m)
Big box: 50,000-200,000 sq ft (4,645-18,580 sq m)

Industrial/Warehouse

Small: 10,000-50,000 sq ft
Medium: 50,000-200,000 sq ft
Large distribution: 500,000-1,000,000+ sq ft

Lot Coverage e Open Space

Lot Coverage Ratio

Lot coverage = Building footprint ÷ Lot area

Zone Type	Typical Max Coverage
Single-family residential	30-50%
Multi-family residential	50-70%
Commercial	70-90%
Industrial	50-80%

Open Space Requirements

Many codes require minimum open space:

Private open space: 60-100 sq ft per unit
Comuni open space: 100-200 sq ft per unit
Parks standard: 10 acri per 1,000 residents

Conclusione

Urban planning uses specialized area misurazioni un control development density e form. Floor Area Ratio (FAR) limits total building size relative un lot size. Density measures units o people per acro/ettaro. Comprendere these metrics helps interpret zoning regulations e development potential—whether you're un developer, homeowner, o community member.