Enter the total number of dwellings and the land area into the calculator to determine the number of dwellings per hectare. Supports conversion between hectares, acres, square meters, and square kilometers.
Dwellings Per Hectare Formula
The following formula is used to calculate the number of dwellings per hectare.
D/H = TD / LA
Variables:
- D/H is the number of dwellings per hectare
- TD is the total number of dwellings
- LA is the land area in hectares (1 hectare = 10,000 m² = 2.471 acres)
What is Dwellings Per Hectare?
Dwellings per hectare (DPH) is the primary residential density metric used in UK, Australian, and most metric-system planning jurisdictions. It directly determines infrastructure sizing requirements, school catchment capacity, transport investment thresholds, and open space provision standards. A single DPH figure can legally unlock or block development under zoning codes, making accurate calculation critical.
Density Classification Reference
| Classification | DPH Range | Typical Form |
|---|---|---|
| Very Low | < 10 | Rural, large-lot detached homes |
| Low | 10 to 20 | Suburban detached and semi-detached |
| Medium-Low | 20 to 40 | Terraced housing, townhouses |
| Medium | 40 to 80 | Low-rise flats, mixed-use blocks |
| High | 80 to 150 | Mid-rise apartments, urban infill |
| Very High | 150 to 400 | Urban core apartments |
| Ultra High | > 400 | High-rise towers, super-density developments |
Net vs. Gross Density: A Critical Distinction
The same development site can produce radically different DPH figures depending on which land area is measured. Gross density includes the full site footprint: internal roads, landscaping, car parks, and shared open space. Net density excludes all non-residential land and counts only the parcels directly supporting dwellings. Net DPH typically runs 1.4 to 2 times higher than gross DPH for the same site. When comparing schemes or reviewing planning applications, always confirm which measure is being cited, as the distinction can mean the difference between a project complying with or breaching a density policy threshold.
Global City Benchmarks
| Location | Density | Notes |
|---|---|---|
| Barcelona urban core | ~400 DPH | Among Europe’s densest mid-rise urban grids |
| Paris (Department de Paris) | ~213 people/ha | 2x the population density of London overall |
| London new builds (average) | 153 DPH | Average for new residential approvals in Greater London |
| Islington (densest London borough) | ~138 people/ha | Primarily Victorian terraces and mansion blocks |
| London central (max PTAL) | up to 400 DPH | London Plan upper threshold for highest-accessibility sites |
| Suburban London (PTAL 2-3, houses) | 30 to 65 DPH | London Plan density matrix range |
| Guelph, Ontario (high-density max) | 150 units/ha | Canadian high-density apartment zoning cap |
UK Planning Policy Thresholds
| Policy / Framework | Threshold | Context |
|---|---|---|
| NPPF baseline | 30 DPH | UK national minimum for sustainable housing sites |
| Essex Design Guide (urban existing) | 50 DPH minimum | Existing urban centre residential sites |
| Essex Design Guide (neighbourhood avg) | 65 DPH average | Required average for new neighbourhood schemes |
| Essex Design Guide (compact) | 75 DPH minimum | Compact development typology |
| London Plan (suburban houses) | 30 to 65 DPH | PTAL 2-3 suburban setting |
| London Plan (urban, avg PTAL 2-3) | 145 DPH | Urban setting indicative density |
| London Plan (central, avg PTAL 2-3) | 210 DPH | Central setting indicative density |
How to Calculate Dwellings Per Hectare
Divide the total number of dwellings by the land area in hectares. For gross density, include all land within the site boundary. For net density, include only the land directly used for residential development, excluding roads, parks, and non-residential uses. When working in acres, multiply the acreage by 0.404686 to convert to hectares before dividing.
Example: A 3-hectare site contains 120 dwellings. D/H = 120 / 3 = 40 dwellings per hectare. This falls in the medium-low range, typical of terraced housing or townhouse developments. If the 3 hectares is a gross figure and roads account for 30% of the site, the net density would be 120 / 2.1 = approximately 57 DPH, pushing the scheme into the medium range and potentially triggering different infrastructure contribution requirements.
