Urban Planning & Cities Calculators — Australia
Density, land, transport and demand at the scale of a suburb or a city. The arithmetic is the same everywhere; the rates you plug in are local, so they are inputs rather than assumptions.
Density, land & zoning
Population Density Calculator
Population density from people and area — per square kilometre, per hectare, per square mile — with the classification band it falls into and what a growth target does to it.
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Building Height Limit Calculator
How many storeys fit under a height limit — or how tall a given number of storeys will be — from the floor-to-floor heights that ground floors, upper floors and roof plant actually take.
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Zoning Yield Calculator
How many lots or dwellings a site yields once roads, open space and minimum lot sizes are taken out — the number a developer's first feasibility runs on.
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Land Use Mix Calculator
A land-use mix index from the share of land in each use — the entropy measure planners use to say whether a neighbourhood is genuinely mixed or just labelled that way.
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Housing Mix Calculator
The population, bedroom count and average household size a development yields from its mix of studios, one-, two- and three-plus-bedroom dwellings.
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Public Space Ratio Calculator
The share of a district that is public — streets, squares and parks — against the UN-Habitat benchmark of 45 to 50%, and what it would take to reach it.
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Dwelling Density Calculator
Net dwelling density and population density for a site from its area, lot size or dwelling count, and household size — with the housing typology that density implies.
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Building Shadow Calculator
How long a building’s shadow is at a given sun altitude, how high that shadow reaches on a neighbouring building at a given distance, and whether a neighbour’s window is overshadowed.
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Housing Need Calculator
How many dwellings an area needs to build each year to house its projected population — from growth, household size, a healthy vacancy rate and the replacement of old stock.
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Jobs–Housing Balance Calculator
The jobs–housing balance of an area — jobs per dwelling and jobs per resident worker — and what the ratio says about commuting in and out.
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Transport & access
Transit Catchment Calculator
The population within walking distance of a station or stop — from the walk time people will accept, their walking speed, the street network detour, and the density around it.
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Walkability Score Calculator
A walkability score from the walking distance to the things people need daily — groceries, school, transit, park, café — with each one decaying past a comfortable walk.
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Service Accessibility Calculator
How many people a facility — a clinic, a library, a school — serves within a travel-time threshold, and how many facilities a district needs so everyone is within reach.
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Parking Demand Calculator
How many parking spaces a development generates under a set of rates, and how much land, area and money those spaces consume — which is why parking is often the largest single cost in a project.
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Modal Share Calculator
The share of trips by each mode — car, transit, cycling, walking — and what a shift between modes does to daily car kilometres and emissions.
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Transit Frequency and Capacity Calculator
What a bus, tram or train route delivers from its headway — capacity per hour in each direction, the average wait for a passenger who just turns up, and the vehicles needed to run it.
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Parking Lot Capacity Calculator
How many car spaces a site can hold from its area and the bay layout — 90°, 60°, 45° or parallel — allowing for aisles, circulation and the accessible bays required.
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Pedestrian Level of Service Calculator
The level of service on a footpath, corridor or platform from the pedestrian flow and the effective width — the Highway Capacity Manual’s A to F scale — and the width needed to reach a chosen level.
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Walking Radius Calculator
The distance a walk of a given number of minutes covers, the straight-line radius that corresponds to it through a real street network, the area inside that radius and the population it contains at a given density — the arithmetic of the 15-minute city.
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Demand & services
Utility Demand Per Capita Calculator
The demand a population places on a utility — average and peak — from a per-capita rate and a peaking factor, for water, sewerage, power or gas.
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Green Space Per Capita Calculator
Green space per person for a suburb or city, against the WHO minimum of 9 m² and the 50 m² that well-served cities reach — and how much more is needed to hit a target.
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Infrastructure Load Calculator
The load a new development adds to each network — water, sewer, electricity and road traffic — from dwellings, occupancy and per-dwelling rates, in the units each network is sized in.
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Smart Meter Rollout Calculator
How long a smart-meter or sensor rollout takes and what it costs — from meters to fit, installs per crew per day, crews available and the share of visits that fail first time.
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Sensor Network Density Calculator
How many sensors an area needs at a given range — with the overlap a reliable network requires, and the spacing between them.
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Retail Floorspace Demand Calculator
How much retail floor space a catchment can support — from population, spending per person, the share captured locally, and the sales each square metre needs to be viable.
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City Energy Demand Calculator
The electricity a city or suburb uses in a year and draws at peak — from population, per-capita consumption, a load factor, and how much rooftop solar offsets.
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City Water Demand Calculator
The water a city needs to supply — residential, non-residential, and the share lost to leaks — as daily, peak-day and annual volumes.
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Municipal Waste Generation Calculator
How much waste a population generates, how much is diverted to recycling and composting, what goes to landfill, and the truck movements and landfill space it takes.
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Tree Canopy Target Calculator
How many trees an area must plant to move from its current tree-canopy cover to a target — allowing for the mature canopy each tree gives and the share that will not survive.
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Resilience & growth
Sea Level Exposure Calculator
How many years a coastal site has before sea level rise and land subsidence consume its freeboard — under whatever rate of rise you choose to plan for.
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Flood Return Period Calculator
Convert between a flood's return period and its annual probability — and see the chance it happens at least once over a mortgage, a design life or a lifetime, which is the number that actually matters.
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Urban Heat Island Calculator
An estimate of the urban heat island effect from a neighbourhood's hard surface, tree canopy and surface reflectance — and how much cooling more canopy or lighter surfaces would buy.
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Land Value Capture Calculator
The uplift in land value that a rezoning or a new station creates, and how much of it a value-capture mechanism returns to the public — the arithmetic behind infrastructure contributions and betterment levies.
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Urban Growth Projection Calculator
Where a city's population will be in 10, 20 and 30 years at a growth rate — and how much new dwellings and land that needs at a chosen density, split between infill and greenfield.
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Rational Method Runoff Calculator
The peak stormwater runoff from a catchment — the rational method, Q = C i A — from the surface type, the design rainfall intensity and the area, in cubic metres and litres per second.
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Stormwater Detention Calculator
The on-site detention a development needs to hold back the extra runoff it creates — from the change in impervious area and the design storm — with the tank size and the time it takes to drain at a permitted outflow.
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About these calculators
These are planning-scale estimates from the standard relationships — density from people and area, demand from population and a per-capita rate, catchment from a walking distance. They are for sizing and comparison, not for a development application: local planning schemes set the numbers that bind.