Refugee Camp Population Calculator
Estimate refugee camp population capacity from site area, shelter type, and services using UNHCR and Sphere standards.
Refugee Camp Population Calculator
Calculator
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Formula: Capacity = min(Usable Area / 45 m2, Number of Shelters x Persons per Shelter)
Worked example — Recommended capacity: 2,000 people | 2,000 shelters | 40,000 L water/day | 100 latrines
Formula
Capacity = min(Usable Area / 45 m2, Number of Shelters x Persons per Shelter)
Camp capacity is determined by the more restrictive of two constraints: the UNHCR minimum of 45 square meters per person for overall site planning, and the number of shelter units that fit in the usable area multiplied by occupants per shelter.
Worked Examples
Example 1: Medium-Sized Camp Planning
Problem:A 15-hectare site with 60% usable area using family tents (5 persons per tent). Estimate capacity and services.
Solution:Total area: 15 ha = 150,000 m2 Usable area: 150,000 x 0.60 = 90,000 m2 Max by area (45 m2/person): 90,000 / 45 = 2,000 people Shelters (45 m2 plot): 90,000 / 45 = 2,000 tents Capacity by shelters: 2,000 x 5 = 10,000 Recommended capacity: min(2,000, 10,000) = 2,000 Water: 2,000 x 20 = 40,000 L/day Latrines: 2,000 / 20 = 100
Result:Recommended capacity: 2,000 people | 2,000 shelters | 40,000 L water/day | 100 latrines
Example 2: Emergency Camp with Minimal Shelters
Problem:A 5-hectare site with 50% usable area using emergency shelters for 6 persons each.
Solution:Total area: 5 ha = 50,000 m2 Usable area: 50,000 x 0.50 = 25,000 m2 Max by area: 25,000 / 45 = 555 people Shelters (30 m2 plot): 25,000 / 30 = 833 Capacity by shelters: 833 x 6 = 4,998 Recommended: min(555, 4,998) = 555 Latrines: 555 / 20 = 28
Result:Recommended capacity: 555 people | 833 shelters | 11,100 L water/day | 28 latrines
Frequently Asked Questions
What is the minimum area per person recommended for refugee camps?
The UNHCR Handbook for Emergencies recommends a minimum of 45 square meters per person for the overall camp site, which includes shelter space, communal areas, roads, firebreaks, and service facilities. The Sphere Standards specify a minimum covered floor area of 3.5 square meters per person for the shelter itself. These standards are designed to ensure adequate living conditions, prevent disease outbreaks, reduce fire risk, and maintain human dignity. In emergency situations the initial response may temporarily fall below these standards, but planners should aim to meet or exceed them as quickly as possible to avoid overcrowding-related health and safety problems.
How is the usable area of a camp site determined?
The usable area of a refugee camp site is the portion of land that can actually be used for shelter plots and associated facilities after accounting for terrain constraints. Typically only 50 to 70 percent of a site is usable for shelters. The remaining area is allocated to community facilities such as health centers schools and distribution points, roads and pathways for vehicle and pedestrian access, firebreaks which are mandatory open spaces to prevent fire spread between blocks, administrative areas for camp management, water and sanitation infrastructure including boreholes latrines and drainage, and buffer zones along the camp perimeter for security and environmental protection.
What are the water supply standards for refugee camps?
The Sphere Humanitarian Standards specify a minimum of 15 to 20 liters of water per person per day for drinking cooking and personal hygiene in camp settings. This is considered a survival-level provision. Ideally camps should provide at least 20 liters per person per day with water points located no more than 200 meters from any shelter. Additional water is needed for health facilities at 40 to 60 liters per patient per day, feeding centers at 20 to 30 liters per patient per day, and livestock if present. Water distribution points should serve no more than 250 people each, and queuing time should not exceed 30 minutes.
How are sanitation facilities calculated for a refugee camp?
The Sphere Standards recommend a maximum of 20 people per latrine in the initial emergency phase with a long-term target of one latrine per family or household. Latrines should be located no more than 50 meters from shelters but at least 30 meters from water sources to prevent contamination. Separate facilities should be provided for men and women with a recommended ratio of three female latrines for every one male latrine. Solid waste disposal requires at least 100 liters of refuse pit space per person per year. Drainage systems must handle both grey water from washing and stormwater runoff to prevent standing water which breeds mosquitoes and spreads disease.
What types of shelter are commonly used in refugee camps?
The most common shelter types in refugee camps include standard UNHCR family tents which measure approximately 17.5 square meters and are designed for a family of five to six people as an initial emergency response. Transitional shelters are semi-permanent structures made from local materials with improved roofing and can last two to three years. Prefabricated units are factory-made structures that offer better insulation and durability but cost significantly more and require transportation logistics. Emergency shelters are the most basic option using tarpaulins and basic framing for immediate protection. The choice depends on the expected duration of displacement, climate conditions, available budget, and local construction materials and practices.
Why is camp capacity taken as the smaller of the area limit and the shelter limit?
Two independent constraints bound how many people a site can hold. The area constraint divides usable area by the 45 square meter per person site-planning figure. The shelter constraint divides usable area by the plot size for the chosen shelter type, then multiplies the resulting number of plots by occupants per shelter. Whichever yields the lower number governs, because a site that fits enough tents but violates the per-person area standard is overcrowded, and a site with ample area but too few plots simply cannot house more households.
What is the difference between covered floor area per person and site area per person?
Covered floor area is the roofed living space inside a shelter, with a widely used humanitarian minimum of 3.5 square meters per person in temperate conditions and more in cold climates where people spend longer indoors. Site area per person, around 45 square meters, is a whole-camp figure that additionally absorbs plot spacing, roads, firebreaks, latrines, water points, health and education facilities, and administrative space. A camp can satisfy the covered-area standard inside each tent while still failing the site standard if the layout is packed too tightly.
Why do camp layouts reserve land for firebreaks and access roads?
Tents and transitional shelters built from tarpaulin, timber and thatch burn fast, and fire spreads shelter to shelter when blocks are continuous. Firebreaks are deliberately empty corridors that divide the built-up area into blocks so a fire stops at the gap. This tool reports an indicative firebreak allocation of five percent of gross site area and a roads and pathways allocation of fifteen percent, shown as planning guidance rather than deducted from the usable percentage you set, so keep them in mind when choosing that percentage. The access allowance is what keeps water trucking, ambulances and desludging vehicles able to reach every block, which is why it must stay clear of shelter encroachment over time.
How should population density per hectare be interpreted when comparing sites?
Density per hectare is capacity divided by gross site area in hectares, so the 45 square metre per person site standard corresponds to about 222 people per hectare if every square metre were usable. Because capacity here is capped by usable area divided by 45, the figure this tool displays can never exceed that ceiling and in practice sits near 222 times your usable fraction, roughly 133 at 60 percent. Measured densities in an existing camp can exceed the ceiling, and when they do they signal overcrowding: longer queues at water points, greater fire risk and easier transmission of respiratory and diarrhoeal disease. Use density as one comparable screening number across candidate sites of different shapes.
Which site characteristics can make a calculated capacity unachievable in practice?
The calculation treats usable area as a single percentage, but real sites lose land unevenly. Slopes steeper than roughly five percent complicate drainage and latrine construction, seasonal flooding rules out low-lying ground, rocky substrate blocks pit digging and forces costlier sanitation, and a water table close to the surface risks contamination from latrines. Aquifer yield, road access for supply convoys, land tenure agreements and distance to the host community frequently cap a camp well below its geometric capacity, so a physical site assessment must confirm any figure produced here.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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