Climate Migration Risk Calculator

A climate migration risk assessment evaluates how likely a population is to be displaced due to climate-related hazards such as flooding, extreme heat, drought, sea level rise, and wildfires. It combines physical hazard exposure with socioeconomic vulnerability and adaptive capacity to produce a composite risk score. Governments, NGOs, and businesses use these assessments to plan adaptation strategies and allocate resources.

The score is calculated from three weighted components: Hazard Exposure (50%), Socioeconomic Vulnerability (30%), and Adaptive Capacity (20%). Each component draws from specific inputs — for example, flood risk level, extreme heat days, and sea level rise contribute to hazard exposure, while GDP per capita, infrastructure quality, and social safety net strength inform adaptive capacity. The emissions scenario and time horizon then scale the final score upward to reflect long-term climate trajectory.

Climate risks pose growing threats to livelihoods, infrastructure, food security, and public health. Without assessment, communities risk being unprepared for displacement events that can strain social systems and economies. Companies are projected to lose up to 7% of EBITDA from physical climate risks by 2035 without adaptation. Understanding risk levels enables proactive investment in resilience measures, early warning systems, and migration planning.

SSP (Shared Socioeconomic Pathways) are IPCC-defined scenarios that describe different possible futures based on greenhouse gas emissions trajectories. SSP1-2.6 assumes strong global mitigation, limiting warming to around 1.5–2°C, while SSP5-8.5 assumes very high emissions with 4–5°C+ of warming by 2100. Higher-emissions scenarios dramatically increase hazard frequency and severity, leading to significantly greater displacement risk over time.

Adaptive capacity refers to a population's ability to respond to, cope with, and recover from climate impacts. It encompasses financial resources (measured via GDP per capita), governance quality, infrastructure resilience, and social safety net strength. Regions with high adaptive capacity can implement early warning systems, relocate vulnerable populations, and invest in climate-proofing infrastructure — all of which reduce displacement risk even when hazard exposure is high.

This calculator provides a modeled estimate based on widely used risk assessment frameworks drawn from IPCC methodologies and climate resilience research. It is intended for educational and planning purposes rather than precise scientific forecasting. Real-world displacement depends on complex interactions between policy responses, local geography, migration networks, and social systems that go beyond what any single calculator can capture.

Research consistently identifies low-elevation coastal zones in South and Southeast Asia, sub-Saharan Africa, small island developing states (SIDS), and parts of Central America as facing the highest displacement risks. These regions combine high hazard exposure — from cyclones, floods, and drought — with lower adaptive capacity. Inland regions dependent on rain-fed agriculture in arid or semi-arid climates are also highly vulnerable.

This calculator can provide a useful starting point for understanding physical climate risk exposure at a regional level, which is increasingly required under frameworks like TCFD (Task Force on Climate-related Financial Disclosures) and the SEC's climate disclosure rules. However, for formal regulatory reporting, organizations should complement this tool with detailed site-specific assessments and certified climate risk modeling platforms.