Urban Heat Island Effect Calculator
Urban Heat Island Effect Calculator estimates the surface urban heat island intensity (SUHII) in degrees Celsius for a city based on impervious surface area, green space, population density, and city size. Input the parameters and calculate the UHI intensity.
Enter Parameters
How to Use Urban Heat Island Effect Calculator:
- Enter the percentage of impervious surfaces (e.g., concrete, asphalt), green space (e.g., trees, parks), and population density using the keypad or direct input; use “Next” to switch fields.
- Select the city size (small, medium, large).
- Click “Calculate” to see the estimated UHI intensity and step-by-step breakdown.
- Use “Share Result” to share or “Export Result” to download as a text file.
Formula:
Surface Urban Heat Island Intensity (SUHII):
SUHII (°C) = (0.05 × ISA%) + (0.02 × (100 – Green%)) – (0.03 × Green%) + (0.5 × PopDensityFactor) + CitySizeBase
Where: ISA% = impervious surface percentage, Green% = green space percentage, PopDensityFactor = population density / 50,000, CitySizeBase = 0 (small), 1 (medium), 2 (large).
Important Notes:
- Inputs: Impervious and green percentages (0-100%), population density (0-50,000 people/km²).
- This is a simplified model for educational purposes. Real UHI assessments require detailed data (e.g., satellite LST, meteorological records).
- City size adjusts baseline UHI: small (<5°F), medium (<9°F), large (<19°F). [](https://calepa.ca.gov/climate/urban-heat-island-index-for-california/understanding-the-urban-heat-island-index/)
- Clipboard access requires HTTPS. If exporting fails, try accessing over HTTPS or copy manually.
- Results are estimates. For precise UHI analysis, use tools like ENVI-met or ArcGIS. [](https://learn.arcgis.com/en/projects/map-and-analyze-the-urban-heat-island-effect/)[](https://en.wikipedia.org/wiki/Urban_heat_island)