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Cool Roofs Calculator
Calculate energy savings and heat reduction from reflective roofing
Addresses
Extreme Heat
- Cost
- Free · Open-source
- Open-Source
- Difficulty
- Beginner
- Language
- —
- Updated
- 2024
You provide
- Building location / climate zone
- Roof area
- Current roof reflectance
- Energy tariff
You get
- Annual energy & cost savings
- Surface-temperature reduction
- CO2 reduction estimate
Overview
The Cool Roofs Calculator from Lawrence Berkeley National Laboratory estimates the energy, cost, and urban-heat benefits of replacing conventional roofing with high-reflectance (“cool”) materials.
Key features
- Energy and cost-savings estimates by climate zone
- Surface-temperature and cooling-load reduction
- Carbon-reduction calculations
- Backed by LBNL Heat Island Group research
Who it’s for
Building owners, sustainability officers, and policymakers evaluating cool-roof programs.
Getting started
Run the calculator at coolroofs.lbl.gov.