Turn a building emissions baseline into a target-year budget and a practical annual pathway. Account for floor-area change to distinguish absolute reduction from the emissions-intensity improvement required as the portfolio grows or contracts.
The main result is the total emissions reduction required. The intensity result adjusts for the entered change in floor area and helps separate portfolio growth from building efficiency.
A straight-line milestone is provided for planning only. Renovation cycles, grid changes, tenant loads, acquisitions, and disposals can create a non-linear pathway.
A 1,500 t CO₂e baseline with a 40% target requires a 600 t CO₂e reduction and a 900 t target budget. With floor area growing 2% annually for eight years, intensity must improve by 48.8%.
Annual floor-area change is compounded to estimate how much intensity must improve while still meeting the absolute emissions target.
Enter a negative floor-area change. Contraction may reduce the intensity improvement required.
Yes. It divides the absolute reduction evenly across the years and does not predict the timing of individual projects.
A 100% reduction produces a zero operational emissions budget, but residual treatment and target standards must be addressed separately.
Use the organizational and portfolio boundary required by your target framework, and apply it consistently when tracking progress.
| Variable | Meaning | Unit |
|---|---|---|
| B | Baseline operational emissions | t CO₂e |
| R | Absolute reduction target | % |
| t | Time to target | years |
| a | Annual floor-area change | %/year |