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This document presents the methodology used to build the EX-Ante Carbon Balance Tool version 9 (EX-ACT). It describes in detail the main logic behind the tool, the tool structure, and the underlying equations and parameters used to calculate the carbon balance. EX-ACT is a land-use-based accounting system developed by the Food and Agriculture Organization of the United Nations (FAO) to evaluate the effects of the interventions in agriculture on greenhouse gas (GHG) emissions and carbon stock changes expressed as carbon balance. The carbon balance comprises changes in GHG emissions and carbon stock changes in the five quantifiable carbon pools: above-ground biomass, below-ground biomass, litter, deadwood and soil.

The current version of EX-ACT is primarily based on the Intergovernmental Panel on Climate Change (IPCC) reports "Refinement to the 2006 Guidelines for National Greenhouse Gas Inventories" (2019) and "Supplement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories: Wetlands" (2014), complemented by other scientific research.