Carbon Disclosure Calculator

Carbon disclosure is the process of publicly reporting your organization's greenhouse gas emissions, climate risks, and reduction strategies. The Carbon Disclosure Project (CDP) is the leading global framework for this reporting. Disclosure increases transparency, builds investor confidence, and helps organizations benchmark progress toward net-zero targets.

Scope 1 covers direct emissions from sources your organization owns or controls — like combustion in boilers or company vehicles. Scope 2 covers indirect emissions from purchased electricity or heat. Scope 3 is everything else in your value chain — employee commuting, business travel, supply chain, and waste. CDP reporting typically requires all three scopes for a complete picture.

tCO₂e stands for metric tonnes of carbon dioxide equivalent. It's a standard unit that converts all greenhouse gases (methane, nitrous oxide, etc.) into their carbon dioxide warming-equivalent. This allows different gases to be compared and totaled on a single scale for reporting purposes.

CDP disclosure is voluntary for most organizations, though it is increasingly requested by institutional investors, major customers, and supply chain partners. Some jurisdictions are introducing mandatory climate disclosure rules — including the EU's CSRD and the SEC's proposed climate rules in the US — that align closely with CDP frameworks.

The US national average grid emission factor of approximately 0.386 kg CO₂e per kWh is used here as a default. This can vary significantly by region and energy mix. Green or renewable power purchases reduce your Scope 2 emissions by displacing carbon-intensive grid electricity.

CDP scores organizations from D (disclosure) up through C, B, A-, to A (leadership). The score depends not only on emissions levels but on the quality of your data, governance structures, target-setting, and reduction actions. This calculator estimates your raw emissions to help you prepare a submission, but final CDP scores are assessed by CDP analysts.

Key reduction strategies include switching to renewable electricity, improving building energy efficiency, electrifying vehicle fleets, reducing business air travel, engaging suppliers on Scope 3 emissions, and setting science-based targets (SBTs) aligned with the Paris Agreement. Incremental improvements across all three scopes compound meaningfully over time.

This tool uses standard IPCC and EPA emission factors to produce a reasonable estimate for planning and awareness purposes. For official CDP submissions, organizations should use audited consumption data, location-specific emission factors, and may wish to engage a third-party verifier for assurance.