A carbon footprint calculator estimates greenhouse-gas emissions, usually expressed as tonnes of CO₂-equivalent (tCO₂e). It is the first step to any credible reduction plan.
Scope 1 / 2 / 3
- Scope 1: direct emissions from owned sources (fuel, fleet).
- Scope 2: purchased electricity, heat, steam.
- Scope 3: value-chain emissions — usually the largest and hardest bucket.
How to use a calculator
Collect activity data (energy bills, travel, procurement), map to emission factors, and review the breakdown to find the biggest levers. Our Chinese 碳中和助手 provides calculators and policy references.
Reduction steps
- Switch to renewable electricity (PPA / on-site PV).
- Improve efficiency (heat recovery, variable-speed drives).
- Electrify fleets and process heat.
- Engage suppliers on Scope 3.
Frequently Asked Questions
What is the difference between Scope 1 and Scope 3?
Scope 1 is emissions you directly control; Scope 3 covers your supply chain and is typically the largest share.
Is a corporate or personal calculator better?
Corporate calculators use spend/activity-based factors for Scope 1–3; personal ones focus on home, travel and diet.