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Event and Conference Carbon Footprint Calculator
Estimate total CO2e for conferences and events.
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About Event and Conference Carbon Footprint Calculator
Free event carbon calculator: attendees, travel split, catering style and venue energy hours into total kg CO2e and per-attendee footprint. No forms, no signup.
Where event emissions come from
Attendee travel is usually 70 to 90 percent of an event footprint, dominated by flights. Catering and venue energy make up most of the rest. Cutting one long-haul flight beats a year of vegan menus, and this breakdown shows it.
How planners use the result
Enter your headcount and travel assumptions to get total tonnes and kg per attendee. Use the per-attendee figure in sustainability pages, RFP answers, and offset budgets.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Event Carbon Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about Event and Conference Carbon Footprint Calculator
What dominates a conference footprint?
Attendee travel, especially flights. For a 500-person national conference, flights often exceed venue and catering combined by an order of magnitude.
How much does catering choice matter?
A vegan menu runs roughly 1.5 kg CO2e per meal versus 5 to 6 for a meat menu. Across 1,000 covers that is several tonnes saved.
Should I include venue energy?
Yes for Scope 3 reporting completeness. Enter the venue power draw in kW times event hours; lighting, HVAC and AV add up fast in large halls.
Are results audit-grade?
No. They are planning estimates from illustrative factors. Use them for scoping and communications, not formal disclosures.
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