Wedding Carbon Footprint Calculator

Guest travel — especially long-haul flights — is typically the single largest source of wedding emissions, often accounting for 50–70% of the total footprint. Food choices (particularly beef) and venue energy use are the next biggest contributors. Cutting even a handful of long-haul flights or swapping beef entrées for plant-based options can make a meaningful difference.

Wedding emissions are measured in kilograms of CO₂ equivalent (kg CO₂e), a standard unit that accounts for all greenhouse gases (CO₂, methane, nitrous oxide, etc.) converted to their equivalent warming effect. This calculator uses widely accepted emission factors for flights, car travel, food types, and energy consumption.

The most impactful steps are choosing a venue close to where most guests live to minimise long-distance travel, offering plant-based menu options, sourcing local and seasonal flowers, and arranging shuttle buses so fewer individual cars are needed. You can also offset remaining emissions by contributing to verified carbon offset programmes or tree-planting initiatives.

A single mature tree absorbs roughly 21 kg of CO₂ per year on average. An average wedding produces somewhere between 5 and 30+ metric tons of CO₂e depending on guest numbers and travel patterns, so offsetting a full wedding typically requires planting hundreds of trees over their lifetime — or contributing to faster-acting offset projects like renewable energy or avoided deforestation.

Yes — significantly. Beef produces roughly 27 kg CO₂e per kg of meat, compared to about 6 kg for chicken and under 3 kg for plant-based proteins. Swapping even half of beef entrées for vegetarian options at a 100-person wedding can reduce food-related emissions by hundreds of kilograms of CO₂e.

Flowers are a smaller but still meaningful contributor. Imported flowers (especially roses flown in from South America or Africa) carry a significant air-freight footprint. Choosing locally grown, seasonal blooms — or opting for potted plants guests can take home — can cut decoration-related emissions by more than half.

This calculator draws on emission factors from established life cycle assessment databases, IPCC transport emission data, and food carbon footprint research. It is designed to give you a reliable order-of-magnitude estimate so you can identify your biggest impact areas and make informed choices — not a certified audit, but a practical planning tool.

Absolutely — that's exactly what it's designed for. By adjusting inputs like guest travel distances, menu choices, and venue type, you can compare different scenarios and see which decisions have the biggest effect on your total footprint before you finalise any bookings.