Carbon Offset Calculator for Events

Offset events of all shapes and sizes, including travel for employees and speakers.


Want to host a carbon neutral event?

Enter your details to calculate your event’s energy consumption.

How is this calculated?

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Air Travel for Staff

Optional: Enter the number of round-trip flights for employees and speakers. Attendees are responsible for offsetting their own travel.

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Total Event Offset
1 tonne = $16.49 USD

Tips to Reduce Your Footprint

Whether you fly less, cut out red meat from meals, or switch to energy-efficient lightbulbs, your small changes taken together can impact the climate crisis.


  • Organize shuttles to and from the airport
  • Host speakers and attendees in a green hotel
  • Reduce miles traveled by hiring local vendors


  • Rent reusable coffee mugs, glasses, plates, and silverware
  • Purchase compostable or high post-consumer waste content paper napkins and towels, and eat what’s on your plate
  • Replace bottled water with filtered water stations


  • Eliminate red meat from meals
  • Offer snacks separate from sandwiches, instead of boxed together
  • Work with a sustainably focused caterer

Why Offset With Cool Effect?

Your Donation in Action

More than 90% of each dollar you donate goes directly to our projects. Only a small fee of 9.87% goes to credit card charges, research, and possible registration fees.

Reducing Carbon Slows Climate Change

Carbon dioxide acts like a greenhouse around the earth, trapping the sun’s energy and warming the planet’s surface. As carbon levels rise, our climate changes.