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Carbon Calculator

To provide our customers with more up-to-date environmental information, we have an on-line Carbon Calculator for calculating the total annual carbon emission from your electricity consumption over the past 12 months.

The Carbon Calculator has now been updated with 2021 emissions factor. Try it out and see the carbon emissions you have made over the past year.

Please select your preferred calculation method:

Please key in the units consumed in a year and press the "Calculate" button:

units (no comma is required)



  1. The amount of carbon emissions per unit is 0.71 kg CO2-e for the year 2021.
  2. The result is rounded up to the nearest kg.
  3. Carbon emission is an indicative figure only based on the best available information.
  4. For more information on carbon emissions, you can also visit the Low Carbon Living Calculator designed by The Environment Bureau. The Calculator helps the public assess and learn how to reduce their carbon emissions towards a low-carbon living in respect of clothing, food, living and travel.