kilogram CO2e (kg CO2e)
1 kilogram CO2e = 1,000 grams CO2e
What is kilogram CO2e?
Kilogram of CO2 equivalent (kg CO2e) is the standard unit for expressing carbon footprint measurements. It quantifies greenhouse gas emissions by converting them to the equivalent warming impact of carbon dioxide over a specified timeframe.
Notes: Base unit for carbon emissions
Real-world uses
Kilogram CO2e is the standard unit for product carbon footprints, personal carbon calculators, and emissions intensity metrics. A short-haul flight emits roughly 150–250 kg CO2e per passenger. Food labels and carbon offset programs report in kg CO2e per item or per kg of product.
History
The CO2 equivalent concept was formalized by the IPCC in the 1990s to enable comparison of different greenhouse gases. The 100-year Global Warming Potential (GWP) approach allows methane, N2O, and F-gases to be expressed as equivalent masses of CO2.
Common mistakes
Confusing CO2 with CO2e (CO2 equivalent). CO2e includes the warming effect of other greenhouse gases (methane, N2O) converted to their CO2 warming equivalent using Global Warming Potential (GWP) factors. Pure CO2 accounting underestimates total climate impact.
When is this conversion used?
Converting kilogram CO2e to gram CO2e is useful in the carbon emissions domain when comparing values across different measurement standards or applying formulas that require a specific unit.
How to convert kilogram CO2e to gram CO2e
To convert kilogram CO2e to gram CO2e, multiply the value by 1,000.
Conversion formula (from base unit)
x * 1.0
Measurement standards
The Greenhouse Gas Protocol, maintained jointly by the World Resources Institute and the World Business Council for Sustainable Development, is the de facto global standard for measuring and reporting greenhouse gas emissions across corporate, project, and product life-cycle scopes.
Did you know?
A single transatlantic round-trip flight from London to New York generates roughly 1.6 tonnes of CO₂ per passenger — nearly a quarter of the average annual carbon footprint of a person in France.
| kilograms CO2e | grams CO2e |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
Full kilogram CO2e conversion table
| Unit | Value | Factor |
|---|---|---|
| gram CO2e | 1 kg CO2e = 1,000 g CO2e | × 1,000 |
| tonne CO2e | 1 kg CO2e = 0.001 t CO2e | × 0.001 |
| watt hour CO2e equivalent | 1 kg CO2e = 2,247.19101124 Wh→CO2e | × 2,247.19101124 |
| kilowatt hour CO2e equivalent | 1 kg CO2e = 2.24719101 kWh→CO2e | × 2.24719101 |
| megawatt hour CO2e equivalent | 1 kg CO2e = 0.00224719 MWh→CO2e | × 0.00224719 |