CO2 Breathing Emission Calculator

Find the CO2 exhaled by a group of people.

Daily CO2 1,000

Yearly CO2 (tonnes) 365

Formula: total = people * kg per day

Step-by-step with your numbers:

1. Values used:

2. Number of people = 1,000

3. CO2 per person per day = 1

5. Daily CO2 = Number of people x CO2 per person per day = 1,000 x 1 = 1,000

6. Yearly CO2 = 365tonnes

Did we solve your problem today?

Humans exhale about 1 kg of CO2 per day just by breathing.

The math behind it

daily CO2 = number of people x exhaled CO2 per day. This is part of the natural carbon cycle, not fossil emissions.

1000 people exhale about 365 tonnes of CO2 per year.

Is this the same as fossil CO2?

No — breathing CO2 comes from food, which plants recently absorbed, so it is carbon-neutral.