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CO2 Breathing Emission Calculator

Convert an entered breathing scenario into CO₂ gas volume and mass for a selected duration.

Published

Enter values below

—

Fill in the highlighted fields to see your result.

breaths/min
L/breath
%
min
g/L

A transparent worksheet using measured values and explicit user-entered scenario factors.

Results update as you type.

Arithmetic scenario only. Verify measurements, product data, and source applicability for your use.

Worked example

breathingRate: 12 · tidalVolume: 0.5 · co2Fraction: 4 · duration: 60 · co2Density: 1.842 · densityBasis: 1.842 g/L at 25 °C, 1 atm · provenance: Physiology source v1, density from gas tables · uncertainty: ±10% on physiology and density values

Result: 26.52 g CO₂

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CO2 Breathing Emission Calculator

Convert an entered breathing scenario into CO₂ gas volume and mass for a selected duration.

Inputs and method

CO₂ volume = breaths/min × litres/breath × CO₂ fraction × minutes. Mass = volume × the entered gas density.

All empirical factors, rates, percentages, clearances, product yields, and model values shown as inputs are scenario values supplied by you. Their source or measurement basis appears beside the inputs and result. Units remain visible, calculations use unrounded values, and rounding occurs only for display or a whole-package ceiling.

Interpreting the result

Breathing values and the temperature/pressure density basis are user assumptions. The result is not a personal footprint or medical estimate.

Treat scenario ranges as sensitivity ranges, not confidence intervals. Check the factor’s version, geography, population or product, system boundary, and date before using the result. A finite arithmetic result does not establish code compliance, certification, safety, forecast accuracy, or model validity.

Validation and rounding

The calculator rejects blank required factors, invalid numeric, prohibited negatives, impossible relationships, and unsupported modes. No malformed value silently selects another branch. Continuous outputs use the precision displayed in the result; package quantities round up only after waste is applied.

Worked example

At 12 breaths/min, 0.5 L/breath, 4% CO₂, and 60 min, volume is 14.40 L. At 1.842 g/L, mass is 26.52 g CO₂.

Frequently asked question

Is this a personal carbon-footprint estimate? No. It is gas-volume and density arithmetic under the entered physiology and temperature/pressure basis. For scenario-style footprint estimates in other areas, see the Meat Footprint Calculator, Flight Emissions Calculator, and Home Energy Efficiency Calculator.

Sources

  • U.S. EPA, “Overview of Greenhouse Gases” — current web edition; Carbon Dioxide section, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.
  • IPCC, “AR6 Working Group I: The Physical Science Basis” — 2021 report landing page; Summary and report-scope passages, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.
  • FAO, “Tackling Climate Change Through Livestock” — 2013 report; executive-summary system-boundary passages, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.

Compare CO2 Breathing Emission Calculator with related tools

All comparisons →
CO2 Breathing Emission vs Flight EmissionsCompare the CO2 breathing emission and flight emissions calculators: exhaled CO2 volume and mass from ventilation assumptions versus flight CO2 from passenger distance, emission factors, and an optional radiative-forcing multiplier.CO2 Breathing Emission vs Meat FootprintCompare converting a breathing scenario into CO2 gas volume and mass with estimating the carbon footprint of meat servings from a lifecycle factor, and why the two CO2 numbers answer different questions.CO2 Breathing Emission vs Tree BenefitsCompare the CO2 breathing emission and tree benefits calculators: exhaled CO2 volume and mass from a breathing scenario versus annual tree benefits scaled from entered per-tree model outputs.

Frequently asked questions

How is the CO2 volume calculated?
CO2 volume is breaths per minute times liters per breath times the CO2 fraction times minutes. At 12 breaths per minute, 0.5 liters per breath, 4% CO2, and 60 minutes, the volume is 14.40 liters.
How is the mass calculated?
Mass is the gas volume multiplied by the entered gas density. At a density of 1.842 g per liter, the 14.40 liter example becomes 26.52 g of CO2.
Is this a personal carbon-footprint estimate?
No. It is gas volume and density arithmetic under the physiology and temperature or pressure basis you enter. The breathing values and the density basis are user assumptions, and the result is not a personal footprint or a medical estimate.

Sources

  • Overview of Greenhouse Gases

    primary · Aug 10, 2026

    Supports: CO2 as a greenhouse gas and its atmospheric-role context; the calculator supplies no footprint coefficient.

    — U.S. Environmental Protection Agency (EPA)

  • AR6 Working Group I: The Physical Science Basis

    primary · Aug 10, 2026

    Supports: Climate-science context for CO2 (physical science basis) and the report-scope boundary of the worksheet.

    — IPCC

  • Tackling Climate Change Through Livestock

    secondary · Aug 10, 2026

    Supports: System-boundary context for emissions accounting; no entered coefficient comes from this source.

    — Food and Agriculture Organization of the United Nations (FAO)

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CO2 Breathing Emission Calculator updated at

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