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CO2 Capture / Carbon Intensity Calculator

Calculate gross and net CO2 emissions with carbon capture and CO2e per unit output

Free CO2 and carbon intensity calculator using 40 CFR Part 98 emission factors. Enter fuel type and consumption to calculate gross CO2, CH4, N2O, and total CO2 equivalent emissions in metric tons per year. Model carbon capture efficiency and calculate carbon intensity per MWh, barrel, or ton of product. Supports AR4, AR5, and AR6 global warming potential values.

Pro Tip: If you are evaluating 45Q tax credits for carbon capture, the credit applies to the net CO2 captured and permanently stored or utilized. As of 2024, the credit is $85/ton for geologic storage and $60/ton for utilization. At those numbers, even 50% capture on a large combustion source can pencil out. Run the numbers with this calculator to get a first estimate of captured tonnage.

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CO2 Capture / Carbon Intensity Calculator
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How It Works

  1. Select Fuel Type

    Choose from natural gas, diesel, gasoline, fuel oil, propane, coal (4 types), kerosene, or wood/biomass. Heat content and emission factors load automatically.

  2. Enter Fuel Consumption

    Input annual fuel usage in the appropriate units (10^6 scf for gas, gallons for liquids, short tons for coal/wood) or in MMBtu/year.

  3. Set Carbon Capture (Optional)

    If modeling CCS, enter the capture efficiency percentage. The calculator shows both gross and net CO2 emissions.

  4. Enter Plant Output (Optional)

    For carbon intensity, enter annual output in MWh, barrels, gallons, or tons of product. The calculator computes kg CO2e per unit of output.

  5. Select GWP Standard

    Choose IPCC AR4 (regulatory default for EPA), AR5 (UNFCCC/GHG Protocol), or AR6 (latest science) global warming potentials for CH4 and N2O.

Built For

  • Ethanol plants and refineries evaluating 45Q carbon capture tax credit potential
  • Utilities calculating carbon intensity per MWh for LCFS or clean energy credits
  • Corporate sustainability teams computing Scope 1 GHG emissions for ESG reports
  • Engineers comparing fuel-switching scenarios for CO2 reduction
  • Project developers modeling CCS economics with different capture rates

Assumptions

  • Emission factors follow 40 CFR Part 98 Subpart C methodology.
  • Fuel compositions match standard published heat content and carbon content values.
  • Carbon capture efficiency applies uniformly to CO2 only (CH4 and N2O are not captured).
  • Biomass CO2 is reported but may be treated as biogenic under regulatory frameworks.

Limitations

  • Does not account for process emissions or non-combustion CO2 sources.
  • Grid emission factors for Scope 2 are not included (see GHG Reporting Consolidator).
  • Does not model CCS energy penalty or parasitic load on plant output.

References

  • 40 CFR Part 98, Subpart C - General Stationary Fuel Combustion Sources
  • 40 CFR Part 98, Tables C-1 and C-2 - CO2, CH4, and N2O Emission Factors
  • IPCC Fifth Assessment Report (AR5) - Global Warming Potentials
  • IRC Section 45Q - Carbon Oxide Sequestration Credit
  • EPA Center for Corporate Climate Leadership - GHG Emission Factors Hub

Frequently Asked Questions

Carbon intensity measures the amount of CO2 equivalent emitted per unit of useful output (e.g., kg CO2e per MWh of electricity, per barrel of oil processed, or per ton of product manufactured). It allows comparison of emissions performance across different facilities or technologies regardless of absolute size. Lower carbon intensity means more output per unit of emissions.
GWP (Global Warming Potential) values are updated with each IPCC assessment report. AR4 (2007): CH4=25, N2O=298. AR5 (2014): CH4=28, N2O=265. AR6 (2021): CH4=27, N2O=273. EPA mandatory reporting under 40 CFR Part 98 still uses AR4 values. Most voluntary frameworks (GHG Protocol, CDP, SBTi) use AR5. The differences are relatively small for combustion sources.
Under most regulatory and voluntary frameworks, CO2 from biomass combustion is reported separately as biogenic CO2 and is often excluded from net emission totals (treated as carbon neutral if sustainably sourced). However, CH4 and N2O from biomass combustion are still included in GHG totals. EPA MRR requires reporting biogenic CO2 but separates it from fossil totals.
Disclaimer: CO2 emission factors are from 40 CFR Part 98, Subpart C, Tables C-1 and C-2. GWP values per the selected IPCC assessment report. Carbon capture calculations are simplified estimates; actual CCS performance depends on technology, operating conditions, and verification protocols. This calculator provides planning-level estimates and should not be used for regulatory compliance without professional review.

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