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Step 1:   Begin by naming your project and selecting your state and county


Please Select a State

Step 2:   Select the class of conservation practices that best describes the practice you would like to evaluate

Please Select a County

Step 3:   Select a NRCS Conservation Practice Standard and a Practice Implementation that best describes your system. You may add multiple practices. If you would like to add a practice under a different class of practices, return to Step 2.

Conservation Practice Standard (CPS):

Please Select a Class

Conservation Practice Implementation:

    Please select a Conservation Practice Standard

Step 4:   Enter the acreage associated with each conservation practice you selected

Please Select One or More Implementations

How are your carbon sequestration and greenhouse gas emission reduction estimates calculated?

Emission reduction coefficients were largely derived using a sample-based approach and model runs in COMET-Farm, which utilizes USDA entity-scale greenhouse gas inventory methods. Coefficients were generalized by multi-county regions defined by USDA Major Land Resource Areas. Emissions estimates represent field emissions only, including those associated with soils and woody biomass as appropriate, and do not include off-site emissions, such as those from transportation, manufacturing, processing, etc. More information on quantification methods can be found in the COMET-Planner Report

Each emission reduction is calculated using the following equation:

Emission reduction = Area (acres) * Emission Reduction Coefficient (ERC)

Recommended Use of COMET-Planner:

This evaluation tool is designed to provide generalized estimates of the greenhouse gas impacts of conservation practices and is intended for initial planning purposes. Site-specific conditions (not evaluated in this tool) are required for more detailed assessments of greenhouse gas dynamics on your farm. Please visit COMET-Farm if you would like to conduct a more detailed analysis.

Contact Us

Please contact us via the help desk widget or send an email to with any questions.


Welcome to COMET-Planner 3.0!

A new version of COMET-Planner was released September 2022. This version includes a number of updates:
  • Updated graphical user interface with enhancements for accessibility, such as keyboard navigation, larger text sizes, better contrast, and Spanish translation.
  • The version of DayCent used in the prior version of COMET-Planner (2.1) simulated soils to 20 cm depth; the current version simulates soil to 30 cm depth. An overview of differences between versions is summarized here: COMET Versions Comparison – September 2022
  • Incorporation of a new irrigation dataset
  • New practices were added for adding cover crops (CPS 340) to long-term no-tilled cropland