Pesticide Impact Calculator

The Environmental Impact Quotient (EIQ) is a formula developed by researchers at Cornell University (Kovach, Petzoldt, Degni, and Tette) to help growers assess the relative environmental and health impacts of pesticide options. It produces a unitless, standardized rating that allows direct comparison between different pesticides and application strategies, making it easier to choose lower-impact options.

The Field Use EIQ is calculated by multiplying the active ingredient's EIQ value by the percentage of active ingredient in the formulation and the application rate (in lbs of active ingredient per acre), then dividing by 100. This gives a unitless rating standardized to lbs/acre that reflects the actual environmental impact of a specific application. Our calculator also accounts for the area treated and number of applications to provide a seasonal total.

The full EIQ formula breaks down into three equally weighted components: the Farm Worker component (reflecting risks to people who apply or work near the pesticide), the Consumer component (reflecting dietary and residue risks to end consumers), and the Ecological component (reflecting risks to beneficial insects, birds, fish, and other non-target organisms). Each component contributes roughly one-third of the overall EIQ score.

EIQ scores are relative and unitless — there is no universal 'safe' threshold. Lower scores indicate a lesser overall environmental impact compared to higher-scoring alternatives. For context, many biopesticides and reduced-risk products score below 20, while some conventional broad-spectrum insecticides can exceed 100. The value of EIQ is in comparing options for the same application scenario rather than judging any absolute number.

The Cornell University EIQ database (maintained at eiq.cornell-ipm.org) provides EIQ values for hundreds of active ingredients. The database follows FAIR data principles — it is open, versioned, and citable with persistent identifiers. You can look up any registered active ingredient there and enter its EIQ value into this calculator.

Our calculator handles common unit conversions automatically. If your label specifies ounces, pints, quarts, or gallons per acre, select the appropriate unit and the calculator converts it to lbs-equivalent for the formula. Note that liquid formulation densities vary — the calculator uses standard water-equivalent density (8.34 lbs/gal) as an approximation; for highly concentrated liquids, consult the product label for specific gravity.

Yes — that is one of the primary use cases for the EIQ. Calculate the Field Use EIQ for each pesticide option at your planned rate and area, then compare the total scores as well as the individual farm worker, consumer, and ecological components. This helps identify which option poses the lowest risk for your specific situation and priorities.

Yes. The seasonal Field Use EIQ multiplies the per-application EIQ by the number of applications during the growing season. Reducing the number of applications — through integrated pest management (IPM) practices, scouting, and economic thresholds — is one of the most effective ways to lower your seasonal environmental impact score, even without changing the pesticide product.