Water Footprint Calculator Methodology

GRACE’s Water Footprint Calculator (WFC) provides a snapshot of how your daily activities and routines impact your water use. The results, reported as your water footprint, are meant to be an estimate that can help you better understand your habits and behaviors and their contribution to your overall water footprint.

Assumptions: The calculations used in the WFC are an estimate. The data is the latest available at the time of creation of the calculator. In some cases, we have used data from studies that looked at personal water use based on individual behaviors. In other cases, we took national data and created statistical averages and values to calculate individual water use. The research pointed out that there is a lack of consistent, high quality water use data collected in this country, so please view your results with this in mind. The value of the Water Footprint Calculator lies in its ability to help users understand how they use water and how they can use less.

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Some of these questions do not technically fall within the guidelines for conducting a proper water footprint assessment. This is because we ask questions about both withdrawals and consumption (to learn more about the difference, read this post). All questions have been included to get people to think about their water use.

Average values shown in the spreadsheet results of the calculator are subject to rounding. Values under 1.0 gallon are shown as “0.”

Our calculator is based on US data and units only. Use the Water Footprint Network’s calculator for international data and metric units.