Water Footprint Calculator
Water Footprint is evaluated from Beef Servings per Week, Pork/Lamb Servings per Week and Chicken/Turkey Servings per Week. The calculation reports Virtual Water per Day, Annual Virtual Water and Largest Water Contributor.
Results
About the Water Footprint Calculator
The Water Footprint Calculator is a valuable tool for individuals looking to understand the impact of their diet on water consumption. It helps users calculate the amount of virtual water used in their daily food choices, going beyond the water they use for drinking, cooking, and hygiene. By using this calculator, individuals can make informed decisions about their diet and reduce their water footprint. For example, a person who consumes a lot of beef may be surprised to learn that it requires significantly more water to produce than chicken or turkey. This knowledge can help them adjust their diet to reduce their water usage.
### History of the Water Footprint Calculator
The concept of water footprinting was first introduced by Dr. Arjen Hoekstra, a professor of water management at the University of Twente in the Netherlands, in the early 2000s. Hoekstra developed the water footprint concept as a way to measure the amount of water used to produce goods and services. The water footprint of a product is the total volume of water used to produce it, including the water used for growing, processing, and transporting the product. Over time, the concept of water footprinting has evolved to include not just the direct water usage but also the indirect water usage, such as the water used to produce animal feed or to generate electricity. The Water Footprint Calculator is based on this concept and uses data on the water footprint of different foods to estimate an individual's daily water usage.
### The Science Behind the Calculations
The Water Footprint Calculator uses a simple formula to estimate an individual's daily water usage based on their food choices. The formula is: Virtual Water per Day = (Beef Servings per Week x Water Footprint of Beef) + (Pork/Lamb Servings per Week x Water Footprint of Pork/Lamb) + (Chicken/Turkey Servings per Week x Water Footprint of Chicken/Turkey). The water footprint of each food item is based on data from various sources, including the Water Footprint Network and the United States Department of Agriculture. For example, the water footprint of beef is approximately 1,000 gallons per pound, while the water footprint of chicken is approximately 500 gallons per pound. The calculator also estimates the annual virtual water usage and identifies the largest water contributor in the user's diet.
### Real-Life Application and Examples
Let's consider an example of how the Water Footprint Calculator can be used in real life. Suppose we have a user named Sarah who wants to understand the impact of her diet on water consumption. Sarah eats beef twice a week, pork once a week, and chicken three times a week. She enters these values into the calculator, along with her other food choices, and gets the following results: Virtual Water per Day = 1,500 gallons, Annual Virtual Water = 547,500 gallons, and Largest Water Contributor = Beef. These results tell Sarah that her beef consumption is the largest contributor to her water footprint, and that she uses approximately 1,500 gallons of virtual water per day. Based on these results, Sarah may decide to reduce her beef consumption or choose more water-efficient food options. For instance, she could replace one beef serving per week with a chicken serving, which would reduce her virtual water usage by approximately 500 gallons per day. By using the Water Footprint Calculator, Sarah can make informed decisions about her diet and reduce her impact on the environment.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: Virtual water = sum of (servings x gallons per serving), normalized to daily. Beef: 450 gal/4 oz serving. Pork: 150 gal. Chicken: 115 gal. Dairy: 55 gal/8 oz serving. Plant foods + background use: ~100 gal/day baseline. Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: Average American: 4 beef servings/week, 2 pork, 4 chicken, 2 dairy/day, 7 eggs/week, 2 coffees/day
Inputs
With Beef Servings per Week = 4, Pork/Lamb Servings per Week = 2, Chicken/Turkey Servings per Week = 4 and Dairy Servings per Day = 2 as the stated inputs, the result is Virtual Water per Day = 703 gallons/day, Annual Virtual Water = 256,491 gallons/year and Largest Water Contributor = Beef (257 gal/day). Each value corresponds to the declared output fields.
Example 2: Vegan diet: no meat/dairy/eggs, 2 coffees/day
Inputs
With Beef Servings per Week = 0, Pork/Lamb Servings per Week = 0, Chicken/Turkey Servings per Week = 0 and Dairy Servings per Day = 0 as the stated inputs, the result is Virtual Water per Day = 174 gallons/day, Annual Virtual Water = 63,510 gallons/year and Largest Water Contributor = Beef (0 gal/day). Each value corresponds to the declared output fields.
Example 3: Flexitarian: 1 beef/week, 3 chicken, 1 dairy/day, 5 eggs/week, 3 coffees/day
Inputs
With Beef Servings per Week = 1, Pork/Lamb Servings per Week = 1, Chicken/Turkey Servings per Week = 3 and Dairy Servings per Day = 1 as the stated inputs, the result is Virtual Water per Day = 439 gallons/day, Annual Virtual Water = 160,183 gallons/year and Largest Water Contributor = Beef (64 gal/day). Each value corresponds to the declared output fields.
Example 4: Heavy meat diet: 7 beef servings/week, 3 pork, 2 dairy/day, 14 eggs/week, 1 coffee
Inputs
With Beef Servings per Week = 7, Pork/Lamb Servings per Week = 3, Chicken/Turkey Servings per Week = 0 and Dairy Servings per Day = 2 as the stated inputs, the result is Virtual Water per Day = 867 gallons/day, Annual Virtual Water = 316,559 gallons/year and Largest Water Contributor = Beef (450 gal/day). Each value corresponds to the declared output fields.
Common Use Cases
- Calculate the water footprint of your diet
- Compare water footprint of different foods
- Understand total water consumption beyond household use