Vegan Footprint Calculator. Enter how long you've been vegan — years and months — and choose your preferred unit system (Imperial or Metric). The Vegan Footprint Calculator estimates the total animal lives saved, water conserved, grain saved, forest preserved, and CO₂ emissions avoided based on your vegan duration. Also try the Smog Calculator (Benzo[a]pyrene).
The calculator uses widely cited daily savings statistics: each day as a vegan spares 1 animal life, conserves 1,100 gallons (4,164 litres) of water, saves 40 lbs (18 kg) of grain, preserves 30 sq ft (2.8 m²) of forest, and avoids 20 lbs (9 kg) of CO₂ emissions. Your total days vegan (years × 365 + months × 30) are multiplied by each of these daily figures. Source data originates from research cited by Cowspiracy and similar environmental studies. See also our calculate Your Trip Emissions, Annual Emissions (Your Mode) & CO₂ Saved vs. Solo Car (per trip) — Green Transportation.
After 2 years (730 days) of being vegan, you will have saved approximately 730 animal lives. The calculation is simply 1 animal life per day multiplied by your total days as a vegan. Add extra months to get a more precise figure.
Yes — the cumulative impact of a single person going vegan is substantial. Over just one year, one vegan saves around 365 animal lives, over 400,000 gallons of water, nearly 14,600 lbs of grain, nearly 11,000 sq ft of forest, and over 7,300 lbs of CO₂. Multiplied across millions of vegans, the collective environmental benefit is enormous.
On average, a vegan saves per day: 1 animal life, 1,100 gallons (4,164 litres) of water, 40 lbs (18 kg) of grain, 30 sq ft (2.8 m²) of forest, and 20 lbs (9 kg) of CO₂ compared to a standard omnivore diet. These figures are estimates based on average consumption data and may vary by diet composition and region.
Selecting Imperial displays water in gallons, grain and CO₂ in pounds, and forest in square feet. Selecting Metric converts these to litres, kilograms, and square metres respectively, making it easier for users outside the United States to interpret the results.
Start by replacing animal products one meal or category at a time — swap dairy milk for plant-based alternatives, replace meat with legumes, tofu, or tempeh, and explore vegan versions of your favourite dishes. Many people find a gradual transition more sustainable. Once you commit fully, every single day counts toward the savings shown in this calculator.
This calculator assumes a fully plant-based diet for the entire period entered. If you are vegetarian or only partially plant-based, your actual savings will be lower. You can still use it to estimate the potential impact of going fully vegan for a given time period as a motivational guide.
Vegans eat all plant-based foods including fruits, vegetables, grains, legumes (beans, lentils, chickpeas), nuts, seeds, tofu, tempeh, plant-based milks (oat, almond, soy, coconut), and plant-based meat alternatives. They avoid all animal products including meat, poultry, fish, dairy, eggs, and honey. You might also find our calculate Car vs Bike useful.