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Plant-Based Nudge Calculator

How It Works

Enter a few details about your dining setting: meals served per day, days open per year, and customers per day. Then pick one nudge from the Top 5 Nudges to see your results. The calculator estimates how many meals could shift from animal-based to plant-based over a year, plus the carbon emissions avoided.

Next, take that emissions number to the EPA’s Greenhouse Gas Equivalencies Calculator to translate it into terms people instantly understand — cars taken off the road, homes powered for a year, or trees planted.

 

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Plant-Based Nudge Calculator

Who This Is For

If you’re pushing for better food systems, this calculator is yours.

  • Food service operators: dining halls, cafeterias, coffee shops, venues, and hospitals ready to shift their menus
  • Advocates and organizers: making the case to decision-makers and funders
  • Students and researchers: studying nutrition, sustainability, behavioral science, or food systems

 

“An immensely valuable, simple tool to help people see what they can accomplish, and how they can achieve their goals.”

–Cass R. Sunstein, Harvard University, BFF Board of Advisors, Co-Author of Nudge


Questions

What are the five plant-based nudges in this calculator?

The calculator covers:

Top 5 Plant-Based Nudges

1. Plant-Based Defaults: Make plant-based food the default option with animal products available by request only.  Includes Oat Milk by Default for coffee shop beverages.

2. Climate-Friendly Ratios: Make plant-based foods the most plentiful by increasing to a 2:1 ratio of plant-based to animal-based proteins and entrees. (or 67%)

3. Prime Placement: Make plant-based foods the most visible by placing them front and center.

4. Subtle Substitutions: Swap animal ingredients, like egg or dairy, for plant-based alternative ingredients across your recipes.

5. Tasty Titles & Descriptions: Update plant-based menu titles and descriptions to sound delicious to increase consumption.

Each draws on the best research available, including peer-reviewed field trials, though the evidence base is deeper for some than for others. The methodology report lists more information on how the calculations were made.

Do I have to remove meat from the menu?

No. All plant-based nudges keep meat available by request only. The research shows you can shift the meal mix substantially without restricting anyone’s freedom of choice.

Can I use this for a single event?

Yes. Enter event-level numbers, like a 300-person conference or a two-day summit, or annual figures for ongoing dining operations. The math scales either way.

Will plant-based nudges cost more?

Usually not, and often the opposite. NYC Health + Hospitals made plant-based meals the default for patient lunch and dinner menus and saved roughly $0.59 per meal, totaling about $470,000 in 2025. A Bryant Research analysis of a London university caterer found that plant-based recipes cost 30% less per portion than meat dishes, averaging £1.49 per portion compared with £2.31.

Your numbers will depend on your contracts and sourcing. Check your procurement data.

Can I combine nudges in the calculator?

Not yet. Almost every trial in our database tests one nudge at a time, so we don’t have enough data on how they interact. Run the calculator on your strongest single nudge and treat that as your baseline. We’ll add stacking as the research catches up.

How do I implement a plant-based nudge?

Start with our free virtual Nudge Training sessions. We walk through the top 5 nudge strategies you can apply right away in a dining setting.

→ Register for a free Nudge Training

Can BFF help us model nudges for our organization?

Sometimes. The calculator is built for anyone to get a fast estimate. If you’re working at scale, get in touch, and we’ll help where capacity allows.

→ Contact us about modeling at scale

Go Deeper

Acknowledgments

This calculator was researched, developed, and written by Björn Ólafsson, Research Specialist Consultant at Better Food Foundation.

Thank you to the following experts for their advice and insights used to develop this tool: Dr. Sophie Attwood (Behaviour Global), Imogen Clemett (Humane World for Animals), Kenjin Chang (Greener by Default), and Cass R. Sunstein (Harvard University).