Vegetarian vs Meat Diet Cost Calculator

A vegetarian grocery shop is often cheaper than a meat-based one, though the gap depends on your weekly basket, where you live, and how many branded plant-based substitutes you buy. This calculator takes your typical weekly spend on each style, projects the total difference across your chosen time horizon, and runs a parallel future-value calculation showing what that gap could grow to if the difference were invested each month at a chosen return rate.

How to use it

Enter your typical weekly grocery spend on a meat-based shop, the same figure for a vegetarian shop, the time horizon in years, and an assumed annual investment return. The calculator returns the cumulative grocery cost gap, the weekly and annual difference, the future value of investing the difference each month at the rate you set, and which option came out cheaper.

What the inputs mean

Cost gap is the weekly difference multiplied by 52 weeks and then by years. The investment figure assumes the monthly equivalent of the saved difference is invested each month at the chosen annual rate, compounded monthly, over the same horizon. The investment return input is illustrative — actual returns vary year to year, and a single fixed rate is a planning assumption rather than a forecast.

Quick example

With a meat-based weekly spend of 90, a vegetarian weekly spend of 70, a 20-year horizon, and a 7% return assumption, the cumulative grocery cost gap is 20,800 and the same difference invested monthly grows to roughly 45,147. Change any input and the result updates in real time.

What this tool does not capture

The math here is grocery spend only. It excludes restaurant meals, takeaway, delivery, and the cost of any branded meat substitutes that may close or reverse the gap. It also excludes health-related costs, which are personal and hard to project. Use the result as a planning estimate of the grocery line in a budget, not as a complete diet-cost comparison.