Meal Planning Savings Calculator

Meal planning means deciding the week's meals before shopping rather than after. The saving comes from two places that behave quite differently: less food bought and then thrown away, and fewer evenings that end in an order because nothing in the kitchen adds up to a meal. Household food waste is measured worldwide, and the UNEP Food Waste Index found per capita household waste to be more consistent across countries than had been assumed, which makes it a household habit rather than a local quirk.

Neither part of the saving is knowable in advance from a general figure, which is why the calculator asks rather than assumes. The grocery side depends on how much currently gets thrown out, and the takeaway side on how often an evening ends in an order and what one costs locally. Food is worth measuring carefully either way: on Eurostat's figures, food and non-alcoholic beverages are the second-largest category of EU household spending, behind only housing.

How to use it

Enter the weekly grocery saving you would realistically achieve, the number of takeaway orders a month that planning replaces, the average cost of one, and the number of weeks a year the habit actually holds. That last box matters more than it looks, since it is the difference between a habit kept all year and one kept most of it.

What the result means

The annual total is the two streams added together, and the breakdown underneath shows which one is doing the work. At the defaults the grocery side is 864 and the takeaway side 1,080, so the more visible saving is also the larger one here, though that flips as soon as the weekly grocery figure rises above 22.50.

A worked example

With the defaults, a weekly grocery saving of 18, three fewer takeaway orders a month at 30 each, and 48 weeks of planning: 18 times 48 is 864, and 3 times 12 times 30 is 1,080, giving 1,944.00 a year or 162.00 a month.

What moves the number most

Each input sits in one of the two products, so a change to any of them moves its own stream rather than the whole total. Adding 2 to the Weekly Grocery Saving adds 96 a year. One more avoided order a month adds 360. The takeaway side is the more responsive of the two at these defaults, because a unit there carries a month of cost while a unit on the grocery side carries a week of saving.

The formula behind this

Grocery saving multiplied by weeks planned, plus takeaway reductions multiplied by twelve months and by the average cost of one order. The two halves never interact, which is why the breakdown can be read as two separate figures.

Where the estimate can drift

The figure assumes both habits hold at the level entered, and the weekly grocery saving is the softer of the two numbers, since it is a difference against a counterfactual shop that never happened. Takeaway counts are easier to check against a bank statement. Re-running the calculation after a couple of months, with observed figures rather than intended ones, gives a steadier answer than the first attempt.