List what you threw out this week and roughly how much of each. I will price it and tell you what it adds up to over a year.
Why the annual number is the one that matters
A single bag of spinach that goes slimy costs about three dollars, which is nothing. Multiplied by fifty-two weeks, if you buy spinach every week and throw half of it away, it is nearly eighty dollars a year on spinach alone.
That is the whole trick. Nobody reacts to three dollars. Everybody reacts to two thousand. The tool does the multiplication for you, because doing it in your head is exactly why the problem stays invisible.
What usually dominates the total
| Category | Why it costs more than you think |
|---|---|
| Fresh herbs | Sold in bunches far bigger than any recipe needs, and they die in three days |
| Bread | Cheap per loaf, but most households throw out part of one every week |
| Soft fruit | Expensive per kilo and it ripens faster than anyone can eat it |
| Bagged salad | Priced per bag, and half the bag is usually the answer |
| Dairy | Yoghurt tubs, cream and soft cheese all get opened and abandoned |
| Meat | The highest cost per kilo, so a single forgotten pack outweighs a week of vegetables |
| Leftovers | Already cooked, so you paid for it twice: once to buy, once to cook |
The four changes that made the biggest difference to mine
- I stopped buying bagged salad. It was the single worst offender, and a whole lettuce lasts three times as long and costs less.
- I put the herbs in water on the windowsill instead of the fridge drawer. Basil, parsley and coriander last a fortnight instead of four days.
- I froze bread the day I bought it and toasted from frozen. No more half-loaves going mouldy.
- I moved the leftovers to the front of the fridge shelf where I can see them. Sounds trivial. It cut my leftover waste by more than half.
The honest limits of this estimate
This is an estimate from typical supermarket prices, not a reading of your receipts. If you shop at a discount grocer, your figure will be lower. If you buy a lot of organic or specialty produce, it will be higher.
Treat the annual number as an order of magnitude rather than a precise figure. It is accurate enough to tell you which three items are costing you the most, and that is the part that changes what you do.
Doing it properly for a fortnight
If you want a real number rather than an estimate, keep a note on your phone for two weeks. Every time something goes in the bin, write down what it was and roughly how much. Do not try to price it as you go, just note it.
At the end of the fortnight, put the list into the tool. Two weeks of real data is far more useful than a month of guessing, and by then you will have started to notice the pattern yourself.
I did this exercise on my own bin for the first time about two years ago. I listed everything I had thrown out that week, guessed the quantities, and added it up.
It came to about forty dollars. In one week. That is over two thousand dollars a year, and I had genuinely believed I was careful with food.
The reason it is so easy to miss is that food waste never appears as a line item. It is spread across dozens of small decisions, none of which feels expensive at the time. Pricing it properly is the only way to see it.