Food Waste Calculator
Most people are surprised by how much money they throw away without realising it. This free food waste calculator gives you a personal estimate in under a minute, using the latest figures from WRAP in the UK and the EPA and ReFED in the US. Move four sliders, see your number, and find out what you would save by actually tracking what is in your kitchen.
UK household / year
≈ £1,000
WRAP, 2025
US person / year
≈ $728
EPA, 2025
UK food bought wasted
22%
edible only
CO₂ per kg waste
2.5 kg
FAO lifecycle
Your kitchen
Your result
You throw away
£972
in edible food every year.
With Foodat you'd save
£243/year
That is £1,216 over 5 years, and 681 kg less CO₂.
Based on a 25% reduction, the conservative midpoint of peer-reviewed RCTs on inventory tracking, expiry reminders and meal planning (Soma et al. 2022: 31%; Romani et al.: 24%). Country averages from WRAP, 2025.
Weekly waste
£19
Yearly spend
£4,420
Per person/yr
£486
CO₂/yr
681 kg
What is a food waste calculator?
A food waste calculator is a small online tool that estimates how much edible food your household throws away in a year, and how much that costs you in money and in carbon emissions. It is a sanity check. You probably already feel like you bin too much. This tool tells you, in pounds or dollars, what too much actually means.
The maths is not complicated. It takes your weekly grocery spend, multiplies it across the year, and applies a waste percentage. The interesting part is the comparison. Once you see a real number sitting on the screen, the small habit changes that reduce food waste start to feel worth the effort. For most households we hear from, that is the moment they start using something like Foodat to track what they actually have at home.
Three habits. Up to 30% less waste.
Foodat is built around the three habits peer-reviewed studies show actually work, automated on your phone.
Scan once.
Snap your grocery receipt. Foodat parses every item into your pantry, no typing.
Get reminded.
Heads-up notifications two to three days before anything expires. No more mystery yoghurt.
Cook what you have.
AI recipes built from the ingredients sitting in your kitchen, prioritised by what is about to go off.
How much food does the average household actually waste?
The honest answer is, a lot more than people think. In the UK, WRAP's most recent figures show 6.4 million tonnes of edible food is thrown away by households every year. That works out to roughly 22% of the edible food bought, and around £1,000 per year for an average household of four. The percentage is broadly the same across income brackets, the absolute cash figure is smaller for lower-income households.
In the US the numbers are even larger. The EPA's April 2025 cost-of-food-waste report puts the average at about $728 per person per year, which is around $2,900 for a family of four. ReFED's 2026 Progress on the Plate report estimates 29% of the entire US food supply ends up as surplus, with roughly a third of that surplus coming from households rather than shops, restaurants or farms.
| Metric | United Kingdom | United States |
|---|---|---|
| Edible food bought, wasted | 22% (WRAP, 2025) | ≈ 30% (ReFED, 2026) |
| Cost per household / year | ≈ £1,000 (household of four) | ≈ $2,900 (household of four) |
| Cost per person / year | ≈ £250 | $728 (EPA, 2025) |
| National total | £17 bn / 6.4 Mt edible | $382 bn / 70 Mt surplus |
How to reduce food waste at home
The research is clear about what works. You do not need a perfect system, you need three small habits that quietly compound. Start with the first one and add the others as you go.
- 1
Know what you have before you shop.
Most household food waste starts at the supermarket, by buying something you already own. Take a thirty-second look in the fridge and the cupboards before you write the list. A pantry tracking app means the list lives on your phone and updates itself.
- 2
Plan one or two meals a week around leftovers.
Pick a regular use-up day. Friday-night stir-fry, Sunday-lunch frittata, soup-and-toastie Wednesday. Romani et al. found this single habit cut household food waste by 24%.
- 3
Check use-by dates and eat older first.
FIFO is not just for warehouses. Push older food to the front of the fridge and label leftovers with the date. Apps like Foodat can send a reminder two or three days before anything is about to expire.
- 4
Store food the way it actually wants to be stored.
Bread freezes brilliantly and toasts straight from frozen. Onions hate the fridge, mushrooms hate plastic bags, herbs love a glass of water on the worktop. A few small storage tweaks easily extend life by days.
- 5
Buy smaller, more often, if you can.
Bulk buys are only cheaper when you actually use them. For perishables like leafy greens, dairy and meat, a slightly smaller weekly shop usually beats a giant one. The 'going off before we got round to it' bin is real.
- 6
Use the freezer as a pause button.
Almost anything freezes. Half a tin of beans, leftover rice, the bread heel, ripe bananas for banana bread, half-eaten yoghurt pots. If you cannot eat it today, freeze it and decide later.
The shortcut: Foodat does habits one, two and three automatically. Scan a receipt, get expiry reminders, and get AI recipes built from what you already have. Try it free on iPhone.
How the calculation works
Step 1. Your weekly grocery spend is multiplied by 52 to estimate your annual food spend.
Step 2. The waste percentage you pick is applied to that figure. We pre-fill 22% for UK households (WRAP July 2025: 6.4 million tonnes of edible household food waste out of roughly 29 million tonnes of edible food purchased) and 30% for US households (ReFED 2026; the EPA puts the figure at "over one-third"). Adjust it if you know you are tidier or messier than average.
Step 3. The savings figure assumes a 25% reduction, the conservative midpoint of peer-reviewed interventions. Soma et al. (2022, randomised controlled trial) found 31%. Romani et al. found 24% from meal planning. WRAP's national Love Food Hate Waste programme delivered around 21% over five years. We picked the low end of that range on purpose.
Step 4. CO₂ is estimated at roughly 0.7 kg CO₂e per pound or dollar of edible food wasted, derived from the FAO's Food Wastage Footprint figure of around 2.5 kg CO₂e per kg of food wasted on a lifecycle basis (production, transport and disposal).
Sources: WRAP UK Food Waste & Surplus Key Facts (Jul 2025), ReFED Progress on the Plate (2026), EPA Cost of Food Waste to Consumers (Apr 2025), FAO Food Wastage Footprint, Soma et al., 2022 (RCT, 31% reduction).
Frequently asked questions
- What is a food waste calculator? +
- A food waste calculator is a free tool that estimates how much money your household throws away on uneaten food each year. You enter your country, household size, weekly grocery spend, and how much food you think you waste. The calculator multiplies your weekly spend by 52 to get an annual figure, applies the waste percentage, and shows how much you could save by reducing your waste with simple habits like inventory tracking and expiry reminders.
- How much food does the average household waste? +
- In the UK, an average household of four throws away around £1,000 of edible food every year, about 22% of the edible food they buy (WRAP, 2025; figure restated in WRAP's March 2026 Food Waste Action Week). In the US, the EPA's April 2025 report puts the cost at about $728 per person per year, roughly $2,900 for a household of four, with around 30% of the US food supply going uneaten (ReFED, 2026).
- How accurate is this food waste calculator? +
- The calculator uses the latest published national averages from primary sources (WRAP, ReFED, EPA, FAO). Your personal result will be more accurate the better you know your weekly grocery spend and how much you genuinely throw away. If you have no idea what your waste percentage is, leave it on the country default. Most people slightly underestimate how much they bin.
- How is the calculation done? +
- We multiply your weekly grocery spend by 52 to get annual spend, then apply your waste percentage. The default percentage is the published national average for your country, but you can adjust it based on your own habits. The savings figure assumes a 25% reduction, a conservative midpoint of peer-reviewed studies on households that adopt inventory tracking, expiry reminders and meal planning.
- Why a 25% reduction? Is that realistic? +
- It is the conservative end of the published evidence. Soma et al. (2022, randomised controlled trial) found a 31% reduction in total food waste after a food-literacy intervention. Romani et al. found a 24% reduction from use-up-day plus flexible-recipes meal planning. WRAP's national Love Food Hate Waste programme delivered around 21% reduction over five years. 25% sits comfortably inside that range, and we would rather under-promise than overstate it.
- Where does the CO₂ figure come from? +
- The FAO's Food Wastage Footprint study estimates roughly 2.5 kg CO₂e per kg of food wasted on a full lifecycle basis (production, transport and disposal). Combined with the average value of edible food per kg, that works out to about 0.7 kg CO₂e per pound or dollar of food binned. We round conservatively.
- Is the food waste calculator free? +
- Yes, completely free. No sign-up, no email required, no data stored. We built it because the Foodat app exists to fix exactly the problem this calculator measures.
- What is the easiest way to actually reduce food waste at home? +
- Three habits do most of the work. First, know what is in your kitchen, an inventory you can see at a glance prevents accidental duplicate buying. Second, track expiry dates so you eat older items first instead of forgetting them. Third, plan meals around what you already have rather than buying for new recipes. Foodat automates all three on iPhone.
- How does Foodat reduce food waste? +
- Three ways. One, scan a grocery receipt and your pantry inventory builds itself in seconds. Two, Foodat reminds you two to three days before anything is about to expire so it does not get forgotten at the back of the fridge. Three, the recipe AI suggests meals using ingredients you already have, prioritising whatever is closest to going off.
- Does the calculator work for the US and the UK? +
- Yes. Toggle between the two at the top. Currency, default weekly spend, and the average household waste percentage all switch based on country, sourced from WRAP for the UK and ReFED plus EPA for the US.