Work out food waste percentage instantly with clear inputs, formula shown and shareable results.
Waste percentage is discarded weight over purchased weight, and the value discarded is that weight times the purchase price per kilogram. Annualising a weekly figure is what makes waste visible: six kilograms a week at three per kilogram is over nine hundred a year straight into the bin.
Waste percentage
waste % = wasted weight / purchased weight x 100
Annual cost
annual = wasted weight x cost per kg x 52
waste % = wasted weight / purchased weight x 100. Waste percentage is discarded weight over purchased weight, and the value discarded is that weight times the purchase price per kilogram.
Annualising a weekly figure is what makes waste visible: six kilograms a week at three per kilogram is over nine hundred a year straight into the bin.
Enter food purchased, food thrown away, cost per kg. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.