Smaller pack
Bulk pack
Smaller pack
$0.87 / 100 g
Bulk pack
$0.90 / 100 g
Adjusted for the share you expect to use. 3.0% more expensive per unit
The smaller pack is actually cheaper per unit. Bulk is not always a bargain.
Quick answer: Buying in bulk is cheaper only when the per-unit discount beats what you waste. Our calculator compares cost per unit between pack sizes and adjusts for the share you'll realistically use before it spoils - if the spoilage-adjusted price is lower, the bulk pack wins.
Evergreen method
Compare usable cost, not package price
The durable comparison is price per common unit adjusted for the share you will actually use.
Formula
usable unit cost = price ÷ (quantity × usable share)Reproducible steps
- 1.Convert every option to the same unit.
- 2.Estimate the share your household will use before spoilage.
- 3.Choose the lower usable unit cost only if storage and cash flow also work.
Data note — Evergreen model: The formula works with your own inputs and does not depend on a specific price or year.
FAQ
Questions, answered
Is buying in bulk actually cheaper?
Only when the per-unit discount beats what you'll realistically use before it spoils. Bulk pricing is often lower per unit, but wasted food erases the savings.
When is buying in bulk not worth it?
When you can't use or store the full quantity before it spoils or expires - this is most often an issue with fresh produce, dairy, and other perishables.
Does food go bad before you can use up bulk purchases?
It can, especially with perishables. This calculator factors in a spoilage/waste estimate so the comparison reflects what you actually use, not just the sticker price.
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