Shrink vs Packaging
Detect shrinkflation by comparing size and price per unit between old and new.
About Shrink vs Packaging
Comparing the amount and the unit price between an old and a new package reveals whether you are paying more per unit, which is shrinkflation. Packages that get smaller while the price stays the same are effectively a price rise, and only unit price exposes it.
Formula
Shrink vs Packaging
Unit price change = (new unit price - old unit price) / old x 100
- unit price
- Price per unit of measure
Worked example
With the default values below, Shrink vs Packaging returns Old Unit Price of $0.1559. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Old amountminimum 0
- 32
- Old price
- 4.99
- New amountminimum 0
- 27
- New price
- 4.99
Results
- Old Unit Price
- $0.1559
- New Unit Price
- $0.1848
- Amount Change
- -15.63%
- Unit Price Change
- 18.52%
Step by step
- 1Values used
- 2Shrink vs Packaging
- 3Old Unit Price= 0.1559
- 4New Unit Price= 0.1848
- 5Amount Change= -15.63
- 6Unit Price Change= 18.52
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Shrink vs Packaging calculated?
Unit price change = (new unit price - old unit price) / old x 100 Comparing the amount and the unit price between an old and a new package reveals whether you are paying more per unit, which is shrinkflation.
Why does Shrink vs Packaging matter?
Packages that get smaller while the price stays the same are effectively a price rise, and only unit price exposes it.
What values do I need to enter?
This calculator takes 4 inputs: Old amount, Old price, New amount, New price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.