How to Check a Smaller Package at the Same Price
A package can shrink while the shelf price stays the same. It feels like nothing changed, but the same shelf price can still mean a higher unit price.
This guide focuses on the math: compare the old package and new package by unit price. Use the shrinkflation calculator to enter the old package and new package values.
📦 The Golden Rule
Do not compare the old and new package by shelf price alone.
Compare the old unit price against the new unit price.
🧮 The 10-Second Formula
unit price = price / package size
unit price increase = (new unit price - old unit price) / old unit price
⚖️ The Comparison
| Version | Price | Package size | Unit price | What changed |
|---|---|---|---|---|
| Old package | $4.00 | 16 oz | $0.2500 per oz | Baseline |
| New package | $4.00 | 14 oz | $0.2857 per oz | About 14.3% higher per ounce |
The price did not move, but the smaller package increased the unit price.
How to Use the Calculator
The dedicated shrinkflation calculator is built for old-package vs new-package checks.
Enter:
- Old package: price $4.00, size 16 oz
- New package: price $4.00, size 14 oz
The calculator shows both unit prices and the percent increase.
⚠️ Common Shrinkflation Price Traps
The Same Price Trap
Same price does not mean same value if the package size changed.
The Unit Mismatch Trap
Compare ounces with ounces, grams with grams, and fluid ounces with fluid ounces.
The Front Label Trap
Front labels may look similar even when the net quantity changed.
✅ Your 10-Second Shrinkflation Cheat Sheet
- Find the old price and size.
- Find the new price and size.
- Calculate both unit prices.
- Compare the new unit price against the old one.
- Watch for unit changes on the label.
Related calculators
Use these when package size or unit type changed.
Next guide
If the package size changed and the price changed too, compare the percent increase directly.