SShopWithSherySmart shopping tools

Shopping toolkit

Cost per Use & Value

Measure value over time: cost per wear, use, day, serving, refill and household consumption.

25 calculators17 supporting shopping guides
Shrinkflation CalculatorCalculate shrinkflation using the quantity or usage that actually matters.Package Size Reduction CalculatorCalculate package size reduction using the quantity or usage that actually matters.Hidden Price Increase CalculatorCalculate hidden price increase using the quantity or usage that actually matters.Same Price Smaller Pack CalculatorCalculate same price smaller pack using the quantity or usage that actually matters.Old Size vs New Size CalculatorCalculate old size vs new size using the quantity or usage that actually matters.Effective Inflation CalculatorCalculate effective inflation using the quantity or usage that actually matters.Price Increase per Unit CalculatorCalculate price increase per unit using the quantity or usage that actually matters.Cost per Wear CalculatorCalculate cost per wear using the quantity or usage that actually matters.Cost per Use CalculatorCalculate cost per use using the quantity or usage that actually matters.Cost per Year CalculatorCalculate cost per year using the quantity or usage that actually matters.Cost per Month CalculatorCalculate cost per month using the quantity or usage that actually matters.Cost per Day CalculatorCalculate cost per day using the quantity or usage that actually matters.Cost per Hour of Use CalculatorCalculate cost per hour of use using the quantity or usage that actually matters.Appliance Cost per Use CalculatorCalculate appliance cost per use using the quantity or usage that actually matters.Tool Cost per Use CalculatorCalculate tool cost per use using the quantity or usage that actually matters.Furniture Cost per Year CalculatorCalculate furniture cost per year using the quantity or usage that actually matters.Shoes Cost per Wear CalculatorCalculate shoes cost per wear using the quantity or usage that actually matters.Clothing Cost per Wear CalculatorCalculate clothing cost per wear using the quantity or usage that actually matters.How Long Will This Package Last CalculatorCalculate how long will this package last using the quantity or usage that actually matters.Days Supply CalculatorCalculate days supply using the quantity or usage that actually matters.Servings per Package CalculatorCalculate servings per package using the quantity or usage that actually matters.Uses per Container CalculatorCalculate uses per container using the quantity or usage that actually matters.Monthly Usage CalculatorCalculate monthly usage using the quantity or usage that actually matters.Annual Quantity Needed CalculatorCalculate annual quantity needed using the quantity or usage that actually matters.Shrinkflation History CSV AnalyzerAnalyze package price and size history to quantify shelf-price, package-size and unit-price changes.

Guides for this shopping decision

What shrinkflation means in unit-price termsWhat shrinkflation means in unit-price terms. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate shrinkflationHow to calculate shrinkflation. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How a smaller package creates a hidden price increaseHow a smaller package creates a hidden price increase. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to compare an old package with a new smaller packageHow to compare an old package with a new smaller package. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate effective unit-price inflationHow to calculate effective unit-price inflation. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate cost per wearHow to calculate cost per wear. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.Why a cheaper item can cost more per useWhy a cheaper item can cost more per use. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate cost per use before buyingHow to calculate cost per use before buying. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate how long a package will lastHow to calculate how long a package will last. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to estimate annual quantity neededHow to estimate annual quantity needed. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate servings per packageHow to calculate servings per package. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to calculate uses per containerHow to calculate uses per container. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to plan refill timing from daily useHow to plan refill timing from daily use. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to compare durable products by cost per yearHow to compare durable products by cost per year. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How unit pricing helps identify shrinkflationHow unit pricing helps identify shrinkflation. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How to compare cost per use with upfront priceHow to compare cost per use with upfront price. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.How much a 10 percent package reduction really costsHow much a 10 percent package reduction really costs. Use the relevant ShopWithShery calculator to verify the math with your own prices, quantities and terms.

Sources and verification

These sources support the consumer-shopping principles discussed on this page. Your own retailer's current offer and policy still control the actual transaction.

NIST SP 1181 — Unit Pricing Guide, 2025 EditionNational Institute of Standards and Technology · verified 2026-08-09Official U.S. best-practice guide for unit pricing; updated May 20, 2026.Uniform Unit Pricing: Tools for Consumers to Fight ShrinkflationNational Institute of Standards and Technology · verified 2026-08-09Official consumer explanation of unit pricing and shrinkflation.