Smart shopping math
Compare the real cost before you buy.
Free tools for unit prices, discounts, shipping, cashback, subscriptions and shrinkflation. Enter your own numbers and see which option actually offers better value.
No account · No product sales · Calculations run from the numbers you enter
Compare different sizes on the same unit basis so a larger package or bigger discount cannot hide the real price.
Open deal comparison →Start with the task
What are you trying to work out?
Shopping workflows
Tools grouped by the decision you need to make
Compare prices using the same unit so package size cannot hide the better value.
Explore unit price →Compare DealsCompare two or more offers by delivered cost, unit price, quantity and practical tradeoffs.
Explore compare deals →Discounts & CouponsWork out sale prices, stacked discounts, coupons, multibuy offers and effective savings.
Explore discounts & coupons →Checkout & ShippingCalculate delivered cost, tax, fees, shipping thresholds and checkout tradeoffs.
Explore checkout & shipping →Cashback & RewardsTranslate cashback, points, store credit and loyalty rewards into real purchase value.
Explore cashback & rewards →Subscriptions & MembershipsCompare recurring purchases, membership fees, refill timing and break-even points.
Explore subscriptions & memberships →Cost per Use & ValueMeasure value over time: cost per wear, use, day, serving, refill and household consumption.
Explore cost per use & value →Returns & WarrantiesCalculate return deadlines, restocking costs, warranty dates and keep-versus-return economics.
Explore returns & warranties →Why ShopWithShery exists
Sticker price is only one part of a deal.
NIST describes unit pricing as a tool consumers can use to compare value across different package quantities, including in ecommerce, and its current guidance discusses shrinkflation and consistent unit-price presentation. The FTC separately advises comparison shoppers to consider total cost, including shipping, delivery, taxes and other fees. ShopWithShery turns those principles into practical calculators you can use with the exact offer in front of you.