Many supermarkets voluntarily provide unit pricing as a consumer service.
A few cities, counties and states require unit pricing, though unit pricing is not required by federal law. In stores providing unit pricing, look for special shelf tags below each product. Various supermarkets use slightly different styles of unit price tags, but the information basically remains the same. Larger sizes are usually more economical than smaller sizes, but not always. Again, consider quality, nutrition, convenience, family tastes, economy and storage space.