Compare up to 10 products by unit price to find the true best deal. Supports any unit — oz, lb, kg, ml, L, count, or custom. Stop overpaying for smaller packages.
| Product | Price | Quantity | Price/Unit | vs Best |
|---|
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The biggest package is not always the best deal. The cheapest sticker price is not always the cheapest per unit. Retailers use package sizes, pricing psychology, and shelf placement to make it hard to compare. The solution is dead simple: divide the price by the quantity. That gives you the price per unit — the only number that tells you the true cost. This guide shows you how to use unit pricing to save hundreds of dollars per year on everyday purchases.
Scenario 1: Grocery Store Cereal. Sarah compares three boxes of the same cereal: 12oz for $3.49 ($0.291/oz), 18oz for $4.99 ($0.277/oz), 24oz for $5.99 ($0.250/oz). The 24oz box is the best deal per ounce. But the store has a $1 coupon for the 12oz box: ($3.49 - $1.00) / 12 = $0.208/oz — suddenly the smallest box wins. Always recalculate after coupons. Use our Discount Calculator to apply coupons before comparing.
Scenario 2: Costco vs Regular Grocery. Marcus compares laundry detergent. Regular store: 50oz for $8.99 ($0.180/oz). Costco: 150oz for $19.99 ($0.133/oz). Costco saves $0.047/oz. Over a year using ~600oz: savings = $28.20. But Costco costs $65/year for membership. If he only buys detergent there, it is not worth it. He needs multiple products to justify the membership. Use our Percentage Calculator to find the percentage savings.
Scenario 3: Business Supply Ordering. Priya orders printer paper for her office. Vendor A: 500 sheets for $7.99 ($0.016/sheet). Vendor B: 2,500 sheets for $32.99 ($0.013/sheet). Vendor C: 5,000 sheets for $59.99 ($0.012/sheet). Vendor C is cheapest per unit, but ties up $60 and takes 6 months to use. Vendor B offers the best balance of unit price and cash flow. At 500 sheets/month, Vendor B supplies 5 months. Use our Break-Even Calculator to model bulk purchasing decisions for your business.
Scenario 4: The Shrinkflation Trap. David notices his favorite chips are still $4.49 but the bag went from 10oz to 8.5oz. Old unit price: $0.449/oz. New unit price: $0.528/oz. That is a 17.6% hidden price increase disguised as no price change. Shrinkflation is rampant — always check the unit price, not just the sticker price. Use our Markup Calculator to see how much the effective markup increased.
💡 Key insight: The average American household spends about $5,700/year on groceries. Studies show unit price comparison shoppers save 10-15% annually. That is $570-$855/year — just by checking which package is actually cheaper per unit. Over 30 years at 7% returns, that saved money invested grows to $57,000-$86,000. Unit pricing is a wealth-building habit.
| From | To | Multiply By |
|---|---|---|
| pounds (lb) | ounces (oz) | × 16 |
| kilograms (kg) | pounds (lb) | × 2.205 |
| gallons (gal) | ounces (fl oz) | × 128 |
| liters (L) | ounces (fl oz) | × 33.814 |
| liters (L) | milliliters (ml) | × 1,000 |
| kilograms (kg) | grams (g) | × 1,000 |
Use our Percentage Calculator to find the percentage difference between unit prices and determine how much you actually save. For budgeting your grocery spending, try our Budget 50/30/20 Calculator.
| Check shelf labels | Unit price shown |
| Coupons change the math | Recalculate after |
| Bulk only if you use it | Waste = loss |
| Watch for shrinkflation | Same price, less product |
| Store brand vs name brand | Often 30-50% cheaper |