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About this tool
Compare price per unit across different pack sizes and brands to find which option is genuinely cheaper.
Unit Price Comparison Calculator converts competing pack sizes to a single common unit — price per kg, per litre or per piece — so you can tell instantly which shelf option is actually cheaper. Enter price, pack size and how many packs a combo deal contains, and it ranks every option and shows how much more you pay per unit for the others. Built for grocery runs, online-store combos and bulk-buying decisions where the label maths is deliberately hard to do in your head.
Open Unit Price Comparison Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Grams, kilograms, ounces, pounds, millilitres, litres, fluid ounces and gallons all normalise to the same base before comparison.
A separate packs field means combo deals like 3 x 750 g are priced correctly instead of being treated as a single unit.
The cheapest option is highlighted and every other option shows exactly what percentage more it costs per unit.
Unit price = total price divided by total quantity, where total quantity is pack size multiplied by the number of packs in the deal. The result is then scaled to a familiar unit such as per kilogram or per litre.
No. Retailers regularly price mid-size or promotional packs below the largest one, and multipacks are often the most expensive per unit. That is exactly the case this calculator is designed to catch.
Not reliably. Weight and volume are different measures and the conversion depends on the product's density, so the calculator keeps weight, volume and count as separate modes.
Only when you will use the whole pack. For perishables, storage-limited items or products you are trying for the first time, waste from an unfinished large pack can easily cancel out the per-unit saving.
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