Grocery Price Comparison Calculator
Work out which size or brand is really cheaper per unit · free, no signup
See Grocery Price Comparison Calculator in action
Free Unit Price / Grocery Comparison Calculator
A bigger pack is not always the better deal, and store shelf labels do not always make the per-unit price obvious or use the same units to compare. Add two or more products with their price and package size (grams, kilograms, millilitres, litres, ounces, pounds or just a count of items), and this calculator works out the true cost per unit for each one and highlights the cheapest.
It is built for the everyday grocery decision — is the 3-pack or the 6-pack cheaper per item, is the store brand or the big brand better value per 100g — and updates instantly as you adjust prices or sizes, so you can compare as many products as you like side by side.
Key features
Any unit
Grams, kilograms, millilitres, litres, ounces, pounds or item count.
Unlimited products
Add as many items as you want to compare.
Automatic ranking
Best value highlighted instantly.
Instant recalculation
Update a price or size and see the result update live.
How to use it
- Add each product's price and package size.
- Choose the unit each is sold in.
- Read the cost per unit for each product.
- See which one is highlighted as the best value.
Worked example
Example
Brand A: $4.50 for 750g ($6.00/kg). Brand B: $7.80 for 1.5kg ($5.20/kg) → Brand B is the better value despite costing more upfront.
Who uses this tool
Grocery shoppers
Decide between pack sizes and store versus name brands.
Bulk buyers
Check whether buying in bulk is really cheaper per unit.
Budget planners
Compare recurring purchases to find consistent savings.
Tips for the best results
- Always compare using the same unit (both per 100g, or both per litre) — the calculator converts automatically.
- Check for sale prices and loyalty discounts, which change the real price paid.
- Remember perishables may go to waste before a large pack is used — value depends on use, not just price.
- Recheck occasionally, since unit prices change with promotions and inflation.
Common mistakes to avoid
- Assuming the larger pack is automatically cheaper per unit — it is not always true.
- Comparing products sold in different units without converting first.
- Ignoring spoilage or storage limits when choosing a large 'better value' pack.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
How is unit price calculated?
Price divided by quantity, converted to a common unit such as per 100g, per litre or per item.
Why is the bigger pack sometimes more expensive per unit?
Pricing is set by the retailer or brand and does not always scale down proportionally with size.
Can I compare items sold in different units?
Yes, convert both to a shared unit (for example grams) and the calculator handles the comparison.
Does this account for sales tax?
No, enter the price you actually pay including any tax if you want tax-inclusive comparisons.
Is this only for groceries?
No, use it for any priced-by-size product — cleaning supplies, pet food, printer ink and more.
Is my data saved?
No, it recalculates live in your browser and nothing is stored or sent anywhere.