Try the Grocery Price Comparison Calculator
Free unit price calculator. Compare two or more products by price and size to see the true cost per unit (per 100g, per litre.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Your input
The actionA real example, step by step
Real data entered into the Grocery Price Comparison Calculator, one screenshot per step. Nothing is mocked up.
Open the tool
The Grocery Price Comparison Calculator opens ready to use, nothing to install or sign up for.
Enter your data
Real input used here: Product name Brand A; Price ($) 4.5; Package size 750.
Press Add product
The Grocery Price Comparison Calculator shows the result straight away, below the same form.
What is the Grocery Price 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.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Grams, kilograms, millilitres, litres, ounces, pounds or item count.
Add as many items as you want to compare.
Best value highlighted instantly.
Update a price or size and see the result update live.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
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.
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