Unit Price Calculator
Compare two products by their price per unit (gram, ml, etc.) and find out which is the cheapest option. Free.
Free · No sign-up · Runs in your browser · Last reviewed November 2026
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About Unit Price Calculator
Compare two products by their price per unit (gram, ml, etc.) and find out which is the cheapest option. Free. Unit Price Calculator is a free tool from the Finance category of RoviDev. Apply standard financial formulas so you make better decisions with your money. The results are an estimate and may vary depending on commissions, taxes or the conditions of your entity.
How to use Unit Price Calculator
- Open Unit Price Calculator in RoviDev (you don't need to install anything or register).
- Enter the required data in the tool form.
- Press the button and see the result instantly on the screen.
Comparing unit prices: a grocery example and the traps to avoid
Enter the price and the quantity for two products and the calculator divides price by quantity for each, shows both unit prices to four decimals, and says which is cheaper (or if they tie). The quantity must be in the same unit for both products.
Example: a 32 oz jar of pasta sauce costs $4.99 and a 48 oz jar costs $6.99. The first is $4.99 / 32 = $0.1559 per oz and the second $6.99 / 48 = $0.1456 per oz. The larger jar is cheaper by about 1.0 cents per ounce, which on one jar is roughly 0.50 dollars saved compared with buying the smaller size repeatedly.
- Convert to the same unit first. A 1 lb package is 16 oz, and a 1 quart bottle is 32 fl oz. The weight converter and volume converter help.
- Do not mix weight and volume. Ounces on a scale and fluid ounces are different measures.
- Cheapest per unit is not always the best buy. A big pack you cannot finish before it spoils, or that is on a limited sale, may cost more in the end.
- Check multi-pack counts: 12 rolls with 200 sheets each should be compared by total sheets, not by roll.
- Shelf labels are a useful cross-check, but stores compare using different units from one product to the next, so calculate your own.
For savings percentages try the percentage calculator.
Frequently asked questions
What is the Unit Price Calculator for?
Compare two products by their price per unit (gram, ml, etc.) and find out which is the cheapest option. Free. You just have to enter the data and you get the result instantly, without leaving the page.
Is the Unit Price Calculator free?
Yes. Unit Price Calculator is 100% free and does not require registration. The service is maintained thanks to advertising.
Are the data I enter saved?
No. The calculation is done in your browser; We do not send or store your data on any server.
Can I use it from my mobile?
Yes. The tool is responsive and works on mobile, tablet and computer from any browser.
Are the calculations accurate?
It uses standard formulas and gives you a very close estimate, but the final result may vary depending on commissions, taxes or the conditions of your entity.
Is the bigger size always cheaper per unit?
No. Sales, coupons and shrinking package sizes can make a smaller package cheaper per ounce, which is why it is worth calculating.
What unit should I use for the quantity?
Any unit works as long as both products use the same one. Ounces, grams, sheets, loads or count are all fine.