Perunit: Unit Price Calculator

Perunit is a unit price calculator for the grocery aisle. Type the shelf price and the size of each pack, and Perunit shows the price per ounce, per kg, per sheet or per item, and which one is the best deal.

Stores make this hard on purpose. The big pack is not always cheaper, the coupon changes the answer, and one brand sells by the ounce while the other sells by the gram. Perunit does the math so you don't have to.

COMPARE ANY SIZES
- Add as many products as you like, not just two.
- The cheapest turns yellow with a BEST DEAL tag. The others show how much more they cost, like +9%.
- A plain sentence tells you the answer: "Costco is 8% cheaper than the priciest option."

MULTIPACKS, TYPED THE WAY YOU SEE THEM
Paper towels come as 12 rolls of 110 sheets. Water comes as 24 bottles of 16.9 fl oz. Type "12 × 110" and Perunit works out the price per sheet.

MIXED UNITS, COMPARED FAIRLY
Ounces against grams, litres against fl oz, pounds against kilograms. Perunit converts everything, then compares price per ounce, price per kg, per 100 g, per litre or whatever unit you pick. Count units too: sheets, rolls, loads, pods, cans, diapers, servings and tablets. Even cubic feet for mulch and soil.

DEALS THAT ACTUALLY COUNT
- Percent off
- Coupons
- Buy N, get M free
- Second item at a discount
- Shipping cost for online orders
The real price after the deal is the one that gets compared.

A PRICE BOOK FOR WHAT YOU BUY OFTEN
Save a comparison and Perunit remembers which store had the best price per unit. Search it next time you shop. Five items are free; watch one short video to add five more, and they stay yours.

MADE FOR THE AISLE
- Works offline. No account, no sign-up.
- Everything saves as you type, so nothing is lost if you close the app.
- Undo when you delete something by mistake.
- Light and dark themes, large clear numbers.
- Choose your currency: $, €, £, ₹ and more.

QUESTIONS PEOPLE ASK
How do I work out which pack is cheaper?
Type the shelf price and the size of each pack into Perunit. This unit price calculator shows the price per unit for each one, marks the cheapest with a BEST DEAL tag and shows how much more the others cost.

Can I compare ounces with grams or litres with fl oz?
Yes. Perunit converts everything first, then compares price per ounce, price per kg, per 100 g, per litre or whatever unit you pick.

How do I compare multipacks, like 12 rolls of 110 sheets?
Type "12 × 110" as the size and Perunit works out the price per sheet.

Does it include coupons and buy one get one deals?
Yes. Percent off, coupons, buy N get M free, a second item at a discount and shipping cost are applied, and the real price after the deal is the one that gets compared.

Can I compare more than two products?
Yes. Add as many products as you like.

Does the unit price calculator work without internet?
Yes. Perunit works offline with no account and no sign-up.

Perunit is a simple price comparison tool that never tracks what you buy. Your comparisons stay on your phone.

Perunit is free and supported by ads. Quick compares are always free and unlimited.

Recent changes:
First release: compare unit prices with multipacks, mixed units and deals, and keep a price book.