Static tool · no sign-in · phone-friendly

Unit Price Checker

Compare groceries, drinks, and household items by actual cost per unit. Great for the classic store aisle question: is the giant one genuinely a better deal, or is the shelf tag lying to me again?

✨ catches fake deals 🧾 keeps the math plain 🛒 built for actual aisle arguments

Starter presets

Drop in a realistic aisle scenario

Fast buttons for common grocery math, each with a quick preview of the kind of answer it produces.

Calculator

Compare up to three options

Mixed measurement families get excluded on purpose. If one thing is sold by weight and the other is sold by count, the math should not get to freestyle.

We auto-pick a sensible default from the items you enter, but you can change it anytime.

Need-based mode

How much do you actually need?

Optional, but useful. Unit price is not always the cheapest checkout total when package sizes are weird.

Quick presets

Tap one when you just need a sane starting point instead of typing from scratch.

Why it’s useful

Simple enough to use in a parking lot, useful enough to keep around.

Mixed-unit conversion

Compare ounces to pounds, milliliters to liters, or count-based items without grabbing a second calculator.

Sale-aware pricing

Pack counts and coupons are built in, so the result reflects what you actually pay instead of the fantasy sticker price.

Need-based totals

See which option is cheapest for the amount you actually need, because the best unit price does not always win the real checkout.

Shelf-tag audit

Optional claimed unit-price inputs help you sanity-check aisle labels against the exact price, pack count, and coupon you entered.

Shareable state

Copy the exact link or a plain-English verdict bundle with the current comparison baked in. Handy for sending “which one should I buy?” debates to somebody else.

Help, trust, and sharing

Here’s how the math works, what stays private, and why two “winners” can both be real.

This thing is intentionally boring in the best way: plain browser math, no login, no backend, and no mysterious “smart shopping” box pretending a dozen is a liquid.

How to use it in 30 seconds

  1. Enter the sticker price, size, unit, and optional pack count for each option.
  2. Add any coupon or discount so the checkout math reflects reality instead of shelf-tag fan fiction.
  3. Use target amount if you need a real quantity and want the cheapest total, not just the prettiest unit price.

Why people can trust the result

  • Mixed measurement families are excluded instead of being fake-converted into nonsense.
  • Coupons come off before unit math, so “sale” actually means sale.
  • Optional shelf-tag checks compare claimed aisle math against the price, pack count, and coupon you entered.
  • Target mode rounds up to whole packages because stores, tragically, refuse to sell 0.43 of a cereal box.
  • Your last comparison stays in this browser unless you deliberately copy a share link.

FAQ

Does it send my prices anywhere?

No. The app is just static files. There is no account, no database, and no server-side calculator quietly collecting your grocery aisle crimes.

Why can the unit-price winner and checkout winner be different?

The best value per ounce is not always the cheapest total at the register. If the biggest pack makes you overshoot your target, a worse unit price can still win the real trip total.

Why did one item get excluded?

Only items in the same measurement family rank together. Weight, volume, and count stay separate on purpose so the math does not freestyle into cursed soup.

What if the shelf tag’s unit price looks wrong?

Enter the shelf tag’s claimed unit price and unit. The card will show whether it looks normal within rounding or noticeably off versus the price, size, pack count, and coupon you entered here.