Shopper utility
Unit price comparator
Enter what you pay, the size, quantity and free items for up to four options — the tool normalizes everything to per-100g, per-100ml or per-piece prices and marks the real extra each option costs versus the best.
| Option | You pay | Effective total | Unit price | vs best |
|---|
“vs best” shows how much more this option costs than buying the same effective quantity at the lowest unit price — the real extra cash you hand over for choosing a bigger pack or a weaker offer.
How the comparison works
Every option is normalized to the same ruler: weight to price per 100 g, volume to price per 100 ml, counted goods to price per piece. Effective quantity = size × (quantity + free items), so a buy-one-get-one halves the per-unit price of a single pack, and a jumbo pack has to beat that on the same basis to be a real deal. The comparison needs the same kind of unit across options — grams vs kilograms is fine, grams vs millilitres is not.
What is not counted
Shipping, coupons you have not applied, points/cashback and freebies of a different spec are outside the number — put the coupon-adjusted amount into “You pay” and treat different-spec gifts as a bonus, not part of the math.
Frequently asked
How do I enter a buy-one-get-one offer?
Free items count units of the same size: for a 500g BOGO, enter size 500g, qty 1, free items 1 — the effective total becomes 1000g. Buy-2-get-1 is qty 2 + 1 free.
The freebie is a different-size sample — now what?
Free items are converted at the same spec, so different-size samples stay outside the math. Treat them as a bonus or convert them into equivalent units of this row's size yourself.
Sticker price or coupon price in "You pay"?
Enter what you actually pay — the after-coupon amount. Points and cashback are non-cash rebates; keep them out of the paid figure and count them as a bonus instead.
Can I mix grams with kilograms, or ml with litres?
Yes — weight units (g/kg) and volume units (ml/L) convert automatically. But weight and volume can't be compared: 500g vs 500ml means different densities, so the tool asks you to keep one kind of unit.
What does "vs best" mean?
Every option is re-priced at the lowest unit price for the same effective quantity — this column is the actual extra cash you pay for picking that option, e.g. a bigger pack with a worse unit price.
Further reading
Google Home Speaker gets first discount since June launch · I Shop for a Living, and These 24 Early Black Friday Deals Are Worth Getting Ahead Of