Unit Price Calculator

Work out the true price per unit, gram or ounce while you shop. Instantly see whether the bulk pack is actually cheaper.

Is that bulk pack of 6 actually cheaper than buying two packs of 2? Online shopping sites often mask the true cost of items by changing weight formats between listings. This extension gives you an instant pricing breakdown. Type in the total price and the quantity, and get the exact cost per item, per 100g, per kilogram, per pound or per ounce — whichever way you need to see it. FREE FEATURES • Fast price-per-unit maths engine • Ten units built in: items, grams, kilograms, ounces, pounds, millilitres, litres, UK and US fluid ounces, and pints • Converts imperial and metric on the fly, so a label in grams can be compared against one in ounces correctly • Six currencies, and your last calculation is remembered • Works instantly without closing your shopping tab • 100% private and ad-free PREMIUM UPGRADE (£1.99, one off) Unlock the "Compare Side by Side" tray. Save up to three different listings at once and the cheapest is highlighted in green automatically — no mental arithmetic in the aisle. Mixed units are handled properly, so grams and ounces are compared on a level footing rather than side by side as raw numbers. One payment. No subscription, no account, no renewals. PRIVACY Every calculation happens on your own machine and nothing you type is ever transmitted. The extension cannot see the pages you visit — it has no access to any website at all. The only network request it makes is a licence check to extensionpay.com when you open the popup. Payments are handled by Stripe; your card details are never seen or stored by this extension. PERFECT FOR Weekly grocery shops, comparing supermarket own-brand against branded, wholesale and warehouse-club buying, and anyone who has ever stood in an aisle squinting at a shelf label.