Bigger packs aren’t always cheaper. Enter the price and quantity of two or more products and this tool works out the price per unit for each and highlights the best value — the honest comparison supermarket shelf labels don’t always make easy. Everything runs in your browser.
Enter each product’s price and quantity in the same unit (all grams, all litres, or all pieces).
Price per unit: —
Price per unit: —
Enter the price and quantity of at least one item.
How it works
For each item the unit price is simply the price divided by the quantity. Enter quantities in the same unit — all in grams, or all in litres, or all as pieces — and the tool compares like with like, marks the cheapest per unit, and shows how much cheaper it is than the most expensive option.
This is where “family size” marketing meets arithmetic. A 500 RSD four-pack works out to 125 per unit, while a single item at 120 is actually cheaper per unit despite the smaller total — exactly the kind of thing the per-unit view exposes at a glance.
Practical examples
Which pack of coffee is cheaper?
A 200 g bag at 360 RSD is 1.80 per gram; a 500 g bag at 850 is 1.70 per gram. The bigger bag wins here — by about 5.6% per gram — but only the per-unit figure makes that obvious.
The bigger pack that isn’t a deal
A single yoghurt at 120 RSD for 1 piece beats a 4-pack at 500 RSD (125 per piece). The multipack looks generous but costs more per unit — 4% more.
Detergent by the litre
Compare a 2 L bottle at 900 (450 per litre) with a 3 L bottle at 1,290 (430 per litre). Enter both and the 3 L is flagged as the better value.
Frequently asked questions
What is unit price?
The price of one unit of the product — per gram, per litre, per piece — found by dividing the total price by the quantity. Comparing unit prices, rather than total prices, is the only reliable way to tell which package is genuinely cheaper.
Do the quantities need to be in the same unit?
Yes. The tool divides price by the number you enter, so a fair comparison needs the same unit throughout — compare grams with grams, or litres with litres. Mixing 500 g against 1.5 kg would give a misleading result unless you convert first (e.g. 1.5 kg = 1500 g).
Is a bigger pack always cheaper per unit?
No — that’s exactly the assumption this tool checks. Multipacks and “family size” packaging are sometimes priced higher per unit than the small version. Always compare the per-unit figure rather than trusting that bigger means better value.
How many products can I compare?
From two up to five at once. Add a row for each option on the shelf; the cheapest per unit is highlighted and labelled, with the percentage saving against the priciest.
What if two items have the same unit price?
On an exact tie the first one entered is marked as best, and the saving shows as 0%. In practice you can then choose on other grounds — brand, freshness, how much you’ll actually use.
Does it account for discounts or loyalty prices?
It compares whatever prices you enter, so type the actual shelf price you would pay — after any discount. To work out a discounted price first, use the discount calculator, then bring the result here.
Does the currency or unit label matter?
No — the math is just price divided by quantity, so it works in any currency and any unit. The result is “price per unit” in whatever you entered; there is no currency conversion.
Are the prices I compare stored anywhere?
No. Everything is computed in your browser. Nothing is uploaded, and analytics never sees the prices or quantities.
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