Unit price
calculator
The bigger pack is not always cheaper. Enter the price and size of two options to see the cost per unit and which one actually wins.
Prefer a physical calculator?
A few solid picks. As an Amazon Associate, Calculate.to earns from qualifying purchases, at no extra cost to you.
OSALO Desktop Calculator
Extra-large 12-digit LCD, giant buttons, solar + battery, the classic office desk workhorse.
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Helix Oxford Scientific
240-function scientific calculator for KS3–KS4 maths, with hard cover. Exam-friendly, plastic-free packaging.
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Casio fx-83GTCW+
The UK classroom-standard scientific calculator (also in pink), allowed in most UK exams.
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ROATEE Construction Calc
Feet-inch-fraction engineering calculator for carpenters, framers and contractors on site.
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How to compare fairly
Unit price is simply price divided by size, whether that size is grams, millilitres, sheets or count. Put both options in the same unit and the lower price per unit is the better value, regardless of pack size or a tempting bigger number.
When cheaper per unit is not the answer
Per-unit price finds the mathematical best value, but buy what you will actually use: a cheaper large pack is false economy if half of it spoils. Keep the sizes in matching units, grams with grams, and the comparison holds.
Unit price FAQ
Any, as long as both products use the same one: grams with grams, millilitres with millilitres, or count with count.
No. As long as both prices are in the same currency, the lower price per unit is the better deal.
Compare in pairs: check A against B, then the winner against C, and so on.
Multi-buys and large packs are not always discounted; sometimes the small size is on offer, which is exactly what unit pricing reveals.