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Unit Price Calculator

The bigger package isn't always the better deal — compare true price per unit before you decide.

Option A price ($)

Option A quantity

Option B price ($)

Option B quantity

Cheaper option

Option B

Compare two package sizes on a true per-unit basis, not just sticker price.

Option A price/unit: 0.416
Option B price/unit: 0.354

What you entered

Option A price ($): 4.99Option A quantity: 12Option B price ($): 8.49Option B quantity: 24

1
Price per unit — Option A
$4.99 ÷ 12= $0.4158/unit
2
Price per unit — Option B
$8.49 ÷ 24= $0.3538/unit
3
Compare
0.4158 vs 0.3538= Option B is cheaper

Result

Cheaper option: Option B

Option A is $0.41583333333333333/unit and Option B is $0.35375/unit — Option B is the better deal per unit.

Comparing two pack sizes on unit price

Unit price is total price divided by quantity. The cheaper column is whichever has the lower price per unit, regardless of which pack costs less overall.

Option A	Option B	A per unit	B per unit	Cheaper
$2.50 for 500	$4.00 for 1000	0.0050	0.0040	B
$1.20 for 330	$3.50 for 1500	0.0036	0.0023	B
$5.00 for 1	$12.00 for 3	5.0000	4.0000	B
$8.99 for 2000	$4.99 for 1000	0.0045	0.0050	A
$3.00 for 6	$5.00 for 12	0.5000	0.4167	B

The fourth row is the case worth watching: option B is cheaper to buy at $4.99 against $8.99, yet costs more per unit, so the bigger pack wins on value. That is the usual direction, but not always - promotional pricing on small packs regularly beats the bulk option, which is why shelf-edge unit pricing exists and is legally required in many countries. Compare like with like: 500 g against 1 kg is fine, but 500 g against 500 mL is not, since one is weight and the other volume.

Why sticker price alone is misleading

A larger package with a higher total price can still be the worse deal per unit, and 'bulk' pricing doesn't always mean bulk savings — retailers sometimes charge a premium for the larger size specifically because shoppers assume bigger is automatically cheaper.

Match your units before comparing

Make sure both quantities are in the same unit (both ounces, both count, both liters) before comparing — comparing a price-per-ounce against a price-per-count gives a meaningless result.

Frequently asked questions

A 32 oz bottle costs $4.29 and an 18 oz bottle costs $2.69 — which is the better deal?

32 oz at $4.29 = $0.134/oz. 18 oz at $2.69 = $0.149/oz. The larger bottle is about 10% cheaper per ounce. But only buy the bigger one if you'll actually use it all — savings evaporate if half goes to waste.

Why does the store's 'family size' sometimes cost more per unit?

Retailers know shoppers assume bigger = cheaper, so some family-size or bulk packages are actually priced at a higher per-unit cost than the regular size. Always check the unit price on the shelf tag or use this calculator — never assume the larger package is the better value.

How is unit price different from total price?

Total price is what you pay at checkout. Unit price is the cost per single unit of measure (per ounce, per count, per liter). A $6 box of 24 crackers ($0.25 each) is cheaper per unit than a $3 box of 10 ($0.30 each), even though the total price is higher.