Unit Price Calculator
Option A
$
Option B
$
Cheaper OptionOption B is cheaper
Option A — Unit Price$0.50 / unit
Option B — Unit Price$0.40 / unit
Savings vs Pricier20%
The Unit Price Calculator divides each item price by its quantity or package size to reveal the true cost per unit, then compares two options head to head. Enter the price and size of Option A and Option B, and the tool flags whichever is cheaper per unit and shows the percentage you save versus the pricier choice. It is the fast way to cut through "bigger box" marketing at the shelf.
Formula
unitPrice = price ÷ quantity; savings% = (higher − lower) ÷ higher × 100
- price
- Total price paid for the package
- quantity
- Number of units or size of the package
- higher / lower
- The larger and smaller of the two unit prices
How it works
- Enter the price and the quantity (or size) for Option A and Option B — use the same unit for both, such as ounces, grams, sheets, or count.
- Each price is divided by its quantity to give a cost per unit, rounded to four decimal places so small per-unit differences are still visible.
- The lower per-unit figure is marked as the cheaper option, and the savings percentage is taken against the more expensive unit price.
Worked example
A 10 oz jar costs $5.00 and a 20 oz jar costs $8.00 — which is the better buy?
- Option A unit price = 5.00 ÷ 10 = $0.50 per oz.
- Option B unit price = 8.00 ÷ 20 = $0.40 per oz.
- Savings = (0.50 − 0.40) ÷ 0.50 × 100 = 20%.
Option B is cheaper at $0.40 per oz, saving 20% per unit.
Frequently asked questions
- Do both options need the same unit of measure?
- Yes. Enter both quantities in the same unit — both in ounces, both in grams, or both as a count — otherwise the per-unit prices are not comparable. Convert one size first if the labels differ.
- What counts as the "quantity"?
- It is whatever you want the price spread across: total weight, volume, sheet count, number of items, or servings. The calculator simply divides price by that number to get a price per single unit.
- How is the savings percentage calculated?
- The savings is measured against the more expensive option, so it answers "how much less per unit does the cheaper one cost." A 20% figure means the cheaper unit price is 20% below the pricier one.
- Why might the bigger package not be cheaper per unit?
- Retailers sometimes price larger sizes at a premium or discount smaller promotional packs. Comparing the cost per unit, rather than the sticker price, is the only reliable way to spot which is the real deal.