Everyday Life / Shopping

Unit Price Calculator

Calculate and compare unit prices for two options using weight, volume, or item count.

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Opening calculator...

How to use Use it in four checks

Enter compare by, unit, option a cost and option a quantity using the units, labels, and choices shown on the form.

Check the assumptions so the result matches the situation you want to model.

Review the result panel and breakdown together so the headline number has context.

Use the breakdown table to see which inputs are driving the answer.

Formula steps How Bitneer gets the result

Start with compare by, unit, option a cost and option a quantity; numeric entries must be valid before the calculator returns a result.

Apply the formula: Unit price = cost / (quantity × packages); savings = absolute difference between unit prices.

Show best value, option a unit price and option b unit price in the result panel with the matching breakdown rows.

Round the display value while keeping the assumptions and example visible for review.

Formula How the formula works

U_{A} = \frac{C _{A}}{q _{A} \times n _{A}}

U_{B} = \frac{C _{B}}{q _{B} \times n _{B}}

Savings = ∣ U_{A} - U_{B} ∣

The calculator divides each option's total price by its total quantity, using the same unit basis for both products. The lower unit price is marked as the better value, and the per-unit difference shows the savings.

C_A,C_B: Option costs Total shelf price for each option.
q_A,q_B: Package quantities Weight, volume, or item count in each package.
n_A,n_B: Packages Number of packages or bundles included in each option.
U_A,U_B: Unit prices Cost per selected comparison unit.

Assumptions What this calculator assumes

Both options use the same basis and units.

Discounts are included in price if relevant.

Tax is not added separately.

Example

Two package sizes

Two package sizes returns Option A with the current formula and default assumptions.

Expected result: Option A

Outputs What this calculator returns

Best value
Option A unit price
Option B unit price
Savings per unit

FAQ Quick answers

What should I choose for the unit?

Choose the unit printed on both products, such as ounces, pounds, liters, or items. Both options should use the same basis.

How do multi-packs work?

Quantity is the amount in one package, and packages/items is how many packages are included in the offer.

Does this include tax?

Only if you include tax in the entered price. The calculator compares the prices exactly as entered.