Business calculators
Unit Price Calculator
Compare two pack sizes by converting each total into a price per unit. Your inputs stay in this browser.
Live calculator
Enter your numbers
What this calculator measures
Unit price answers which pack is cheaper on a shared basis — per bottle, per milliliter, per seat — when the shelf totals look incomparable. Use it before you print a wholesale list, write an ad for a bundle, or decide a warehouse pack is a bargain.
The metric is misleading when the quantities are not the same kind of unit, or when unused product is not free. $1.25 per pad sounds better than $1.50 until the 20-pack dries out and you throw eight away. It is also misleading as a profit number. The cheaper unit can be the low-contribution SKU that trains buyers to skip the kit you needed to clear rent.
The common manual mistake is to compare pack totals, or to mix ounces with counts. A $22 four-pack versus an $11 single is not 'twice as much for twice as many' if the bottles are 500 ml and 750 ml. Convert both to the unit the buyer actually uses — milliliters, servings, sheets — then divide. People also forget to put shipping or a case-only discount on the pack that actually incurs it.
Priya's accessory pack is $36 for 4 pieces ($9.00 each). A competitor sells 2 for $28 ($14.00 each). She looks cheaper and the ad wins. Customers buy the accessory and skip her $120 desk kit. Contribution on the accessory after a $11 cost is $25; contribution on the kit after $78 is $42. A week that shifts ten kit buyers to the accessory is $170 less contribution before ads. Unit price explained the click. It did not explain the month.
Formula
Inputs and variables
- Pack A price
- Enter the money amount used by this formula.
- Pack A quantity
- Enter the value used by this formula.
- Pack B price
- Enter the money amount used by this formula.
- Pack B quantity
- Enter the value used by this formula.
How to use the calculator
- Choose a display currency when money fields are present.
- Enter values that cover the same period, scope, and currency.
- Review the result, formula, and worked example before using the estimate in a decision.
- Change one assumption at a time to understand what drives the result.
Worked example
- 1Pack A is $36 for 4 pieces ($9.00 each). Pack B is $28 for 2 pieces ($14.00 each).
- 2Pack A has the lower unit price.
- 3If A is a low-contribution accessory, the cheaper unit can still be the worse SKU to advertise.
How to interpret the result
The lower unit price is better value only when quality, usable quantity, waste, and contribution are comparable. Use the same unit on both sides. Then check whether winning that comparison is the sale you needed.
Common mistakes and limits
- Comparing pack totals instead of a shared unit.
- Mixing weight, volume, and count in one comparison.
- Leaving shipping or case discounts off only one side.
- Treating the cheaper unit as the more profitable SKU.
Frequently asked questions
Is the bigger pack always cheaper per unit?
No. Compare the two unit prices. Warehouse packs can lose once you include shipping, a club membership, or product you will not use before it expires. Run both totals through the same unit before you buy the larger one.
Can I compare a 750 ml bottle with a 500 ml four-pack?
Yes, if you convert both to the same unit first — milliliters or ounces — then divide price by that quantity. Comparing $11 versus $22 without converting size is how a 'cheaper' single loses on the buyer's calculator.
Should I advertise the SKU with the lowest unit price?
Only if that SKU also contributes enough to justify the ad. A cheap accessory can win the comparison and starve the kit that covers rent. Use unit price to explain the click, then check contribution on the SKU the click actually buys.
Do I include tax and shipping in unit price?
Include whatever the buyer actually pays to take the pack home if you are comparing what they will compare. Leave tax out if both packs are taxed the same and you only care about list price. Be consistent on both sides.
What if two packs have the same unit price?
Then the decision is quality, waste, cash tied up, and which SKU you wanted to sell. The calculator will report a tie. It will not tell you whether a 20-pack that sits for six months is worse working capital than a 12-pack that turns.