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Which Purchase Is the Better Deal?

Which purchase is the better deal?

Enter two prices and sizes and see which costs less per unit, by how much, and what price would make them equal.

One Click Answers · Which Purchase Is the Better Deal?
oneclickanswers.com/which-purchase-is-the-better-deal · Printed

About this tool & how to use it

What it does

Compare two products or sizes by what each really costs per unit after discounts, coupons, shipping, tax and waste, and see the price at which the other would match.

How to use it

Enter the price and size of each option. Both must be the same kind of unit, such as ounces and pounds.
Open "More costs and options" to add a discount, coupon, shipping, sales tax or the share you expect to go unused for either option.
Optional: enter how much you plan to buy to see what the difference adds up to.
Press "Get a detailed answer" for the full breakdown, charts, side-by-side scenarios and a plain-language explanation of how the answer was worked out.

Option A name (optional)

Option A: price ($)

The price of one package, before any discount you enter below.

Option A: size

Option A: unit

Option B name (optional)

Option B: price ($)

Option B: size

Option B: unit

Both options must be the same kind of unit (for example weight and weight). Ounces and pounds are fine together.

How much you plan to buy (optional, in Option A's unit)

Shows what the difference per unit adds up to over what you will actually buy.

More costs and options

Option A: discount (%)

Option A: coupon ($)

Option A: shipping ($)

Option A: sales tax (%)

Option A: share you expect to go unused (%)

Food that spoils, a size you cannot finish. The cost is spread over only what you use.

Option B: discount (%)

Option B: coupon ($)

Option B: shipping ($)

Option B: sales tax (%)

Option B: share you expect to go unused (%)

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Assumptions

Prices, discounts, coupons, shipping and tax are the ones you enter; the page does not know current store prices.
The cost per unit is shown in Option A's unit.
Left out: quality, brand, freshness, storage space, shelf life, cashback, rewards and memberships.
Everything you enter, including any income or budget, is worked out in your browser and is never sent anywhere or saved.

Printed from oneclickanswers.com. Results are estimates based on what was entered; see the assumptions above.

How it works

Each price is built the way a checkout is: the sticker price, less any discount and coupon, plus tax and shipping. The result is divided by the amount you expect to use, after converting both sizes to one unit.

The option with the lower cost per unit is named; percent differences compare against the higher cost. If the two are within half a percent they are called about the same.

The match price is the highest price, to the cent, at which the pricier option would cost no more per unit than the other.

The waste table shows how the answer changes if you do not use all of the bigger pack. The page never tells you what to buy.

Formulas and details

Checkout = (price - discount - coupon) + tax + shipping.
Cost per unit = checkout / (size x (1 - unused share)), in one common unit.
Percent difference = (higher - lower) / higher.
Match price = the highest price at which the pricier option's cost per unit is no more than the other's.

Assumptions

Prices, discounts, coupons, shipping and tax are the ones you enter; the page does not know current store prices.
The cost per unit is shown in Option A's unit.
Left out: quality, brand, freshness, storage space, shelf life, cashback, rewards and memberships.
Everything you enter, including any income or budget, is worked out in your browser and is never sent anywhere or saved.

Example

Input: Option A: $7.49 for 24 oz. Option B: $11.49 for 40 oz.

Result: Option B has the lower cost per oz: $0.287 compared with $0.312, about 8% less. Option A would match at $6.89.

Questions

Is the bigger size always the better deal?

Not always. A bigger size often costs less per unit, but only if you use it. The waste table shows how not finishing it changes the answer.

Can I compare ounces with pounds?

Yes. Any units of the same kind (weight, volume, length, area or count) can be compared.

What does "about the same" mean?

The two costs per unit are within half a percent of each other, or show the same after rounding.

What is the match price?

The price at which the pricier option would cost the same per unit as the other, everything else unchanged.

Last reviewed 2026-10-09. Report an incorrect result

Which Purchase Is the Better Deal?

What it does

How to use it

Detailed answer

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Assumptions

How it works

Assumptions

Example

Questions

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