Price Per Square Inch Calculator

Divide total price by area to find the price per square inch — enter length and width for rectangular items, or a diameter for round items like pizzas, to compare deals of different sizes on equal footing.

Quick Facts

Formula
Price per sq in = Total price / Area
Rectangle area = Length x Width. Circle area = pi x (Diameter / 2)^2.
Common uses
Comparing pizzas, TVs, mattresses, prints, glass, and countertop slabs
A lower price per square inch means more area for the same money, all else equal.

Your Results

Calculated
Price per square inch
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Total price / area
Total area
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Square inches covered
Price per square foot
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For comparing to per-sq-ft quotes
Area in square feet
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Total area / 144

Ready

Enter a price, shape, and dimensions, then press Calculate.

Understanding Price Per Square Inch

Price per square inch is a unit-price measure that divides the total cost of an item by the amount of surface area it covers. It exists so you can compare products of different sizes fairly: a $20 item that covers 100 square inches is a better deal by area than a $14 item that only covers 50 square inches, even though the second one has the lower sticker price. The formula is simple: Price per square inch = Total price / Area in square inches.

Finding the area

The area depends on the shape of the item:

  • Rectangle or square (photos, glass panels, countertops, fabric, most screens measured by their frame): Area = Length x Width, both measured in inches.
  • Circle (pizzas, round tables, circular mirrors, some cake pans): Area = pi x (Diameter / 2)^2. Diameter is the full distance across the circle; the formula squares the radius (half the diameter) and multiplies by pi (approximately 3.14159).

Once the area is known, dividing the total price by that area gives the price per square inch. Multiplying that figure by 144 (the number of square inches in a square foot) converts it to a price per square foot, which is useful when comparing against quotes given in per-square-foot terms, such as flooring, glass, or countertop estimates.

Getting accurate results

  • Measure in inches, not feet or centimeters — mixing units is the most common source of error. Convert first if your measurement came from a different unit.
  • For a pizza or other round item, measure the diameter (edge to edge through the center), not the radius.
  • Use the total price actually paid, including any size-specific fees, so the comparison reflects what you spend, not just a list price.

Using the result

Price per square inch is a comparison tool, not a verdict on quality. A lower number means more area for the money, but it says nothing about ingredients, materials, durability, or taste. Use it to shortlist options that are efficient by size, then weigh the remaining factors — crust quality, screen resolution, mattress firmness, print material — separately.

Frequently Asked Questions

What is the formula for price per square inch?
Price per square inch = Total price / Area in square inches. For a rectangle or square, Area = Length x Width. For a circle (such as a pizza measured by its diameter), Area = pi x (Diameter / 2)^2. Once you know the area, divide the total price by that area to get a per-square-inch cost that lets you compare items of different sizes on equal footing.
How do I compare two different sizes fairly?
Compute price per square inch for each option using the same formula and units, then compare the two numbers directly - the lower price per square inch gives more area for the money. This is the standard method for comparing pizzas of different diameters, TV or monitor screens, mattresses, framed prints, glass, and countertop slabs, since sticker price alone ignores how much area you actually receive.
Why does a round item use pi x (diameter / 2)^2 instead of length times width?
A circle is not a rectangle, so multiplying two straight-line measurements would overstate its area. The geometric formula for the area of a circle is pi times the radius squared, and the radius is half the diameter. Using length x width on a round item such as a pizza or a circular table would give a larger, incorrect area and therefore an artificially low price per square inch.

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