Price per inch calculator
Bigger screens cost more, but by how much per inch of picture? Price per diagonal inch understates the jump in size, because area grows with the square of the diagonal. This calculator compares up to three options by price per square inch, then checks a sale against the price the product usually sells for.
Results are estimates for planning. Check the manufacturer's manual before you drill, buy or mount anything.
How it works
For a screen with diagonal D and aspect ratio a, the width is D × a / √(a² + 1) and the area is width² / a. For 16:9 that works out to about 0.427 × D²: a 75-inch TV has 33% more picture than a 65-inch one, although its diagonal is only 15% longer.
price per square inch = price / area real discount = 1 − sale price / usual price
The discount check compares the sale with what the product actually sold for recently, not with the reference price printed next to it. US rules on former-price comparisons (16 CFR Part 233) say a “was” price should be one at which the item was really offered in good faith for a reasonable time.
Assumptions and limits
- Price per square inch compares size only. Picture quality, brightness and features differ between models at the same size.
- Use the price history from a tracker you trust for the usual price; a single earlier price can mislead.
Sources
Last reviewed: November 2026.