Guides

Measure anything from a photo.

How measuring from a photo works, the exact sizes of everyday reference objects, and how to get an accurate result.

• How to measure something from a photo

  Measure the real size of an object in a photo using a reference of known size, like a credit card. Step-by-step guide, the math behind it, and accuracy tips.

• Credit card size

  A standard credit or debit card is 85.60 × 53.98 mm (3.370 × 2.125 in) and 0.76 mm thick (ISO/IEC 7810 ID-1). Sizes in mm, cm, inches and pixels.

• iPhone dimensions

  Height, width and depth of every iPhone from iPhone 12 to iPhone 17 Pro Max and iPhone Air, in millimeters and inches, from Apple's specifications.

• Objects of known size for scale

  Everyday objects with standard sizes to put in a photo for scale: bank cards, iPhones, A4 and Letter paper, banknotes, business cards and coins.

• How to measure a box from a photo

  Get the length, width and height of a shipping box from photos on your iPhone: how to shoot each side, how carriers expect dimensions, and how to round.

• How accurate is measuring from a photo?

  What limits the accuracy of measuring from a photo — distance from the camera, angle, lens distortion and marker placement — and how to get the best result.

• How to find your TV size from a photo

  Find your TV's screen size from a photo: tape a card or paper to the screen, measure the diagonal, and match it to a 16:9 size chart from 32 to 98 inches.