How to See a Phone's Real-Life Size on Phone Sized

Updated

Phone Sized can show devices at true physical scale, but only after you calibrate the page with a real-world object. The site provides a credit card image for this purpose: you enlarge that image on your screen until it matches the size of an actual credit card you hold against it, and the site then rescales every device image so they appear at real-life size. This works on any screen, but the calibration is per-screen and per-zoom-level, so you need to redo it if you change browser zoom, rotate your device, or move to a different monitor.

Why calibration is needed

A browser has no way of knowing how large your screen's pixels physically are. The same 400-pixel-wide image is a different physical size on a phone, a laptop, and a 27-inch monitor. Phone Sized solves this by letting you anchor the scale to an object with a fixed, known size — a standard credit card (85.60 mm × 53.98 mm, or 3.370 in × 2.125 in). Once the on-screen card matches your physical card, the pixel-to-millimeter ratio is known, and every other image can be scaled correctly.

Step-by-step

  1. Open the comparison page on phonesized.com and add the devices you want to view.
  2. Find the credit card image option and place it on the comparison area.
  3. Hold a real credit card flat against your screen, lining up one edge with the on-screen card.
  4. Enlarge or shrink the on-screen card image until its edges match your physical card exactly. Use the browser zoom or the site's resize control, whichever the page exposes.
  5. Once matched, leave the zoom level untouched. The device images are now displayed at real-life size.
  6. Compare the phones or tablets on screen against each other, or hold your own device next to the screen to see the difference directly.

Expected result: the device outlines on screen correspond to the actual physical dimensions of those devices, so a phone that is 6 mm taller than another will look 6 mm taller on your screen.

What you can do once calibrated

  • Side-by-side mode — view two devices next to each other and observe the size difference directly.
  • Stacked mode — see one device layered on top of another, which makes width and height differences easier to judge.
  • Outline-only view — show just the device outlines, which is especially useful in stacked mode where solid images would hide the device underneath.
  • Dimension readout — the site reports the difference in mm, inches, and percentage. The select buttons for this sit below each device, and you can compare two devices at a time.

Common snags

  • Calibration drifts after zooming. Any change to browser zoom invalidates the match. Recalibrate before trusting the sizes.
  • Only two devices at once. The dimension-difference feature is limited to a two-device comparison, so for a three-way decision you need to run it in pairs.
  • Screen size limits usefulness. On a small phone screen, two large tablets won't fit at true scale at the same time. Use a desktop monitor for tablet comparisons.
  • Credit card must be a real one. A printed or on-screen reference won't work, since the whole point is matching against a physical object with known dimensions.

When this is worth doing

Calibration is worth the extra step when the exact physical feel matters — for example, deciding whether a 6.8-inch phone will actually fit your hand or pocket compared with your current 6.1-inch model, or checking whether a tablet will fit a bag sleeve. If you only need a rough sense of which device is bigger, the uncalibrated side-by-side view is faster and good enough.

Phone Sized also maintains a broad device database covering Apple, Samsung, Huawei, Xiaomi, Oppo, OnePlus, Sony, Nokia, ZTE, and others, and adds newly announced devices regularly. If a device you want is missing, the site's author asks that you contact him on Twitter to request an addition.