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True size
What 10 × 15 actually looks like. Calibrate this screen once with a bank card, then every size is drawn at the size it prints — so nothing is a surprise when you open it.
First, match a bank card
Hold any bank card against the screen and drag the right edge until the green box is exactly the size of the card. Every bank card in the world is 85.6 mm wide, so once is enough — this phone will remember.
Calibrate this screen once
A screen cannot know how big it really is. Match a bank card to the box and it can — then every size below is drawn at the size it prints.
Measured on your screen, not in our hands. Paper and screen differ in colour and gloss; size is the thing this gets right.
Every size, in order
| Size | In the hand |
|---|---|
| 10 × 15 cm | about the size of a postcard |
| 13 × 18 cm | a little bigger than a postcard |
| 15 × 21 cm | about A5 — half a sheet of A4 |
| 20 × 30 cm | about a sheet of A4 |
| A4 · 21 × 30 cm | about a sheet of A4 |
| A3 · 30 × 42 cm | about A3 — two A4 sheets side by side |
| 10 × 15 cm | about the size of a postcard |
| 15 × 20 cm | about A5 — half a sheet of A4 |
| 20 × 30 cm | about a sheet of A4 |
| 30 × 46 cm | bigger than A3 — a wall piece, not a hand piece |
| 30 × 60 cm | bigger than A3 — a wall piece, not a hand piece |
| 30 × 90 cm | bigger than A3 — a wall piece, not a hand piece |
| 40 × 60 cm | bigger than A3 — a wall piece, not a hand piece |
| 50 × 80 cm | bigger than A3 — a wall piece, not a hand piece |
| 60 × 90 cm | bigger than A3 — a wall piece, not a hand piece |
| 60 × 120 cm | bigger than A3 — a wall piece, not a hand piece |
| A4 framed | about a sheet of A4 |
| A3 framed | about A3 — two A4 sheets side by side |
| 40 × 60 cm framed | bigger than A3 — a wall piece, not a hand piece |
| A5 calendar | about A5 — half a sheet of A4 |
Put it on your own wall
Stand square to the wall and take one photo, with a door in the frame if you can. The photo never leaves your phone — it is drawn here and nowhere else.
How tall is that door?
Drag the two white handles to the top and bottom of something you know the height of — a door is usually 200 cm. Type its real height, and the wall becomes a ruler.
This is a measurement, not a photograph of your room. Paper colour and daylight are not simulated.
Why a bank card
Browsers assume 96 pixels to the inch, and almost no screen actually does that. The one object whose size is identical everywhere is a payment card: ISO/IEC 7810 ID-1, 85.60 by 53.98 millimetres, the same in Addis as in Berlin. Match it once and the page can convert centimetres to pixels honestly.
What it cannot do
A 60 × 120 canvas will never fit on a phone, so the page says what percentage it is showing instead of shrinking it and pretending. Zooming the page breaks the measurement — set the browser back to 100% and reload. And a screen is not paper: judge the size here, judge the colour on a sample print.
Photo books and mugs
Their exact dimensions are still being confirmed with the shop, so they are not in this tool. We will not draw a true-size rectangle from a number we are not sure of — ask us and we will tell you exactly.