What is the Label Size Calculator?
Labels should be big enough to read but fit the box face with a margin. The label size calculator finds the largest label for a box face with your chosen margin, then works out how many labels of a size fit on an A4 or Letter sheet with gaps and printer margins.
Create the label itself with the Shipping Label Generator; for roll labels use the Label Roll Calculator.
How to use the Label Size Calculator
- Enter the box face size and the margin.
- Read the largest label size.
- Enter a label size, gap and sheet margins.
- Read labels per sheet and the layout.
Formula
Labels per row = floor((sheet width − margins + gap) ÷ (label width + gap))
Example
On A4 (210 × 297 mm) with 10 mm margins and 3 mm gaps, 99.1 × 38.1 mm labels fit 2 × 7 = 14 per sheet.
Common label sizes
| Use | Size |
|---|---|
| Shipping label | 100 × 150 mm (4 × 6 in) |
| Address label | 99.1 × 38.1 mm |
| Product sticker | 50 × 30 mm |
| Barcode label | 38 × 25 mm |
Related packaging and shipping tools
Packaging decisions are connected: the box size sets the volumetric weight, which sets the courier bill, and the carton size decides how many fit on a pallet or in a container. These related calculators help with the next step:
- Label roll calculator: labels per roll.
- Shipping label generator: printable 4 × 6 label.
- Barcode generator: Code 128, EAN-13 and UPC.
- QR code generator: links, WhatsApp and Wi-Fi.
- Packaging cost calculator: cost per box and product.
Frequently asked questions
How many labels fit on an A4 sheet?
Enter the label size; the calculator shows the count.
What is the standard shipping label size?
4 × 6 inches (100 × 150 mm).
Should labels have a margin?
Yes, leave a few millimetres so edges do not peel.
Does it work for Letter paper?
Yes, choose Letter.
Can it rotate labels?
Yes, it checks both orientations.
Is the Label Size Calculator free to use?
Yes. The Label Size Calculator on Custom Converter is completely free, with no sign-up, no daily limit and no watermark.
Does the Label Size Calculator work on mobile phones?
Yes. It is built mobile-first and works on Android phones, iPhones, tablets and computers in any modern browser, with no app to install.