Shipping label size converter for 4x6, A6, A4 and 100x150mm labels
Convert common shipping-label sizes between millimetres, inches and pixels so your thermal printer, PDF viewer and marketplace label settings match.
Good thermal-printer size for shipping labels.
For Australia Post, MyPost Business, eBay and Shopify labels, aim for 4x6 inches, 100x150mm or A6 output before printing on a thermal printer.
Converted size
Millimetres
101.6 × 152.4mm
Inches
4 × 6in
203 DPI pixels
812 × 1218px
Area
154.8cm²
Recommended print setting
Set paper size to 4x6 inches, scaling to Actual Size / 100%, and orientation to portrait unless your PDF preview is sideways.
Common shipping label sizes
- 4x6 inches: the most common thermal shipping label size in the US and many ecommerce tools.
- 100x150mm: the common Australian metric equivalent used for Australia Post/MyPost and many generic thermal label rolls.
- A6: 105x148mm; often used as the one-label-per-page MyPost Business setting.
- A4: office-printer output. Crop or convert this before sending it to a 4x6 thermal printer.
Best print settings for shipping labels
Use a matching paper size, print at Actual Size or 100%, and avoid Fit to Page when the PDF is already 4x6 or 100x150mm. If your PDF is A4, convert it first rather than shrinking the whole A4 page onto one label.
FAQ
Is 4x6 the same as 100x150mm?
Not exactly. 4x6 inches is 101.6x152.4mm, while 100x150mm is the common metric shipping-label size. Most thermal printers and carriers tolerate either if the printer settings match the label stock.
What size are Australia Post shipping labels?
Most thermal-printer workflows use 100x150mm, A6 or 4x6-style labels. MyPost Business may export A4 by default until you change the label format to A6.
What DPI should I use for thermal labels?
203 DPI is common for shipping-label printers. Some Zebra and industrial printers support 300 DPI. Use the DPI value that matches your printer when preparing image exports.
Why does my shipping label print too small?
The usual cause is printing an A4 or Letter PDF onto a 4x6 thermal label. Crop or convert the PDF first, then print at Actual Size / 100%.
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