Sending Watercolour Postcards : Does Size Matter?

The general answer is yes but the specific answer is not really!

Postcards and Christmas cards have fairly well established dimensions. For most postcards it is 4 by 6 inches, or roughly 10 by 15 centimetres. However, postcards are not exclusively this size but generally close and our Australian post office machinery for sorting mail handles this size easily. Assuming you card is stiff enough, 200gsm plus, you just need to put a stamp on the back with the address, don’t forget the postcode, and post.

Christmas cards typically have a variety of sizes, but 5 by 7 inch, or roughly12.5 by 17.5 cms, is a popular size. These cards are designed to be sent in a suitably sized envelope, which are usually supplied with the cards. Such larger envelopes by themselves can be hard to find and it might be best to find the envelopes first before embarking on larger cards.

Australia post have size and weight limits and standard post is now $1.50 for up to 13 by 24 cms and up to 5mm thick. 200 gsm paper is around 2mm thick and 300 gsm paper a fraction over 3mm thick but thickness varies by manufacturer and composition.

Australia post still offer cheaper rate 65c for card only posting around Christmas. I believe they now only sell the stamps in pack of 10 (ie $6.50) and I believe you still need to leave the envelope unseal and write card only on the back. Interestingly, Australian Post allow larger sizes for “season cards”, up to 26 by 34cm and up to 20mm thick, in November and December. So this might be an option if you make you own cards and send out several.

Here is a table of common sized option

Watercolour postcard	Either commercial watercolour or homemade postcards	10 by 15cm ~(9 by 17cm)	☑
A6 postcard		10.5 by 14.8cm	☑
Half A5 postcard	cut in half	14.8 by 21cm/2 =>10.5 by 14.6cm	☑
Quarter A4	cut into four	21 by 29.7cm/4 =>10.5 by 14.6cm	☑
A4 Card	Folded into quarters in envelope	~11 by 15cm	☑
A5 Card	Sent as is in envelope	14.8 by 21cm	⮽?☑ Only in Nov./Dec.