I have a lot of card bought from various places and I sometimes would like an indication of the gsm (gram per square metre) of the card to help me with cut settings on my Silhouette Cameo. So I sat down today to work out the formula! If you don't follow the Maths, then just believe me, and I will give you the formula at the end.
1 square metre is 100 x 100 square cm = 10,000 square cm.
A4 card = 29.7 cm x 21 cm = 623.7 square cm
10,000/623.7 = 16.03
So the weight of your A4 card x 16.03 = the gsm
If you have accurate weigh scales, you need to weigh your piece of A4 card. Mine weighed in at 14g.
14g x 16.03 = 224gsm
The weight of your A4 sheet in g, multiplied by 16.03 = your gsm
I also have an A4 sheet of Kraft card weighing 18g
18 x 16.03 = 288 gsm
For 12" x 12" card (30.5 x 30.5cm = 930.25 sq cm)
10,000/930.25 = 10.75
I weighed some card stock that is labelled 200gsm. It weighed 18g on my scales.
18 x 10.75 = 194g which is close enough.
The weight of your 12" x 12" sheet in g, multiplied by 10.75 = your gsm
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ReplyDeleteHi there i just thought i would let you know i have checked this out on some card i have the weight for and it is near enough so i am thanking you and now i can sort out all the card i have - and i have a lot of card not labelled up so now i must get things done properly. Regards Ann :o)
ReplyDeleteThanks Anne. I am glad it helped. I keep looking back at this post myself!
ReplyDeleteGood sharing. Cut accurate fabric circular samples with smooth edges by drawing action even difficult materials such as fabric, thin films, tissue paper, and corrugated cardboard and synthetic leather can be cut by the sample cutter conveniently. GSM scales will help you.
ReplyDeleteThank you so much for sharing. This is just what I needed this morning.
ReplyDeleteGood ole google search found you.
Thanks Air Bear Rep. best wishes, Hilary
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