Canada to Canada Paypal Fee, is more than 2.9% + CAD$0.30?

[INSPIRED_LIFE]

My product is priced at CAD$600, I have calculated with 2.9% and CAD$0.30, the total is CAD$617.70.
I charged my client via PAYPAL CAD$618, as I thought that would be sufficient to cover PAYPAL fee.
PAYPAL took CAD$18.22 and leave me with CAD$599.78
There is NO details as to how PAYPAL charges, need help...

[Whac-A-Mole]

Paypal fee schedule on its site

[Whac-A-Mole · Accepted solution]

2,9 % of 618 plus 30 cents come to 18.222

[INSPIRED_LIFE]

OMG, you are right! Thanks  
Oh my math... what's a good way to calculate to make sure we cover the paypal fee.
Do you have the formula?

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wrote:

2,9 % of 618 plus 30 cents come to 18.222

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[Whac-A-Mole]

the fee schedule is published on its website.

if your Canadian buyer uses a card issued by a non CANadian bank,you would be paying 4.4%,not 2.9% for cross border transaction,there is no way you know unless you ask the buyer in advance