PayPal is one of the most used means of payment in the world, with over 140 million active users.
There are many online tools to calculate the percentage of commission on each transfer PayPal will deduct such PayPal Fee Calculator among others, where you can easily enter the amount you want to receive and automatically calculate the payment amount including commission.
With this tool, you can also know how much really will recieve your account if you send a certain amount.