Today, 1.00 (one) Euro is worth 4.23 Polish Zloty, ie, €1.00 = z4.23. That's because the current exchange rate, used to convert to Polish Zloty, is 4.23. So, to make Euro to Polish Zloty conversion, you just need to multiply the amount in EUR by 4.23, the currency rate today.
Euro (EUR) to Polish Zloty (PLN) Cheat Sheet Table
You can print out and cut this "currency table" also known as currency 'cheat sheet' for travellers or 'pocket guide' and keep it with you. During your travel you can compare currency amounts in foreign currency with your own home currency and vice-versa, so you will not need any calculator or mobile app get an idea of how much you will pay for a product or service.
Print out this Euro to Polish Zloty Currency Table