Question: how much power to charge macbook pro?
Answer: Here's an example—a 15-inch MacBook Pro will charge fastest with an 87-watt charger (which it's typically sold with), although it will charge well enough with a 61-watt one. On the other hand, a 13-inch MacBook Pro will charge at the same speed with either the 61-watt charger it comes with or an 87-watt one.