"每人均摊费" can be translated into English as "equal share of the cost" or "per capita share of the expense".
"Equal share of the cost" emphasizes that each person contributes an equal amount towards the total cost.
"Per capita share of the expense" is a more formal expression, with "per capita" meaning "per person," and it clearly conveys the idea of dividing the expense equally among individuals.
Both phrases are commonly used in contexts where costs need to be divided fairly among a group of people.