账单金额、小费比例、分摊人数，轻松算出应付金额
小费金额通常是账单金额乘以一个比例。公式为：小费 = 账单金额 × 小费比例。若多人分摊，每人应付 = (账单 + 小费) ÷ 人数。
示例：账单 $120.50，小费 15%，3 人分摊。小费 = 120.50 × 0.15 = $18.08。合计 = $138.58，每人应付 $46.19。
通常建议按账单的税前金额计算小费，但多数人习惯直接按总账单（含税）的百分比计算。两者皆可，视个人习惯而定。
除非服务特别出色，否则 20% 已是公认的高标准。一些特定场合（如节日、大型团体）可以适当调高。
日本、韩国和中国大陆的大部分餐厅没有小费习惯。在这些地方强行给可能被视为不礼貌，请提前了解当地风俗。
Calculate tip, total bill, and split evenly
Tip = Bill Amount × Tip Percentage. If splitting, per person = (Bill + Tip) ÷ Number of People.
Example: Bill $120.50, 15% tip, 3 people. Tip = $18.08, Total = $138.58, Each pays $46.19.
Pre‑tax is the standard recommendation, though many people tip on the final total. Both are acceptable.
Yes, 20% is the typical upper limit for very good service. 30% might be given for exceptional service or during holidays.
Japan, South Korea, and most of mainland China. Always check local norms before traveling.