小费计算器 — 计算小费与分账
本小费计算器即时计算任意餐费的小费金额和总账单。输入账单金额，选择小费百分比，指定分账人数。支持 10% 至 30% 的自定义小费率，即时获得人均总费用。
Frequently Asked Questions
小费计算器是如何工作的？
小费金额 = 账单金额 × 小费比例；总计 = 账单金额 + 小费金额；多人均摊 = 总计 / 人数。例如，$100 账单，20% 小费，4 人均摊：小费 = $20；总计 = $120；每人 = $30。
餐厅给多少小费合适？
美国餐厅小费参考：一般服务 15%；良好服务 18-20%；优秀服务 20-25%；外卖/自取 10-15%（可选）；酒吧 $1-2/杯或 15-20%；送餐员 15-20%（建议至少 $3）。其他国家文化不同，部分地方小费不是惯例。
如果服务很差，是否还应该留小费？
在美国，即使服务不好，通常仍建议给 10-15% 的小费，因为服务员薪资普遍较低（联邦最低时薪仅 $2.13，依赖小费生活）。如果服务确实存在重大问题，可以与经理沟通或在评价平台反映，而不是完全不给小费。
应该按税前还是税后金额计算小费？
惯例是按税前账单金额计算小费（即菜品和饮料的价格，不含销售税）。但大多数人为了方便，直接按含税总价计算，实际差异并不大（小费仅多出消费税率乘以小费率，通常不超过 $1-2）。
Tip Calculation Formula
Calculating a tip is straightforward once you know the formula. Whether you are dining out, ordering delivery, or paying for a service, these two formulas cover every scenario:
Tip Amount
Tip = Bill × (Tip% / 100)
Example: $80 bill at 20% → $80 × 0.20 = $16.00 tip
Per Person (Bill Split)
Per Person = (Bill + Tip) / Number of People
Example: $80 bill + $16 tip split 4 ways → $96 / 4 = $24.00 per person
How to Calculate a Tip in Your Head
You do not always have a calculator handy. These mental math shortcuts make it easy to estimate a tip on any bill:
10% Tip
Move the decimal point one place to the left. A $65.00 bill → $6.50 tip.
15% Tip
Calculate 10%, then add half of that amount. $65.00 → $6.50 + $3.25 = $9.75 tip.
20% Tip
Calculate 10%, then double it. $65.00 → $6.50 × 2 = $13.00 tip. This is the most popular shortcut.
25% Tip
Calculate 10%, double it for 20%, then add the original 10% once more. $65.00 → $6.50 + $13.00 = $19.50 tip. Or simply divide the bill by 4.
Tipping Guide by Service Type
Tipping customs vary by service. Use this table as a quick reference for standard gratuity amounts in the United States:
| Service Type | Recommended Tip | Notes |
|---|---|---|
| Restaurant (sit-down) | 18–20% | 20–25% for excellent service |
| Delivery | 15–20% | Minimum $3–$5 |
| Bartender | $1–$2 per drink or 15–20% | Tip per drink for simple orders, % for tabs |
| Hair salon / barber | 15–20% | Tip on full service price |
| Hotel housekeeping | $2–$5 per night | Leave daily, not just at checkout |
| Taxi / rideshare | 15–20% | More for help with luggage |
| Movers | $20–$50 per mover | More for long-distance or complex moves |
| Valet | $2–$5 | Tip when your car is returned |
Tip Chart by Bill Amount
Use this quick-reference chart to see tip amounts at common bill totals and percentages:
| Bill Amount | 15% Tip | 18% Tip | 20% Tip | 25% Tip |
|---|---|---|---|---|
| $20 | $3.00 | $3.60 | $4.00 | $5.00 |
| $30 | $4.50 | $5.40 | $6.00 | $7.50 |
| $50 | $7.50 | $9.00 | $10.00 | $12.50 |
| $75 | $11.25 | $13.50 | $15.00 | $18.75 |
| $100 | $15.00 | $18.00 | $20.00 | $25.00 |
| $150 | $22.50 | $27.00 | $30.00 | $37.50 |
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