Splitting a bill fairly — whether equally or by what each person ordered — is a daily calculation. Here is every method explained clearly.
Method 1: Equal Split
The simplest approach. Everyone pays the same amount regardless of what they ordered.
Per Person = (Subtotal + Tax + Tip) ÷ Number of People
Example: Dinner for 4, subtotal $120, tax $10.20 (8.5%), tip 20%:
- Tip = $120 × 0.20 = $24
- Total = $120 + $10.20 + $24 = $154.20
- Per person = $154.20 ÷ 4 = $38.55 each
Method 2: Pay What You Ordered
Each person pays for their own items plus their share of shared costs.
Steps:
- Calculate the total before tax and tip
- Each person's share of the pre-tax subtotal = their items' cost ÷ subtotal
- Apply that percentage to the total (including tax and tip)
Share % = Your Items ÷ Subtotal
Your Total = Share % × (Subtotal + Tax + Tip)
Example: Four people, subtotal $120:
- Alice ordered $35 → 35/120 = 29.2% → owes $154.20 × 0.292 = $45.00
- Bob ordered $28 → 28/120 = 23.3% → owes $154.20 × 0.233 = $35.93
- Carol ordered $32 → 32/120 = 26.7% → owes $154.20 × 0.267 = $41.17
- Dave ordered $25 → 25/120 = 20.8% → owes $154.20 × 0.208 = $32.07
- Total: $154.17 (≈$154.20, rounding difference)
Method 3: Tip on Your Share Only
Some people prefer to tip only on their own subtotal. This is mathematically identical to Method 2 — applying your percentage to the full total includes your proportional share of the tip.
Calculating Tip Quickly
Mental tip calculation:
- 10%: Move decimal left one place ($120 → $12)
- 15%: 10% + half of 10% ($12 + $6 = $18)
- 20%: Double the 10% ($12 × 2 = $24)
- 18%: 10% + 8% ≈ 10% + (10% - 20% of 10%) = $12 + $9.60 = $21.60
Tip = Subtotal × Tip Percentage
Total = Subtotal + Tax + Tip
Recommended Tip Percentages (US 2025)
| Service | Tip Percentage |
|---|---|
| Sit-down restaurant (good service) | 18–22% |
| Excellent service | 25%+ |
| Buffet | 10% |
| Food delivery | 15–20% |
| Counter service (coffee shop) | Optional, 10–15% |
| Taxi / rideshare | 15–20% |
| Bartender | $1–2 per drink, or 15–20% |
Note: Tip percentages should generally be calculated on the pre-tax subtotal, not the total including tax. In practice, many people tip on the full total — the difference is minor.
Splitting With Shared Dishes
For shared appetisers, bottles of wine, or desserts:
Option A: Add shared items to the subtotal before dividing. Everyone pays equally for shared items.
Option B: Split shared items equally, then add each person's own items:
Shared Cost per Person = Shared Items Total ÷ Number of People
Individual Total = Your Items + Shared Cost per Person
Example: $30 shared appetiser between 4 people:
- Each person owes $7.50 for the appetiser plus their own entrée
Handling Alcohol
If some people drank and others didn't, separate alcohol from food:
- Sum all alcohol charges
- Split alcohol equally among drinkers
- Split food charges by preferred method among everyone
- Combine both totals per person
Quick Formula for Any Bill
Your Share = (Your Food + Shared Items ÷ Party Size) × (1 + Tax Rate) × (1 + Tip Rate)
Example: Your food = $28, 1/4 share of $30 appetiser, 8.5% tax, 20% tip:
- Base = $28 + $7.50 = $35.50
- With tax: $35.50 × 1.085 = $38.52
- With tip: $38.52 × 1.20 = $46.22
Use our tip calculator to handle any combination of party size, subtotal, and tip percentage instantly.