Split Bill Calculator with Tax and Tip
Enter what each person ordered, the shared items, the tax and the tip. Tax and tip can follow what each person ordered or be split evenly, and the cents always add up to the bill.
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Formula
- Own items per person
i:items_i. Shared items are split evenly:shared ÷ people. - Pre-tax share:
pre_i = items_i + shared ÷ people. Subtotal:S = sum of pre_i. - Tip:
tip = S × tip% ÷ 100. Extra charges:X = tax + tip. - Proportional split:
pay_i = pre_i + X × pre_i ÷ S. Even split:pay_i = pre_i + X ÷ people. - Cents are rounded with the largest-remainder method so the shares add up to the bill total exactly.
Worked example
Three people order 40, 35 and 25, with 30 of shared dishes (10 each), tax of 8 and an 18% tip.
- Pre-tax shares: 50, 45 and 35, so the subtotal is 130 and the tip is 23.40.
- Extra charges: 8 + 23.40 = 31.40, bill total 161.40.
- Proportional: 62.08, 55.87 and 43.45.
- Even: 60.47, 55.47 and 45.46.
Assumptions
- Tip is a percentage of the pre-tax subtotal.
- Shared items are always split evenly between the people entered; items entered for people beyond the head count are ignored.
- If the subtotal is zero, the tax is split evenly.
Frequently asked questions
How do I split a bill when everyone ordered different things?
Give each person their own items, split shared dishes evenly, then share the tax and tip. With three people ordering 40, 35 and 25 plus 30 of shared dishes, each person's own share before tax and tip is 50, 45 and 35.
Should tax and tip be split evenly or in proportion?
Proportional is fairer when orders differ a lot, because tax and tip are charged on what was ordered. In the example, tax 8 plus an 18% tip of 23.40 is 31.40, so the person with 50 pays 12.08 of it and the person with 35 pays 8.45. An even split is simpler and gives 10.47 each.
Is the tip calculated before or after tax?
This calculator takes the tip as a percentage of the subtotal before tax, a common convention. On a 130 subtotal, 18% is 23.40. If you tip on the total including tax, raise the tip percentage slightly.
Why might my share differ by a cent from a plain calculation?
Shares are rounded to whole cents. The leftover cents are given to the people whose shares had the largest fractions, so the amounts always add up exactly to the bill total of 161.40 in the example.