Tipping math is simple in principle, but groups often disagree about what to include. A little structure keeps the end of the meal friendly.
The basic calculation
Multiply the bill by the tip percentage, add it to the bill, and divide by the number of people. For an $86 bill with an 18% tip, the tip is $15.48 and the total is $101.48. Split four ways, that is $25.37 each.
Quick mental shortcuts
To find 10%, move the decimal one place left. For 20%, double that. For 15%, take 10% and add half of it. On $86, 10% is $8.60, so 20% is $17.20 and 15% is $12.90.
Before tax or after tax?
Many people calculate the tip on the pre-tax subtotal, while others use the final total for simplicity. Neither is universally correct. Decide with your group before calculating, and enter the matching amount.
Customs vary by place
Expectations differ widely between countries and even between types of service. In some places a service charge is already included and extra tipping is optional. Check your receipt for an included gratuity, particularly for larger groups, so you do not tip twice.
Splitting when orders are unequal
An even split is fair when everyone ordered similar amounts. If not, calculate each person's share of the subtotal, then add the same percentage for tip and a proportional share of tax. Shared items such as appetizers can be divided evenly first.
Rounding
Divisions rarely come out to whole cents. One person can cover the extra penny, or the group can round each share up to a convenient figure and treat the difference as extra tip.
Sample tip amounts
On a $50 bill, tips of 15%, 18% and 20% are $7.50, $9.00 and $10.00. On $80 they are $12.00, $14.40 and $16.00. On $120 they are $18.00, $21.60 and $24.00. Having a few reference points makes it easy to sanity-check the number your phone shows.
A worked example with unequal orders
Ana ordered $30 of food and Ben ordered $20, so the subtotal is $50. Tax at 8% is $4.00 and an 18% tip on the subtotal is $9.00, making the total $63.00. Ana paid for 60% of the subtotal, so her share is $30 + $2.40 tax + $5.40 tip = $37.80. Ben's share is $20 + $1.60 + $3.60 = $25.20. Together that equals the $63.00 bill exactly.
Discounts, coupons and delivery
If a coupon reduces the bill, many people calculate the tip on the original price because the service was provided for the full meal. For delivery and other services, practices vary by place and platform, so check what is customary where you are and whether a fee already includes a gratuity.
Frequently asked questions
Should I tip on tax? It is a personal and regional choice. Tipping on the pre-tax subtotal is common and simpler to explain.
What if the service was poor? Consider speaking with a manager rather than only reducing the tip, since problems are sometimes outside the server's control.
How do I avoid awkward math at the table? Agree on the method before the bill arrives and use a calculator that shows each person's total.
Try the calculators
Tip Calculator · Bill Splitter
This guide is for general information only. It is not financial, medical, or legal advice.