General · February 6, 2026 · 4 min read
How to Split a Bill and Calculate Tips Like a Pro
Splitting a group bill and calculating an appropriate tip seems simple until you're actually at the table doing mental math under social pressure. Here's a clear approach that removes the guesswork.
What's a standard tip in the US?
For sit-down restaurant service, 15-20% is common, with 20% often considered standard for good service. Some people tip on the pre-tax subtotal rather than the total bill, which is a slightly more conservative approach since sales tax doesn't reflect the service received.
The straightforward way to split evenly
Add the tip to the bill total first, then divide the combined total by the number of people. This ensures the tip itself is also split evenly, rather than calculated separately per person, which can introduce small rounding inconsistencies.
When an even split isn't fair
If people ordered significantly different amounts, an even split can feel unfair to those who ordered less. In these cases, calculate each person's individual subtotal, apply the same tip percentage to each portion separately, then have each person cover their own adjusted total.
A quick mental math trick for tipping
To estimate a 20% tip quickly: find 10% of the bill (move the decimal point one place left), then double that number. For an 18% tip, find 10%, then add half of that same 10% amount (which represents 5%), then subtract a small amount for the remaining difference — or more simply, use 20% and round down slightly.
A worked example
A $100 bill split among 4 people, with a 20% tip: the tip is $20, bringing the total to $120. Divided evenly among 4 people, each person owes $30 — $25 for their share of the bill plus $5 for their share of the tip.
Frequently Asked Questions
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Published February 6, 2026. This article is for general informational purposes only — read our disclaimer.