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How to Calculate a Tip
Tipping is customary in many countries, but figuring out the right amount can be tricky — especially when splitting a bill. Whether you’re dining out, ordering delivery, or getting a haircut, knowing how to calculate a tip quickly is a useful everyday skill.
The Basic Tip Formula
The formula for calculating a tip is straightforward:
Tip = Bill Amount × (Tip Percentage / 100)
And the total you pay:
Total = Bill Amount + Tip
For example, if your restaurant bill is $65 and you want to leave a 20% tip:
bill = 65
tip = bill × 20%
total = bill + tip
The right pane shows tip as 13 and total as 78.
Common Tip Percentages
Here are the most common tipping rates:
- 15% — Standard service
- 18% — Good service
- 20% — Great service
- 25% — Exceptional service
Splitting the Bill
When dining with friends, divide the total (including tip) by the number of people:
Per Person = Total / Number of People
For example, a $120 bill with 18% tip split 4 ways:
bill = 120
tip = bill × 18%
total = bill + tip
people = 4
per person = total / people
The right pane resolves tip to 21.60, total to 141.60, and per person to 35.40.
Quick Mental Math Tricks
- 10% tip: Move the decimal point one place left.
$85 → $8.50 - 20% tip: Calculate 10% and double it.
$85 → $8.50 × 2 = $17.00 - 15% tip: Calculate 10%, then add half of that.
$85 → $8.50 + $4.25 = $12.75
Free Tip Calculator
Use this free tool to instantly calculate your tip amount, total bill, and per-person split.
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Example
For a $50 bill with a 15% tip split between 2 people:
bill = 50
tip = bill × 15%
total = bill + tip
per person = total / 2
The right pane resolves tip to 7.50, total to 57.50, and per person to 28.75.
Frequently Asked Questions
How much should you tip at a restaurant?
In the United States, 15-20% is the standard tip for sit-down restaurant service. For excellent service, 20-25% is appropriate. For counter service or takeout, 10-15% is common but optional. Always tip on the pre-tax bill amount.
Should you tip on tax?
Traditionally, you tip on the pre-tax subtotal, not the total after tax. However, many people tip on the full amount for simplicity. The difference is usually small, and either approach is acceptable.
How do you split a bill with a tip evenly?
Calculate the tip on the full bill first, then add it to the subtotal to get the grand total. Divide the grand total by the number of people. For example, a $120 bill with 18% tip: $120 + $21.60 = $141.60, split 4 ways = $35.40 per person.
Need to calculate a discount before tipping? Try our discount calculator. For more complex everyday calculations, see why a notepad calculator beats a spreadsheet for quick math.
Calculate Tips in Notes Calculator
Notes Calculator understands percentage expressions naturally, so tipping math is effortless:
# Dinner Bill
bill = $120
// Tip options
15% tip = 15% of bill
18% tip = 18% of bill
20% tip = 20% of bill
// Split with 20% tip
total = bill + 20%
people = 4
per person = total / people
The syntax bill + 20% adds a 20% tip directly — no formula needed. You can also type 15% on 120 or 120 + 15% for the same result. Variables like bill and people let you adjust values and see every line update in real time. For the full set of percentage idioms (including % off, reverse percentages, and previous), see how Notes Calculator handles percentages.