Free Tip Calculator
Calculate tips and split bills easily, in seconds.
How do you calculate a 20% tip?
A 20% tip is calculated by multiplying the pre-tax bill amount by 0.20. For a $100.00 bill, the tip is $20.00, making the total $120.00 before any sales tax. If splitting among 4 people, each person pays $30.00.
Standard Tip & Bill Split Formulas
- Tax Amount = Bill Subtotal × (Tax Rate ÷ 100)
- Tip (Before Tax) = Bill Subtotal × (Tip Rate ÷ 100)
- Tip (After Tax) = (Bill Subtotal + Tax Amount) × (Tip Rate ÷ 100)
- Total Amount = Bill Subtotal + Tax Amount + Tip Amount
- Per Person Total = Total Amount ÷ Number of People
How Much Should You Tip?
In the United States, 15% to 20% of the pre-tax bill is the standard benchmark for sit-down restaurant service. Use 15% for satisfactory service, 18%–20% for good service, and 25% or more when a server goes above and beyond or handles a large group smoothly.
Mental Math Shortcut for Fast Tipping
To estimate 20% in your head without a calculator, move the decimal point one place left to find 10%, then double it. For a $64.00 bill, 10% is $6.40, so 20% is $12.80. Add half of 10% ($3.20) to $6.40 to get 15% ($9.60).
Accuracy & Privacy Built In
All calculations run directly in your browser using integer-cent arithmetic—preventing floating-point rounding bugs and automatically balancing leftover cents when splitting a check unevenly (such as dividing $100.00 across 3 people into $33.34, $33.33, and $33.33). We never upload your bill amounts.
FAQ
Should I calculate tip before or after tax?
Traditional tipping etiquette recommends calculating the tip on the pre-tax subtotal. Sales tax goes to local and state governments rather than restaurant service staff. However, many point-of-sale tablets default to post-tax percentages—either choice works, and you can toggle between Before Tax and After Tax above.
How does the calculator handle uneven bill splits like $100 divided by 3?
Our engine operates in exact integer cents and distributes any remainder cent across participants so the sum always equals the exact total. For $100.00 split 3 ways, one person pays $33.34 and two people pay $33.33, totaling $100.00.
Does this tip calculator save or transmit my bill amounts?
No. All math runs locally in your browser. Calculation history is disabled by default and only saved to your own device localStorage if you explicitly toggle history on.
What is a standard tip percentage for restaurants in the US?
For sit-down dining in the US, 18% to 20% is standard for good service, 15% for average service, and 22%–25% for standout service or holidays. For counter service or takeout, 10% or rounding up is optional.
Can I switch currencies without changing my tip percentage?
Yes. Switching between USD, CAD, AUD, GBP, EUR, JPY, and CNY preserves your chosen tip rate and adjusts decimal formatting automatically (such as 0 decimals for Japanese Yen).
Updated November 2026. Visit Tip Calculator on tipcalc.cc.