What Is a Good Tip and How to Calculate a Tip

A standard tip is 15–20% of the pre-tax bill for sit-down restaurant service, with 20% now the widely accepted baseline for good service in the United States.

Tipping norms have shifted meaningfully over the past decade. According to a 2023 Pew Research Center survey, 72% of Americans say tipping is expected in more situations than it was five years ago — and the average tip at full-service restaurants has risen from 18% to closer to 20–22%. Knowing how to calculate a tip quickly, and knowing what percentage is fair for different services, is a practical skill that saves you from guessing at the register.

Use the free Tip Calculator at RoughTools to calculate any tip and split the bill instantly — or follow the step-by-step method below.

The Tip Calculation Formula

Calculating a tip requires two numbers: your bill total and the tip percentage you want to leave. From those, you can find the tip amount, the total you owe, and each person's share if splitting.

Tip formula:

Tip Amount     = Bill Total × (Tip % ÷ 100)
Total with Tip = Bill Total + Tip Amount
Per Person     = Total with Tip ÷ Number of People

Or combined:

Total with Tip = Bill Total × (1 + Tip % ÷ 100)

Where:

Bill Total — the subtotal on your receipt before tax (see the note below about tax)
Tip % — the percentage you want to tip (e.g., 20 for 20%)
Tip Amount — the dollar amount you add on top
Total with Tip — what you actually hand over or charge to the card
Number of People — how many people are splitting the bill equally

Worked example: dinner for three, $67.43 subtotal, 20% tip

Three friends finish dinner. The subtotal — before tax — is $67.43. They want to leave a 20% tip and split the total equally.

Step 1 — Calculate the tip amount:
  Tip = $67.43 × (20 ÷ 100)
  Tip = $67.43 × 0.20
  Tip = $13.49 (rounded to nearest cent)

Step 2 — Find the total with tip:
  Total = $67.43 + $13.49
  Total = $80.92

Step 3 — Divide by number of people:
  Per person = $80.92 ÷ 3
  Per person = $26.97 (rounded up to nearest cent)

The result: each person owes $26.97 — tip included, before tax is added. If the restaurant adds tax separately on the final bill, recalculate the split after tax is applied. Most people in practice round each person's share up to a clean number like $27.00 to avoid fumbling for exact change.

How to Calculate a Tip Step by Step

Find the pre-tax subtotal on your receipt. The subtotal is the line that shows the cost of your food and drinks before sales tax is applied. Tipping on the pre-tax amount is the standard — tipping on the post-tax total is technically more, which is fine if you want to be generous, but it is not the expected baseline.
Decide on your tip percentage. Base this on service quality, not just habit. A general guide: 15% for adequate service, 18–20% for good service, 22–25% for exceptional service, and below 15% if service was genuinely poor (more on this in the mistakes section). For services other than restaurants, see the tipping guide section below.
Convert the percentage to a decimal by dividing by 100. Twenty percent becomes 0.20. Eighteen percent becomes 0.18. This is the multiplier you apply to the bill. If the math feels cumbersome, the shortcut: calculate 10% of the bill (move the decimal one place left), then scale from there.
Multiply the subtotal by the decimal to find the tip amount. For a $52.80 bill at 20%: $52.80 × 0.20 = $10.56 tip. For 18%: $52.80 × 0.18 = $9.50 tip. Round to the nearest dollar or 50 cents for simplicity — your server will not notice a 6-cent difference.
Add the tip to the subtotal for the total amount. This is what you write on the receipt or enter as the total on a card machine. $52.80 + $10.56 = $63.36. If splitting, divide this number by the number of people at the table.
Check that your tip makes sense proportionally. Ten percent of a $52.80 bill is $5.28. Twenty percent is $10.56 — roughly double. If your calculated tip is wildly higher or lower than double the 10% figure, recheck the math. This sanity check takes three seconds and catches most errors.

Pro tip: The double-the-tax trick works in cities with 8–9% sales tax. Double the tax line on your receipt and you get close to an 18–20% tip without any mental math. In New York City (8.875% tax), doubling the tax gives you roughly a 17.75% tip. Not perfect, but close enough for casual dining.

What Is a Good Tip Percentage for Different Services?

A good tip percentage varies by service type, not just by how much you enjoyed the experience. Different industries have different norms — and what is generous in one context is standard in another.

| Service | Standard Tip | Notes | |---|---|---| | Sit-down restaurant | 18–20% | 20% is the current baseline | | Food delivery | 15–20% | Tip on the pre-delivery-fee subtotal | | Takeout | 10–15% (optional) | Not expected, but appreciated | | Bartender | $1–2 per drink or 15–20% | Higher for complex cocktails | | Coffee shop | $1–2 flat or 10–15% | Tip jars are optional, not required | | Hotel housekeeping | $2–5 per night | Leave daily, not just at checkout | | Taxi / rideshare | 15–20% | Use the app's suggested amounts as a floor | | Hair salon | 15–20% of service cost | Tip the stylist, not the receptionist | | Spa / massage | 15–20% | Same as restaurant norms | | Food truck | 10–15% (optional) | Counter service — norms are looser | | Movers | $20–50 per mover | Flat amount, not a percentage |

Tipping norms are genuinely regional. In major metropolitan areas like New York, San Francisco, and Chicago, 20% is the expected floor for restaurant service. In smaller cities and rural areas, 15–18% remains common. International travelers should note that tipping customs differ significantly — in Japan, tipping can be considered rude; in many European countries, rounding up to the nearest euro or 5–10% is the norm.

How Do You Split a Bill With Different Amounts Per Person?

To split a bill where people ordered different amounts, calculate each person's share of the food cost first, then add a proportional tip to each share.

The straightforward approach when people ordered very different amounts:

Person's Food Share = Person's Items ÷ Subtotal × 100 (as a percentage)
Person's Tip Share  = Total Tip × (Person's Food Share ÷ 100)
Person's Total      = Person's Food Items + Person's Tip Share + Person's Tax Share

Worked example: two people. Alex ordered $28.50 in food. Jordan ordered $19.75. Subtotal is $48.25. The agreed tip is 20%, making the tip $9.65.

Alex's percentage of the bill:   $28.50 ÷ $48.25 = 59.1%
Jordan's percentage:              $19.75 ÷ $48.25 = 40.9%

Alex's tip share:   $9.65 × 0.591 = $5.70
Jordan's tip share: $9.65 × 0.409 = $3.95

Alex pays:   $28.50 + $5.70 = $34.20
Jordan pays: $19.75 + $3.95 = $23.70
Total:       $34.20 + $23.70 = $57.90 ✓ (subtotal + tip)

In practice, most groups either split evenly regardless of who ordered what, or use the tip calculator with itemized splitting — which handles the proportional math automatically. An uneven split done in your head under mild social pressure is where most errors happen.

Is It Rude to Tip Less Than 20%?

Tipping less than 20% is not inherently rude — but context matters significantly. At a full-service restaurant in a major U.S. city, 20% is now the social expectation for competent service, not exceptional service. Leaving 15% where 20% is the norm reads as mild disapproval, even if that is not the intent.

That said, tipping below 20% is appropriate in specific situations:

Service was genuinely poor (long waits without acknowledgment, wrong orders repeatedly, dismissive attitude)
You are in a region where 15% remains the local standard
You are a frequent regular and already tip generously on average over time
The service is counter-based or minimal (coffee shops, takeout windows)

What is rude: leaving no tip at all after full table service, or leaving a token amount like $1 on a $60 bill. Servers in the United States are typically paid a subminimum tipped wage — $2.13 per hour federally, though many states set higher minimums — and rely on tips to reach their effective hourly rate. Leaving no tip on a standard restaurant meal directly reduces a worker's income below the minimum wage in many states.

The percentage calculator can help you quickly compare what different tip percentages cost in dollar terms before you decide.

Common Mistakes to Avoid When Calculating a Tip

Tipping on the post-tax total instead of the pre-tax subtotal. In states with high sales tax, this adds meaningfully to your tip. On a $60 subtotal with 10% tax, the bill is $66. Tipping 20% on $66 is $13.20; on $60 it is $12.00. The $1.20 difference adds up across many meals. The standard is to tip on the pre-tax subtotal — unless you specifically want to tip more generously.
Forgetting that tip prompts on card machines are often calculated on the post-tax total. Many restaurant point-of-sale systems present the "15%, 18%, 20%" buttons on the final total including tax. If you press the 20% button, you are tipping 20% on a number that already includes tax. Verify what the dollar amounts shown actually represent before tapping.
Splitting evenly when someone did not drink alcohol. A table where half the guests ordered drinks and half did not creates a real imbalance with an even split. Someone who ordered water and a salad should not subsidize the table's wine. Either itemize, or agree beforehand that everyone covers their own drinks separately.
Assuming the service charge is the tip. Many restaurants, especially for large parties, automatically add an 18–20% service charge or gratuity to the bill. If you then add another 20% tip on top, you are tipping 40%. Check the bill carefully for "gratuity," "service charge," or "auto-gratuity" before adding anything.
Reducing the tip to protest kitchen issues. If your food took too long or arrived incorrect, that is usually a kitchen problem — not a server problem. Withholding a tip punishes the server for something outside their control. A better approach: mention the issue to the server or manager, who can often comp a dish or reduce the bill. The tax calculator can help you verify the bill is correct before you calculate the tip.

Frequently Asked Questions

What is the easiest way to calculate a 20% tip? Move the decimal one place left on your bill to get 10%, then double it for 20%. On a $54.80 bill: 10% = $5.48, doubled = $10.96, rounded to $11.00. This method works reliably for any bill size and requires no calculator. For more complex scenarios — splitting a bill, applying two different tip levels, or calculating on a post-discount price — the tip calculator handles it in seconds.

What if the service was terrible — should I still tip? Yes, but you can tip less. A 10% tip on poor service communicates dissatisfaction more clearly than leaving nothing, which a server might interpret as forgetting. If service was genuinely unacceptable — not just slow due to a busy night, but actively rude or negligent — speak to a manager. A reduced tip paired with clear feedback is more effective than a silent $0. Remember that many service failures originate in the kitchen or with management, not the server.

What is the difference between a tip and a service charge? A tip is a voluntary, customer-determined payment added on top of the bill. A service charge is a mandatory fee set by the restaurant, shown as a line item on the bill — typically 18–22% for large parties. Tips go directly to the server (in most states). Service charges are technically revenue to the restaurant and may or may not be passed to servers in full. The IRS classifies them differently for tax purposes. If you see a service charge and want to tip additional, a small amount (5%) on top is appreciated but not expected.

How much should I tip on a $200 restaurant bill? On a $200 pre-tax restaurant bill, a 20% tip is $40, making the total $240 before tax. An 18% tip is $36. For a table of four, that works out to $10 per person in tip, or $60 per person total. On larger checks, some diners drop to 15–18% on the assumption that the server's absolute dollar amount is still substantial — this is a personal choice, not a rule. The server's effort on a $200 table is usually greater than on a $50 table, which supports keeping the full percentage.

When should I use a tip calculator vs. doing the math in my head? Use the tip calculator whenever you are splitting a bill among more than two people, dealing with a complicated check, or trying to calculate a specific dollar tip to land on a round total. Mental math handles simple cases fast — 20% on a round number, one or two people. The calculator earns its keep when you are dividing $147.63 among five people with different orders and trying not to look like you are doing algebra at the table.

Use the Free Tip Calculator

The Free Tip Calculator at RoughTools calculates any tip amount and splits the bill in seconds. Enter your bill total, choose a tip percentage or enter a custom amount, and specify how many people are splitting — the calculator instantly shows each person's share, the total tip in dollars, and the complete bill total. It also supports rounding up to the nearest dollar for easy cash splitting. No account needed, works on any device, completely free.

Free Tip Calculator →

You might also need:

Discount Calculator — calculate the final price after a coupon or promotional discount before figuring the tip
Tax Calculator — add your local sales tax to the bill to confirm the pre-tip subtotal
Percentage Calculator — find any percentage of a number, or calculate what percentage a tip represents of the total
Salary Calculator — understand take-home pay for tipped workers, including how tip income affects net earnings