Tipping norms vary enough by country, service type, and situation that even people who tip regularly sometimes hesitate at the register. Here is an actual breakdown of standard tipping percentages by situation, plus the math for splitting a bill fairly among a group.
Standard tipping percentages by service (United States)
- Restaurants (sit-down): 15–20% of the pre-tax bill is standard; 20%+ for excellent service.
- Restaurants (counter service): Optional, typically 0–10% if tipping at all.
- Bartenders: $1–2 per drink, or 15–20% of the total tab.
- Delivery drivers: 15–20% of the order total, with a $5 minimum for smaller orders.
- Hair stylists / barbers: 15–20% of the service cost.
- Taxi / rideshare drivers: 15–20% of the fare.
- Hotel housekeeping: $2–5 per night, left daily rather than only at checkout.
These norms are specific to the United States — tipping culture varies significantly elsewhere, with some countries considering it unnecessary or even mildly awkward, and others building a service charge directly into the bill.
The tip calculation itself
Tip amount = bill total × tip percentage
For a $64 bill at 18%: 64 × 0.18 = $11.52 tip, for a total of $75.52.
Splitting a bill among a group
Once you have the total including tip, dividing it evenly is straightforward:
Per-person amount = (bill + tip) / number of people
For that same $75.52 total split four ways: 75.52 / 4 = $18.88 per person.
Tip on the pre-tax or post-tax total?
Standard etiquette calculates the tip on the pre-tax bill amount, not the total after sales tax is added — tax is not a service the staff provided, so basing the tip on the smaller pre-tax number is generally considered correct, even though many people round based on the final total out of convenience.
Rounding for convenience
Many people round the tip up to a clean number rather than tipping an exact percentage — turning an 18% tip that works out to $11.52 into an even $12, for example. This is common practice and not considered under-tipping as long as the rounding goes up, not down.
Tip: for a large group, splitting the bill unevenly based on what each person actually ordered is more precise than an even split, though it requires more upfront calculation — worth it for a big gap in what different people ordered, not necessary for a roughly similar group order.
Skip the mental math
Calculating a tip and splitting it across a group is simple arithmetic, but doing it in your head at a table, especially for an odd percentage or an uneven group size, is where mistakes creep in. CalcMastermind's Tip Calculator handles both the tip amount and the per-person split instantly.
The bottom line
Tipping percentages vary by service type, but the underlying math is always the same two steps — calculate the tip, then divide the total if splitting. Knowing the standard percentages for common situations removes the guesswork of "is this enough."