How to Calculate Tips and Split a Restaurant Bill

In many U.S. full-service restaurants, guests aim near these bands for standard service:

• 15% — older baseline; still used, often seen as the low end of solid service
• 18% — common modern default for good service
• 20% — widely used target for very good service or simple mental math
• 22–25%+ — excellent service, complex orders, or when you want to be generous

Fast mental shortcuts

For 20%: move the decimal one place left for 10%, then double it. Bill $46 → $4.60 → $9.20 tip. For 15%: take 10% then add half of that ($4.60 + $2.30 = $6.90). For 18%: 20% minus a small cut, or 10% × 1.8.

Worked full example

Food and drink subtotal $82.00. Tip at 18%: 82 × 0.18 = $14.76. Total with tip (pre-tax base) ≈ $96.76 before sales tax is layered on, depending on how you structure the check. Exact post-tax totals depend on your local tax rate and whether you tip on pre-tax or post-tax.

Any “X% of Y” step is the same percent skill — deeper drills live in our percentage calculation guide and the free percentage calculator.

Both habits exist. Many etiquette guides and servers prefer tipping on the pre-tax subtotal (food and drink before sales tax). Some people tip on the post-tax total because it is the big number on the receipt and slightly higher.

Why the base matters

Sales tax is not service. Tipping on pre-tax keeps the gratuity tied to the meal and labor. Tipping on post-tax quietly raises the tip by the tax rate — for example, 8% tax on an 18% tip is roughly an extra 1.4 points of tip relative to the meal (18% × 1.08 ≈ 19.4% of pre-tax).

Numbers side by side

Subtotal $100, tax 8% → tax $8, grand total $108.

• 18% pre-tax: tip $18.00 → pay $126.00 total
• 18% post-tax: tip $19.44 → pay $127.44 total

Neither is “illegal math.” Pick a rule and stay consistent so group splits stay fair. Card terminals often default to percentages of a specific line — read the prompt so you know which base they use.

The free tip calculator supports tax handling so you can model both approaches before you tap a preset button.

Even splits are easiest when everyone ordered roughly the same value. Itemized splits are fairer when orders differ a lot (steak vs salad, heavy drinks vs water).

Even split steps

1. Agree on the tip base (pre-tax or post-tax) and tip percent.
2. Compute tip amount, then total to collect.
3. Divide total by number of people.
4. Round up a few cents per person if you want clean cash amounts and leftover covers tax noise.

Worked even split

Bill subtotal $120, tax $9.60, tip 20% on pre-tax = $24. Party of 4. Total to cover = 120 + 9.60 + 24 = $153.60 → $38.40 each.

Uneven orders

Sum each person’s items (and shared apps split by agreement), assign tax proportionally or by the same percent, then tip on each person’s subtotal or on the table subtotal and allocate tip by share of food. Apps that scan the receipt help; otherwise appoint one person to run the tip calculator with party size for the even case.

Large parties sometimes get an automatic gratuity — see the service-charge section before you double-tip.

Rounding keeps cash simple and often adds a little extra for the server.

• Round tip up — $14.76 tip → $15.00
• Round total up — make the card or cash total a clean dollar
• Exact cents — fine on cards; awkward with cash drawers

Card vs cash

Card tips usually flow through payroll on a delay. Cash tips go to the worker immediately (subject to house tip-out rules). Your percent math is the same either way; only the path of the money changes.

Preset buttons

Terminals often show 18% / 20% / 25%. Confirm whether those percents apply to pre-tax or post-tax. Custom tip lets you type a dollar amount when you already did the math by hand or in a calculator.

If you only need “what is 20% of 67.50?” without party splits, the percentage calculator is enough. For per-person restaurant flows, stay in the tip tool.

Context changes the expected percent more than the formula does.

• Full-service dining — 15–20%+ on the meal is common in the U.S.
• Counter / fast casual — optional tip jars and tablets; many people tip less or skip for pure counter pickup
• Delivery — often a flat amount or percent plus awareness of distance and weather; platform fees are not the driver’s tip
• Coffee / bar — $1–$2 per drink or 15–20% on a tab are common patterns
• Buffets / limited service — lower percent is common when service is minimal; still tip if staff clears and refills actively
• Poor service — some reduce the tip; managers should hear serious problems so staff policy can respond

Automatic gratuity / service charge

Parties of 6–8+ often see 18–20% auto-gratuity printed on the check. That line may already be the tip. Adding another 20% on top can double-pay. Read the receipt: if “service charge” or “auto-gratuity” is present, decide consciously whether to add more.

Travel tip: other countries use service-included pricing or different norms. Do not assume U.S. percentages apply worldwide.

Enter the bill, choose a tip percent, set party size, and decide how tax is handled. Read tip total, grand total, and per-person share.

1. Open the free tip calculator.
2. Enter the bill amount (pre-tax subtotal if that is your rule).
3. Select 15%, 18%, 20%, 25%, or a custom percent.
4. Add tax if you want post-tax tipping or a full pay-at-table total.
5. Set the number of people splitting the check.
6. Optional: enable round-up for cleaner per-person amounts.
7. Pay the per-person amount (or the single-payer total) and confirm auto-gratuity is not already included.

Group etiquette tip

Announce the rule once: “18% on pre-tax, split four ways, round up.” Fewer arguments than silent calculator work under the table.

Most mistakes are base-selection and double-counting problems.

• Tipping on a total that already includes auto-gratuity without noticing
• Splitting uneven orders evenly and leaving one person subsidizing steak-and-cocktails
• Forgetting shared apps and bottles in itemized math
• Confusing platform fees with courier tips on delivery apps
• Using 10% forever in regions where norms moved to 18–20% for full service
• Percent button on the wrong base at the terminal (pre-tax vs post-tax)

Percent skills transfer beyond restaurants — grades, discounts, and health metrics all use the same “part of whole” idea. For academic averages see our GPA calculation guide; for height-weight screening math see the BMI guide.

This guide is educational. House policies, local law, and posted service charges control what appears on your receipt.