How do you calculate a 20% tip?

To calculate a 20% tip: move the decimal one place left (10%), then double it. Example: $45 bill → $4.50 (10%) × 2 = $9.00 tip. Total: $54.00.

What is the standard tip percentage at a restaurant?

In the US, 15–20% is standard for sit-down restaurant service. 15% is the minimum for acceptable service, 18% is common, and 20%+ is for good to excellent service. For exceptional service, 25% is appreciated.

Should I tip on the pre-tax or post-tax amount?

Traditionally, tips are calculated on the pre-tax amount. However, tipping on the total (including tax) is increasingly common because the math is simpler. The difference on a typical meal is only a dollar or two.

How do you split a bill with tip evenly?

Add the tip to the total first, then divide by the number of people. Example: $80 bill with 20% tip = $80 + $16 = $96 total. Split 4 ways = $24 per person. Use PickConverter's free Tip Calculator at pickconverter.com/tip-calculator to do this instantly.

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Calculators · 5 min read

How to Calculate a Tip: The Complete Guide

Whether you're at a restaurant, ordering delivery, or tipping a hairdresser — knowing how to calculate a tip quickly is a life skill. This guide covers standard percentages, the fastest mental math methods, how to split the bill, and when to tip more or less.

Standard Tip Percentages by Service Type

Tipping norms vary by situation. Here's a quick reference for the US:

Service	Standard Range	Excellent Service
Sit-down restaurant	15–20%	25%+
Food delivery	15–20%	20–25%
Coffee / counter service	10–15% (optional)	15–20%
Bar / bartender	$1–2 per drink or 15–20%	20%+
Hotel housekeeping	$2–5 per night	$5–10/night
Taxi / rideshare (Uber, Lyft)	15–20%	20%+
Hair salon / barber	15–20%	25%
Spa / massage	15–20%	20–25%
Food takeout / pickup	10% (optional)	15%

How to Calculate a Tip — 3 Easy Methods

Method 1: The Double-the-Tax Trick

In most US states, sales tax is around 8–10%. Double the tax line on your bill to get approximately a 16–20% tip. No math needed — just look at the tax and multiply by 2.

Method 2: Move the Decimal (10% Base)

The easiest mental math method:

Move the decimal one place left → that's exactly 10%
For 15%: add half of the 10% amount to itself
For 20%: just double the 10% amount

Example: $47 bill
10% = $4.70
15% = $4.70 + $2.35 = $7.05
20% = $4.70 × 2 = $9.40

Method 3: Use a Tip Calculator

The fastest and most accurate method — especially when splitting the bill with a group. PickConverter's free Tip Calculator handles any percentage and any split in seconds.

How to Split the Bill with Tip

The cleanest way to split evenly: calculate the total with tip first, then divide.

Example: $80 bill, 20% tip, split 4 ways
Tip amount: $80 × 0.20 = $16
Total: $80 + $16 = $96
Per person: $96 ÷ 4 = $24 each

Alternatively, each person tips 20% of their own subtotal and adds it to their share — but this gets complicated with shared dishes. The per-person split of the total is simpler.

Should You Tip on Pre-Tax or Post-Tax?

Traditionally, tips are calculated on the pre-tax subtotal. However, tipping on the total with tax is increasingly common — and makes the math one step simpler.

The practical difference is small: on a $50 pre-tax meal with 8% tax ($4), tipping 20% on pre-tax gives $10 vs $10.80 on post-tax. Most servers and guides consider either approach perfectly acceptable.

Tip: The tablet or receipt at many restaurants already calculates suggested tip amounts on the post-tax total, so tipping on that is fine.

Frequently Asked Questions

Move the decimal one place left (that's 10%), then double it. Example: $45 bill → 10% = $4.50 → 20% = $9.00. Total: $54.00.

15–20% is standard in the US for sit-down restaurant service. 15% is the minimum for acceptable service; 20% is common for good service; 25%+ for excellent or special service.

Either is acceptable. Pre-tax is traditional; post-tax is simpler. The difference on a typical meal is only $1–2. Most servers don't mind which you use.

Add the tip to the total first, then divide by the number of people. Example: $80 + $16 tip = $96 ÷ 4 people = $24 each. Or use the tip calculator for instant results.

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