Our Methodology & Sources

Last updated August 5, 2026 · Reviewed by SnapTipCalc Editorial

SnapTipCalc publishes four different kinds of statement, and they do not carry the same weight. Arithmetic is certain. Statutory wage and tax data is verifiable. Social tipping norms are survey-based and contested. Everything else is our judgement. This page explains how we tell them apart, label them on the page, and keep them current.

The four evidence labels

Source hierarchy

When sources conflict, we prefer them in this order, and we say on the page which one we followed:

1. Primary statute or regulator — US DOL, state and provincial labour ministries, revenue agencies, EU consumer law.
2. Official statistics — Bureau of Labor Statistics, Statistics Canada, national tourism boards.
3. Named, dated consumer research — Pew Research Center, Bankrate, AHLA guidance, with the sample year shown.
4. SnapTipCalc's view — used only where the first three are silent, and always labelled as such.

We do not cite other tipping blogs, aggregator listicles, or AI-generated summaries as sources for a figure.

How we describe percentage ranges

A range such as 15–20% for US sit-down restaurants is a description of reported behaviour, not a rule. It rests on three things:

1. Wage structure. The federal tipped cash wage is $2.13/hour where an employer claims the tip credit; the employer must top up to at least $7.25/hour if tips fall short (US DOL). Many states set a higher floor, so the picture varies by state.
2. Consumer survey data. Pew Research (2023) and Bankrate (2024) report most Americans who tip at sit-down restaurants landing in the 15–20% band.
3. Regional variation. Fine dining and large coastal cities run higher; counter service and takeout are genuinely discretionary. Where we state a figure with no survey behind it, it is labelled as our view.

How the calculators compute

Every calculator on the site runs through one engine, so two pages can never disagree about the same bill:

• Money is held in integer cents internally. Floating-point drift cannot reach the screen.
• Tip is computed on the pre-tax subtotal by default. Post-tax is available and clearly marked, because tipping on tax is a choice, not a standard.
• Split shares use the largest-remainder method: the displayed shares always add back to the displayed total exactly. $10 across three people is $3.34 / $3.33 / $3.33, which sums back to $10.00 exactly.
• Rounding is explicit — round the tip, round the total, or round each person's share up — and never applied silently.
• Tax rates and wage figures come from the sourced datasets described above, not from hard-coded numbers inside individual pages.

How we set country-by-country guidance

International guidance combines national law (whether service is included by statute, as in France), tourism-board guidance, and traveller research. Every country page shows its sources and the date we last checked them. Where locals and visitors behave differently, we say so rather than averaging the two.

Update cadence

• Wage, tax and statutory data: re-checked at least every six months and immediately when a rate change is announced.
• Survey-based norms: refreshed when a new Pew or Bankrate wave is published.
• Country guidance: reviewed annually and on any change to service-charge law.

What this site does not claim

We do not claim there is a single correct tip, that any percentage is owed, or that our figures apply to every venue in a country. Tipping is a social practice that varies by city, venue and year. The arithmetic is exact; the norms are guidance.

Corrections

Found something wrong? Email snaptipcalc@gmail.com with the page URL and the source you'd like us to consider. We fix errors within a few business days and note the change in the "Last updated" date.

Want to see this in action? Start with our main tipping guide or the FAQ.