Partage d'addition, gratuit

Comment ça marche

Saisissez le sous-total de l'addition, la TVA et le pourboire (en montant ou en pourcentage). Ajoutez les noms des personnes qui partagent l'addition. La calculatrice répartit automatiquement la TVA et le pourboire proportionnellement et affiche le coût par personne.

Fonctionnalités

• Partage égal ou personnalisé · divisez à parts égales ou attribuez des articles à des personnes précises
• Pourboire flexible · saisissez un montant ou utilisez des pourcentages prédéfinis
• Calcul automatique · TVA et pourboire répartis proportionnellement entre tous les participants

Questions fréquentes

Comment la TVA et le pourboire sont-ils répartis ?

La TVA et le pourboire sont répartis équitablement entre toutes les personnes du partage. La part de chaque personne est calculée en divisant le total par le nombre de participants.

Puis-je utiliser un pourcentage ou un montant fixe pour le pourboire ?

Oui ! Vous pouvez saisir le pourboire en pourcentage du sous-total ou en montant fixe. Utilisez les boutons prédéfinis (15 %, 18 %, 20 %, 25 %) pour une sélection rapide.

Mes données sont-elles enregistrées ?

Non. Tous les calculs ont lieu dans votre navigateur. Rien n'est envoyé à un serveur ni sauvegardé.

A short history of splitting the bill

Sharing food costs is as old as eating in groups, Greek syssitia, Roman convivia, medieval guild dinners, tavern gatherings all involved some version of cost-sharing, often with the host absorbing the bill as a status display. The expression "going Dutch" (each person pays their own share) surfaces in English in the late 19th century; the OED's earliest citation is 1873. Anthropologist David Graeber argued in Debt: The First 5,000 Years that immediate exact reciprocation ("I owe you exactly $14.27") is historically unusual even among friends, and that the precision-splitting now made trivial by smartphones marks a behavioural shift, not just a technological one.

Two near-simultaneous launches turned bill splitting from arithmetic into infrastructure. Venmo was founded in 2009 by Andrew Kortina and Iqram Magdon-Ismail (originally as an SMS-based way for one cofounder to pay back a friend who had covered him at a bar). PayPal acquired Venmo in 2013, and by the mid-2010s "Venmo me" had become a verb in American English. Splitwise was founded by Anand Sharma at Y Combinator in 2011 specifically to track group expenses across roommates, trips and households without forcing settlement after every transaction; its IOU ledger model (balances accumulate and only periodically settle) made it the dominant tool for shared housing and travel. Other arrivals followed: Cash App (2013), Apple Cash (2017), Zelle (2017), Tricount (Belgium, 2010, acquired by Bunq 2022), Settle Up (Czech Republic, 2010), and Wise's multi-currency wallet for international group trips.

The math, in plain language

Even split, simplest case: total = subtotal + tax + tip; each person pays total ÷ N, with a tiny rounding adjustment so the sum equals the bill exactly. Subtotal $80, 9% tax ($7.20), 20% tip ($16), 4 people: total = $103.20, each person = $25.80. Sum check: 4 × $25.80 = $103.20.

Itemised split with shared tax and tip: each person's items are added up, then tax and tip are split proportionally (the bigger eater also covers a bigger slice of tax) or evenly across the table. The proportional method is mathematically cleaner; the equal-tip method is socially common because tipping is often felt as a service charge for the table rather than a function of any one diner's appetite.

The rounding residual. Three people splitting $10.00 evenly = $3.3333… → if everyone pays $3.33, the total is $9.99, one cent short. Standard fixes: round everyone down then add 1¢ to whoever has the largest fractional remainder; or use banker's rounding (IEEE 754 round-half-to-even, common in financial software); or have a designated payer absorb the residual cent. This tool typically uses the third convention, the displayed per-person total is rounded for display, and the actual transfer absorbs the cent.

Tip on subtotal vs tip on subtotal-plus-tax

A surprisingly contentious detail. US convention has historically been to tip on the pre-tax subtotal: tax is a government charge, not service. In practice many POS systems and tip calculators compute tip on the post-tax total, which inflates the tip by the local sales-tax rate. In a 9.5%-tax city like San Francisco, a 20% tip on subtotal is 20% of $80 = $16; a 20% tip on total is 20% of $87.60 = $17.52. Etiquette columnists (Emily Post Institute, Miss Manners) consistently recommend the pre-tax convention but note both are accepted in practice.

Tipping conventions internationally

Tipping is one of the most-asked travel questions and the single biggest variable in cross-border bill splitting:

• United States and Canada: the global outlier. Federal tipped-minimum-wage law (FLSA) allows employers to pay tipped workers as little as $2.13/hour in cash wages, with tips expected to bring earnings to minimum wage. As a result, US tipping is part of compensation, not a thank-you. Standard rates: 15% (now considered low), 18% (sit-down minimum), 20% (modern social default), 25%+ for excellent service or large parties. Auto-gratuity of 18–20% is commonly added for parties of 6 or 8+.
• United Kingdom: service charge of around 12.5% is often included on the bill at sit-down restaurants; if not, 10–15% is typical. Pubs and casual cafés don't expect tips. The UK's Allocation of Tips Act 2023 requires service charges to flow to staff.
• Continental Europe: service is typically included by law (Italian servizio coperto, French service compris); diners round up to the nearest euro or leave 5–10% for excellent service. France's 1985 Loi 85-77 made service charges part of the menu price.
• Japan: tipping is not customary and can be felt as insulting. The price on the menu is the price you pay.
• Australia and New Zealand: no tipping culture historically; 10% for excellent service is increasingly common in upmarket Sydney/Melbourne restaurants but still optional.
• Middle East, South Asia: 10% is common; in some countries (UAE, Saudi Arabia) a service charge is often included.

Tax handling

Tax appears differently depending on jurisdiction:

• US sales tax is added to the subtotal at the register and varies by state, 0% in Oregon, Montana, New Hampshire and Delaware, up to roughly 9.5% in California cities once local additions are included.
• EU and UK VAT is included in the displayed price by law, typically 17–25% depending on country and item category. Restaurant menus show prices already including VAT; the receipt breaks it out.
• Canada GST/HST/QST is added at the register, varying by province, 5% federal GST plus provincial sales tax of 0% to 10%.

For internal splitting purposes the math is the same in every jurisdiction; the difference is whether you start from a "subtotal" you can already see on the menu (EU/UK) or have to back-out tax from a printed total to see what was on the menu (US/Canada).

When to split evenly vs by item

Even split is the social default when everyone ordered roughly comparable amounts, when the group is small enough to absorb minor inequities ("I'll cover the round next time"), or when the meal is a shared social experience and itemised arithmetic feels petty. It's the standard for first dates, work lunches, and dinners with friends.

Itemised split is the right answer when appetites or budgets differ widely, when one diner had a substantially pricier dish, when the group includes a non-drinker among drinkers (a frequent itemising trigger), when work-expense reimbursement requires per-person totals, or when a group has agreed up front to split this way. The sitcom-classic "I had a salad" objection from Friends is the canonical example of when even-splitting feels unfair.

There's a documented behavioural-economics wrinkle: in a 2004 paper in The Economic Journal, Uri Gneezy and colleagues showed that diners order more expensive items when they know the cost will be split equally, because the marginal cost to themselves is reduced. The phenomenon is sometimes called the "menu effect" or "diner's dilemma." Aware groups sometimes pre-commit to itemised splitting precisely to avoid this dynamic.

When you'd reach for a browser tool

• Quick one-meal split: no need to install Splitwise and create an account for a single coffee shop tab.
• Travel groups who don't all use the same payment app, or whose home countries' apps don't talk to each other.
• Cross-currency situations: the math is the same in any currency; do the conversion separately at the mid-market rate.
• Quick sanity check on a server's bill: running the receipt through your own arithmetic catches the occasional addition error.
• Corporate expense reports when you need a per-person total for receipt submission, especially for the IRS Publication 463 50% meals deduction in the US.
• Group travel debriefs: combining accommodation, transport and meals into one cleanly-itemised tally.

More questions

What's the right thing to say when someone proposes an even split and I had less?

Etiquette literature is generally on your side: it's reasonable to politely propose itemising before the bill arrives ("Should we just pay for what we each had?"). Most etiquette columnists draw the line at after the bill has been totalled, by then the social transaction has happened and reopening it usually costs more in awkwardness than the few dollars saved. The cleanest fix is to set expectations early: "Let's each pay our own" or "Should we split evenly?" before ordering.

Why does a 20% tip sometimes turn into 24%?

Modern POS systems often default to tip suggestions calculated on the post-tax total, then express them as percentages, so the displayed "20%" is 20% of (subtotal + tax). On a 9.5%-tax city bill, that's effectively a 21.9% tip on subtotal. Some systems also default to 20/22/25% prompts rather than the older 15/18/20%, which has the same upward-pressure effect. If tipping on subtotal matters to you, do the math yourself: tip = subtotal × your-percent.

Should the rounding cent matter?

Almost never. Reasonable groups absorb a one- or two-cent residual without comment, and the actual transfer (whoever pays the card) carries the rounding error. The mathematical purist's answer is the largest-remainder method, which distributes the residual cents to the diners with the largest fractional remainders, but in practice no one cares.

Does anything get sent to a server?

No. The split is computed by JavaScript in your browser; nothing is uploaded; the page works offline once it's loaded. Useful when you want to sanity-check a bill at a restaurant table without inviting an app to track your dining history.

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