Tip Calculator
Calculate tip and split the bill among any number of people.
About the Tip Calculator
The Tip Calculator splits a restaurant bill across a group and computes the tip at any percentage. Enter the bill subtotal, choose a tip percentage, optionally split across multiple diners, and apply rounding if you want to avoid small change. The math is simple — tip = bill * pct / 100, total = bill + tip, per_person = total / people — but the cultural context around tipping is not.
Tipping conventions vary dramatically by country. In the United States, tipped workers can legally be paid as little as $2.13 per hour under federal law (29 U.S.C. Sec. 203(m)), with the expectation that tips make up the difference to the standard minimum wage. The standard US tip range is 15-20% for sit-down restaurant service, with 18% becoming the modern default in many urban areas. Pre-tax or post-tax is a frequent question — convention is to tip on the pre-tax subtotal, but tipping on the post-tax total is also acceptable.
In contrast, tipping is uncommon or even offensive in Japan and South Korea, where service charges are included in the menu price. In the United Kingdom, a 10-12.5% service charge is often added automatically; if not, a 10% tip is standard. In much of continental Europe, a 15% service charge is included by law; rounding up the bill or leaving small change is the typical gesture. Always check the bill for ‘service compris’ (France), ‘servizio incluso’ (Italy), or ‘servicio incluido’ (Spain) before tipping.
The calculator’s rounding modes handle the common case of wanting to leave a clean tip amount. ‘Round tip up’ rounds the tip to the next whole dollar; ‘Round total up’ does the same for the total; ‘Round per-person to nearest $0.50’ is convenient when splitting across a group of friends.
How It Works
The tip is computed as bill * (pct / 100). For a $50 bill at 18%, the tip is 50 * 0.18 = $9.00. The total is bill + tip = $59.00. Per-person splitting divides the total by the headcount: $59.00 split 4 ways is $14.75 each.
The rounding modes apply after the basic calculation: Round tip up uses Math.ceil(tip) to round up to the next whole dollar. Round total up applies Math.ceil(total) and recomputes the tip as total - bill, so the effective tip rate rises slightly. Round per-person to nearest $0.50 uses Math.ceil(perPerson * 2) / 2, which always rounds up to the next half-dollar.
The effective tip rate is reported as (tip / bill) * 100. This catches the case where rounding pushed the effective rate above the chosen percentage — for example, a $10 bill at 18% gives a $1.80 tip, but rounding the tip up to $2.00 raises the effective rate to 20%.
Edge cases: a zero bill returns a zero tip and zero total. A negative bill is rejected as invalid. A tip percentage above 100% is rejected — though in some tipping cultures (notably the US for exceptional service), a tip above 20% is not unusual. The cap exists to prevent typos like entering 180 instead of 18.
Worked Examples
Default values: $50 bill, 18% tip, 1 person. Tip = $9.00, total = $59.00, per person = $59.00. Effective rate = 18.0%. A standard US single-diner tip.
$120 bill, 20% tip, 4 people, no rounding. Tip = $24.00, total = $144.00, per person = $36.00. A standard US group dinner split.
$50 bill, 18% tip, 1 person, ‘Round tip up’. Tip = $9.00 -> rounded up to $9.00 (already a whole dollar). Total = $59.00. The rounding has no effect when the tip is already a whole dollar.
$42.50 bill, 15% tip, 3 people, ‘Round per-person to nearest $0.50’. Tip = $6.38, total = $48.88, per person = $16.29 -> rounded up to $16.50. Adjusted total = $49.50, effective tip rate = (49.50 - 42.50) / 42.50 * 100 = 16.5%.
$0 bill, 18% tip, 1 person. Tip = $0.00, total = $0.00, per person = $0.00. The calculator accepts a zero bill without complaint.
When to Use This Tool
- Splitting a restaurant bill across a group of friends without doing mental math at the table.
- Choosing an appropriate tip percentage based on service quality (15% for adequate, 18% for good, 20%+ for exceptional).
- Verifying that an automatically-added 18% ‘large party’ service charge was actually computed correctly.
- Calculating the tip on a pre-tax subtotal when the bill shows tax separately.
- Computing take-out or delivery tips — delivery drivers typically receive 10-15%, take-out often 0-10%.
- Figuring out an even per-person split when one diner ordered significantly more than others.
- Tipping at a hotel — housekeeping ($2-5/night), bellhop ($1-2/bag), room service (15-20% unless already included).
Limitations & Disclaimer
The calculator computes simple percentage tips and does not model service charges, automatic gratuities for large parties, or split-check itemization. Tipping conventions vary by country and culture — the default 18% reflects modern US urban norms and may not be appropriate elsewhere. Tipped minimum wage laws vary by US state; check your local labor code for the rules that apply. This tool is for personal use only and does not constitute legal or financial advice. See our disclaimer for full terms.
Frequently Asked Questions
Should I tip on the pre-tax or post-tax amount?
US convention is to tip on the pre-tax subtotal. For a $50 bill with $4 tax, an 18% tip is $9.00 (on $50), not $9.72 (on $54). However, tipping on the post-tax total is also acceptable and is increasingly common in cities with high sales tax. Either choice is socially acceptable; the difference is small.
What is the federal tipped minimum wage?
Under the Fair Labor Standards Act (29 U.S.C. Sec. 203(m)), the federal tipped minimum wage is $2.13 per hour, unchanged since 1991. Employers can claim a ‘tip credit’ of up to $5.12 per hour (the difference between the regular $7.25 minimum and the tipped $2.13 rate). If tips do not bring the worker to $7.25/hour averaged over a workweek, the employer must make up the difference. Some states (California, Oregon, Washington, Alaska, Montana, Minnesota, Nevada) require the full state minimum wage for tipped workers, with no tip credit.
Is tipping mandatory in the US?
Tips are legally voluntary — you cannot be forced to tip. However, many restaurants add an automatic 18% service charge for parties of 6 or more, which is a contractual charge (not a tip) and is taxable as restaurant revenue. If a service charge is added, additional tipping is optional. Some restaurants have moved to ‘no tipping’ models with higher menu prices; in those, leaving a tip may be declined.
What should I tip for takeout?
Takeout tipping is optional — 0 to 10% is common, with many people leaving nothing for pure takeout. If the restaurant has a dedicated takeout counter with significant packaging work (salads assembled, sauces portioned), 10% is a thoughtful gesture. For delivery, 10-15% is standard, with a $5 minimum for small orders.
How does this calculator handle rounding?
Four rounding modes are available. ‘No rounding’ returns the exact tip and total. ‘Round tip up’ uses <code>Math.ceil(tip)</code> to round the tip to the next whole dollar. ‘Round total up’ does the same for the total, recomputing the tip. ‘Round per-person to nearest $0.50’ rounds each person’s share up to the next half-dollar, with the total adjusted upward to match.
What about tipping in other countries?
Tipping conventions vary widely. In Japan and South Korea, tipping is uncommon and can be considered rude. In the UK, a 10-12.5% service charge is often automatically added; if not, 10% is standard. In France, Italy, and Spain, a 15% service charge is included by law; rounding up or leaving small change is the typical gesture. In Canada, tipping follows US conventions (15-20%). In Australia and New Zealand, tipping is uncommon but appreciated for exceptional service.
Last updated: September 9, 2026 · Author: HT99 Tools Editorial Team