Tip Calculator
Work out the tip, the total and each person’s share, on the pre-tax or post-tax bill, with a round-up option.
Result
Enter bill before tax to see the result.
https://calcgallery.com/shopping/tip-calculator/
Results are arithmetic from the amounts and rates you enter. The site publishes no tax rate, threshold or tipping convention, and rates vary by jurisdiction and change. Check the rate on your receipt, invoice or tax authority guidance, and confirm anything that matters with a qualified adviser. Read the full disclaimer
How to use the Tip Calculator
- Enter the bill before tax, and the tax if you want to tip on the post-tax figure.
- Choose whether the tip is on the pre-tax or post-tax amount.
- Enter the percentage you have decided on.
- Optionally split between people, or round the total up to a whole figure.
How it is calculated
base = subtotal (tipping pre-tax) | subtotal + tax (tipping post-tax)tip = base × ratetotal = subtotal + tax + tipPre-tax or post-tax
The one real decision on this page. On a bill of 84.50 with 6.97 of tax, a 20% tip is:
| Tipped on | Tip | Total |
|---|---|---|
| The bill before tax | 16.90 | 108.37 |
| The bill including tax | 18.29 | 109.76 |
The gap is 1.39 — about 8% more tip — because tipping on the post-tax figure tips on the tax as well. Both conventions are in common use. The page reports whichever you pick and takes no view.
No percentage is recommended. The options offered are conventions people use, not figures this site endorses. Tipping is cultural, it differs sharply between countries, and a calculator presenting a number as correct would be overstepping what arithmetic can tell you.
Rounding up
“Make it 110” is what people actually do. Choose a rounding step and the page rounds the total up, then back-solves the tip:
total = ceil(raw total ÷ step) × steptip = total − subtotal − taxOn the example bill, rounding to the nearest 5 gives a total of 110.00 and a tip of 18.53. Rounding the tip instead and recomputing would leave the total at 110.14, which is not what anyone meant.
Splitting
Shares are apportioned so they sum to the total exactly. 108.37 between three is 36.13, 36.12 and 36.12. Rounding each share on its own would give three payments of 36.12 and leave the table 1 cent short — the sort of error that is invisible until someone checks.
Practical tips
Decide the base before the percentage. Moving from pre-tax to post-tax at the same rate changes the tip more than most people expect.
Rounding up is usually a bigger tip than it looks. On the example it takes 20% to about 21.9% of the pre-tax bill.
Check whether a service charge is already on the bill, particularly outside the US, before adding a tip on top.
Cash and card can differ in how much reaches the server. That is not something a calculator can account for.
With your numbers
- Tipping on the bill before tax, the base is $84.50
- The total comes to $108.37
- 20% of that base is a tip of $16.90
Quick reference
The percentage is the one you chose. Tipping is cultural rather than arithmetic, and this page recommends no figure.
| Example | Tip |
|---|---|
| 84.50 + 6.97 tax, 20% pre-tax | $16.90 |
| The same, tipped post-tax | $18.29 |
| 84.50 + 6.97, rounded up to 5 | $18.53 |
| 100 at 18%, no tax | $18.00 |
| 84.50 + 6.97 split three ways | $16.90 |
| 45.80 at 15%, two people | €6.87 |
| 120 at 10%, four people | €12.00 |
| 33.33 at 20%, three people | €6.67 |
Common questions about the Tip Calculator
- Should I tip before or after tax?
- Both are common and neither is wrong. Tipping on the pre-tax bill gives the smaller tip, and is the more usual convention where tax is a meaningful percentage. Tipping on the total is simpler because it is the number at the bottom of the bill. On the worked example the difference is 1.39. The page shows whichever you choose and does not recommend one.
- What percentage should I tip?
- This page does not say. Tipping norms differ by country, by venue and by service, and they change; presenting a figure as correct would be presenting a cultural convention as arithmetic. Several percentages are offered as options because they are the ones people commonly use, not because they are right.
- How does rounding up work?
- It rounds the total up to the next whole unit, five or ten, then works backwards to find the tip that produces it. That is what people actually do — "make it 110" — and back-solving keeps the three figures consistent. Rounding the tip instead would leave the total at an awkward number, which defeats the purpose.
- Why do the per-person shares differ by a cent?
- Because the total does not always divide evenly. 108.37 split three ways is 36.123 each, and cents cannot be split. The page gives 36.13, 36.12 and 36.12, which sum to the total exactly. Rounding each share the same way would give three payments of 36.12, leaving the table a cent short.
- Is a service charge the same as a tip?
- No. A service charge is added by the venue and appears on the bill; a tip is discretionary and added by you. Where a service charge has already been applied, tipping on top is a separate decision. This page treats whatever you enter as the bill, so if the service charge is in the subtotal it will be tipped on unless you take it out.