Business
Invoicing, margin & GST calculators
Bill Split Calculator — Split the Tab with Tip
To split a bill with tip, first compute the tip on the base, then divide the total by the number of people: tip = base × tip%, total = bill + tip, per_person = total / people. On a $50 bill at 20%, the tip is $10 and the total is $60; split four ways that is $15 per person. By default the tip is figured on the bill as entered, but you can switch to tip-before-tax (US convention is to tip on the pre-tax amount) — on a $50 bill that includes $4 tax, a 20% tip on the $46 pre-tax base is $9.20 rather than $10. For an uneven split, allocate each person's share and let the remainder cent fall to one person so the parts still sum to the total. Enter the bill, tip percentage and headcount above to split it instantly. Free, no login.
Tip: tip = base × tip% where base = bill (or the pre-tax amount if tip-before-tax is on)
- Total and split: total = bill + tip; per_person = total / people
- Worked example — $50 bill, 20% tip: tip = $10, total = $60; split 4 → $15 per person
- Tip-before-tax — $50 incl. $4 tax at 20%: tip on the $46 base = $9.20 (vs $10 on the full amount)
- Round-up: round the total (or per-person) up to a chosen increment; effective % = (rounded − bill) / base
- Uneven split: allocate each share and give the leftover cent to one person so the parts sum to the total
- Guard: 0 people or a $0 bill has no valid split — enter at least one person and a positive bill
Frequently asked questions
How do I split a bill with tip between 4 people?
Add the tip, then divide by the headcount. On a $50 bill at 20%, the tip is $50 × 20% = $10 and the total is $60; split four ways that is $60 / 4 = $15 each. If you tip on the pre-tax amount instead (the usual US convention), compute the tip on the bill minus tax first. For an even split the calculator divides the total by the number of people; for an uneven split it allocates each person's share and rounds so the parts still add up to the exact total.
Should the tip be calculated before or after tax?
In the US it is customary to tip on the pre-tax amount, though tipping on the full (post-tax) bill is common and simply a bit more generous. The difference is real: on a $50 bill that includes $4 of tax, a 20% tip on the $46 pre-tax base is $9.20, versus $10.00 on the full $50. The calculator defaults to the bill as entered and offers a tip-before-tax toggle, so you can choose whichever you prefer — it presents the options rather than prescribing a norm.
How does rounding up the total change the tip?
Rounding up raises the effective tip percentage, and the calculator shows by how much. If you round the total up to a chosen increment, the effective tip is (rounded_total − bill) / base. For example a $47.83 bill with a 20% tip comes to a $57.40 total; rounding up to $60 makes the effective tip 60 / 47.83 − 1 ≈ 25.4%. Surfacing the effective percentage lets everyone see what the convenient round number actually cost before splitting it.