Bill Split Calculator
Inputs
| Total bill | 120 $ |
|---|---|
| Number of people splitting evenly | 4 |
| Fixed contributions (total) | 0 $ |
| Round to nearest | 1 $ |
Bill Split Calculator
Split a shared bill evenly across any number of people, with optional fixed contributions and practical rounding controls.
Inputs
Bill details
Rounding
Results
Enter a value to see results.
Details
4 people each pay ...; remainder ....
The rounding gap
"$100 split three ways" looks easy until your calculator says $33.333… Nobody pays that. In practice one person pays $34 and the others pay $33 — and that $1 gap just disappears into someone's pocket or gets silently forgotten. This calculator shows that gap explicitly so your group can decide what to do with it.
Four inputs
| Field | Example |
|---|---|
| Total bill | $120 |
| Number of people splitting evenly | 4 |
| Fixed contributions (total) | $0 — or the combined total already paid by others |
| Rounding unit | $1 (or 0.01 / 10 / 100 / 1000) |
Set your preferred currency in settings and the rounding-unit default adapts automatically — $1 for USD, ¥100 for JPY, ₩1,000 for KRW, etc.
The math
per person=⌊n⋅utotal−fixed⌋⋅u remainder=(total−fixed)−per person×nShares are always rounded down, so the per-person amount is never inflated. Whatever does not fit into equal rounded shares surfaces as the remainder.
Using fixed contributions
The most common real-world case: a few people each threw in a lump sum before the bill arrived, and the remaining cost is split evenly among the rest.
Example: Dinner for 8, total ¥32,000. Three people already paid: ¥5,000, ¥4,000, and ¥3,000.
- Fixed contributions: ¥12,000
- People splitting evenly: 5
- Remainder to split: ¥32,000 − ¥12,000 = ¥20,000
- Rounding unit: ¥100 → per person: ¥4,000; remainder: ¥0
Because the amounts were different, you just add them and enter the total — no need to specify how many people paid or how much each one paid.
If nobody paid anything upfront, leave Fixed contributions at 0 and enter the full headcount under "Number of people splitting evenly." The calculation is a plain even split.
What to do with the remainder
That is entirely up to the group. Common choices:
- Leave it as an extra tip
- Have whoever is paying first cover it
- Collect one extra coin from whoever is willing
- Round up slightly on the next split to balance it out
The calculator shows it so nothing disappears into the air. What you do with it is your call.
Picking a rounding unit
Match the smallest denomination you actually want to deal with:
- 0.01 (cent / fen / paise) — card payments or when every cent matters
- 1 — the typical cash default in USD, EUR, GBP, AUD, CAD
- 10 / 100 / 1000 — common in JPY, KRW, VND, and other currencies where small coins aren't worth the friction
In Japan, rounding to ¥100 or ¥1,000 is the cultural norm for group meals. The calculator adjusts the default automatically when you switch currency.
This calculator vs. the tip calculator
This tool divides a finished grand total — tax and tip already included.
- Need to compute the tip first? Use the Restaurant Tip Calculator and bring the grand total here.
- Splitting a non-restaurant expense (trip cost, group gift, shared subscription)? Works exactly the same.
Frequently Asked Questions (FAQ)
How does the fixed contribution work?
Enter the combined total of everything already paid by people who are outside the even split. Example: dinner is $120, two people paid $20 and $15 in advance → enter $35 in "Fixed contributions". The remaining $85 is then split among however many people are splitting evenly. Each person's share is rounded down to the chosen unit, and any leftover is shown as the remainder.
What rounding unit should I pick?
Match the smallest banknote or coin you want to deal with. For card splits, 0.01 keeps things exact. For cash in dollars or euros, 1 avoids fishing out coins. In Japan, 100 or 1000 (yen) is the cultural norm — nobody pays 4,743 yen; they pay 4,800 or 5,000.
What should I do with the remainder?
That is up to you. Common options: leave it as a tip, have one person cover it, collect an extra coin from whoever is willing, or simply ignore it if it is small. The calculator shows it so nothing is forgotten — what you do with it is your call.
Should I include tax and tip before splitting?
Yes — enter the final grand total including tax and tip. To compute the tip first, use the Tip Calculator and bring the total here.
Disclaimer
Per-person amounts are always rounded down. The remainder is the difference between the total and the sum of all rounded shares.