🧮 Calculators & Daily Life

Bill Splitter

Enter the total and headcount — each person's share appears right away. Pick how to handle remainders, or set a separate adjustment for the organizer. Everything stays in your browser.

Examples (click to try)

How to Use the Bill Splitter

New here? Tap one of the Examples (click to try) buttons above — the amount, headcount, and rounding fill in automatically and the result appears instantly. Once you're comfortable, type in your own numbers. As you edit any field or switch the rounding method, the per-person share, total to collect, and any difference recalculate live — no button to press.

  1. Enter the Total Amount (use the tax-included total).
  2. Enter the Number of People.
  3. Choose a Rounding Unit and Rounding Method. 10 units + Round Up is a popular choice.
  4. Optionally enable Separate organizer share — everyone except the organizer splits the bill, and the difference is shown as the organizer's adjustment.

Worked Example (total → per person)

Say the bill is ¥10,000 for 4 people, rounded up to 10 units: 10,000 ÷ 4 = ¥2,500 exactly, so each person pays ¥2,500, ¥10,000 is collected, and the difference is ¥0. A ¥3,600 bill for 3 people also divides cleanly into ¥1,200 each. When it doesn't divide evenly — say ¥10,000 for 3 people — 10,000 ÷ 3 ≈ ¥3,333.3, rounded up to the nearest 10 gives ¥3,340 per person. Collecting 3,340 × 3 = ¥10,020 brings in ¥20 more than the bill (a surplus) that the organizer can keep or roll over. Choosing Round Down instead gives ¥3,330 each and ¥9,990 collected, leaving a ¥10 shortfall for the organizer to cover.

Rounding Method Explained

  • Round Up: The total collected always meets or exceeds the actual bill — no shortfall. Any surplus can go back to the organizer or roll over.
  • Round Down: The lowest per-person amount, but the organizer covers any gap.
  • Round to Nearest: A middle ground between the two options above.

What Is "Separate Organizer Share"?

When this option is enabled, the remaining members (excluding the organizer) each pay an equal share. The difference between what is collected and the actual total is displayed as how much the organizer receives or needs to contribute — handy when the organizer paid the bill upfront.

Frequently Asked Questions

Is my data sent to a server?
No. All calculations happen entirely in your browser. The amounts and headcounts you enter are never transmitted to or stored on any external server. You can use this tool with complete confidence.
Which rounding method should I choose?
Round Up is recommended — the total collected will always meet or exceed the actual bill, so there is no shortfall. Round Down gives each person a slightly lower share but leaves the organizer to cover any gap. Round to Nearest falls in between. You can round to the nearest 1, 10, or 100 unit.
What does "Separate organizer share" do?
When enabled, the remaining members (excluding the organizer) split the bill among themselves. The difference between what is collected and the actual total is shown as the amount the organizer receives or needs to cover — very useful when the organizer has already paid the bill upfront.