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Bill Split Calculator

Shared plates split among the people who shared them. Tax and tip follow what each person ordered.

Who's Splitting

Who Had What

Each Person Pays

  • Me Items $36.00 $46.40
  • Jamie Items $38.00 $48.97
  • Jess Items $14.00 $18.04
  • Marcus Items $64.00 $82.48
Items
$152.00
Tax
$13.49
Tip, 20%
$30.40
Bill Total
$195.89

The 4 shares add up to exactly $195.89.

Add items to see who pays what

splitty does this from a photo of the receipt. Get the App

All the math happens in your browser. Nothing you type leaves this page.

How the Math Works

Every amount is handled in whole cents. Each item's price divides evenly among the people who shared it, and only them.

Tax is allocated in the same ratio as the item subtotals: order 30% of the food, pay 30% of the tax. The tip is a percentage of the items before tax, and those tip dollars are allocated the same way.

Odd cents go to whoever's share was rounded down the most, so the shares always add up to the bill. Split $100.00 three ways and you get $33.34 + $33.33 + $33.33, not three $33.33s and a vanished penny.

An even split of the $195.89 bill above would charge Jess $48.97, a $30.93 overpayment.

Questions

How does this calculator split tax and tip?
Proportionally to what each person ordered. First every item's price is divided among the people who shared it, which gives each person an item subtotal. Then tax and tip are allocated in the same ratio as those subtotals: if your items are 70% of the food, you pay 70% of the tax and 70% of the tip. It's the same rule the splitty app uses when it reads a receipt.
How are shared items handled?
A shared item splits evenly among the people who shared it — and only them. If three of you split $10.00 of fries, the calculator assigns $3.34 + $3.33 + $3.33, so the item still adds up to exactly $10.00. People who didn't touch the fries pay nothing toward them.
Why do the per-person totals always add up to the bill?
The calculator works in whole cents and uses largest-remainder rounding: it hands out the base amount to everyone, then distributes the few leftover cents one at a time to the shares that were rounded down the most. The result always sums to the exact bill — no missing penny, no invented penny.
Isn't multiplying everyone's items by 1.2-something the same thing?
Almost, and that's the problem. A flat multiplier (items × 1.23, say) approximates proportional allocation, but rounding each person independently means the shares rarely sum to the real total — someone silently eats the difference. It also breaks when tax is a fixed dollar amount rather than a clean percentage. This calculator allocates the actual tax and tip dollars instead, so the split is exact.

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