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Bill Split Calculator

Add a tip to a restaurant bill and split the total equally between everyone.

Enter the bill total, the tip percentage (0 for none), and the number of people, then calculate.

Shares rounded to cents may differ from the exact total by a few cents; service charges already on the bill are not added again.

Methodology

Calculator version
1.0.0
Formula version
equal-share-with-tip-v1
Latest formula review
2026-09-21

Formula or transformation

Applies the tip percentage to the bill, adds it, and divides the total equally between the people.

Variables

  1. Bill total
  2. Tip percentage
  3. Number of people
  4. Equal share per person

Units

  • Currency
  • Percent
  • Person

Rounding policy

Canonical arithmetic retains declared precision before currency display rounding.

The tip percentage is applied to the bill and added to it, then the total is divided equally by the number of people.

Add a tip to a restaurant bill and split the total equally between everyone.

Reviewed sources

  1. NIST — Rules and style conventions for expressing values Reviewed on 2026-09-21

Formula review history

  1. Initial percentage and equal-share review.

    Reviewed 2026-09-21 for formula version equal-share-with-tip-v1

Assumptions

  • Inputs are interpreted using the displayed units and options.
  • The calculation follows the methodology and factors listed in the sources.

Limitations

  • Display rounding can hide additional decimal places.
  • The calculation cannot add accuracy that is absent from the submitted inputs.
  • Shares rounded to cents may differ from the exact total by a few cents; service charges already on the bill are not added again.

Worked example

A bill of 240 with a 10% tip comes to 264, or 66 each for four people.

Frequently asked questions

Is the tip calculated on the bill before or after tax?

On the amount you enter as the bill total. Enter the total with tax if you tip on the taxed amount, or the pre-tax subtotal otherwise.

Why do the shares not add up exactly to the total?

Each share is rounded to cents for display; multiplying it back by the number of people can differ from the total by a few cents.