Bill Splitting Calculator
Split a bill with tax and tip evenly or by uneven shares, with amounts that add up exactly to the cent.
Your inputs
Results
Total to split
$147.60
- Per share
- $36.90
- Amounts (adds up exactly)
- 36.90 + 36.90 + 36.90 + 36.90
✓Exact calculation — rounded only for display
| Person | Shares | Pays |
|---|---|---|
| 1 | 1 | $36.90 |
| 2 | 1 | $36.90 |
| 3 | 1 | $36.90 |
| 4 | 1 | $36.90 |
What this calculator does
When people order different amounts, shares let you split fairly. Amounts are distributed in cents so they always add up to the exact total.
Formula and method
Total = subtotal × (1 + tax + tip); each share = total × share ÷ Σ shares, with leftover cents assigned by largest remainder.
Worked example
Calculated by this tool with its default inputs:
Inputs
- Subtotal: 120 (any currency)
- Tax: 8 %
- Tip / service: 15 %
- Shares per person (e.g. 1, 1, 2 — someone who ate double gets 2): 1, 1, 1, 1
Results
- Total to split: 147.6
- Per share: 36.9
- Amounts (adds up exactly): 36.90 + 36.90 + 36.90 + 36.90
How to read the results
A person with share 2 pays twice as much as someone with share 1.
Assumptions and limitations
- Tax and tip are applied to the whole subtotal.
Questions
Why does one person pay a cent more?
When the total cannot be divided evenly into cents, the extra cent goes to the share with the largest remainder.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 4 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy