Formulas
Direct: each part = total × its weight ÷ sum of the weights. Inverse: each part = total × (1 ÷ its weight) ÷ sum of (1 ÷ weights).
Example
Splitting $1,200 in the proportion 2 : 3 : 5 gives $240, $360 and $600. Each unit of weight is worth $120.
Uses
- Sharing a bill by consumption or income.
- Dividing profit between partners by what each invested.
- Inverse split: a bonus that is smaller for whoever missed more days.
To split a bill equally with tip, use the split bill calculator.
Frequently asked questions
Can the weights be percentages?
Yes. Any numbers work, because only the proportion between them matters: 20, 30 and 50 give the same result as 2, 3 and 5.
Why do the parts sometimes not add up exactly?
Each part is rounded to cents. The difference is at most a cent or two.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.