When to use this calculator
An income-based split is one possible household agreement, alongside equal shares or allocation by room size.
Explore the shared bills & household costs calculators for other questions in this topic. For a related calculation, use the Shared Utility Split Calculator: Allocate a utility bill between equal shares and a chosen personal adjustment.
PUTTING IT INTO PRACTICE
Rent Split by Income: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Total rent | 1,200 |
| First person income | 3,000 |
| Second person income | 1,000 |
| Result | 900 first person share |
- Check the input labels and enter the example values above.
- Apply the relationship: First share = rent × first income/(first income + second income).
- The result is 900 first person share, rounded for display.
How to interpret your result
Requires positive combined income and an agreement to split by income; the second share is total rent minus this result.
Agree the splitting rule before calculating: equal shares and income-based shares reflect different choices. Keep expenses on the same billing period and account for currency rounding when dividing a bill.
Frequently asked questions
Will rounded individual shares always add back to the bill?
Not always. Currency rounding can leave a small remainder that the group needs to allocate.
When is the rent split by income calculator useful?
An income-based split is one possible household agreement, alongside equal shares or allocation by room size.
How do I use the rent split by income calculator?
Enter total rent, first person income, second person income. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
First share = rent × first income/(first income + second income).
What should I check before using the result?
Requires positive combined income and an agreement to split by income; the second share is total rent minus this result.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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