What this calculator does
A budget planner shows where monthly income is going and whether the plan leaves money spare. This version also spreads annual costs into a monthly amount and includes a buffer for ordinary surprises.
Formula used
Total planned spending, monthly share of annual costs and buffer are subtracted from take-home income. Key categories are also shown as a share of income.
How to read the result
A budget is most useful when it matches real behaviour. Compare this plan with actual bank transactions and adjust categories over time, especially irregular bills that do not arrive every month.
Assumptions
- Uses monthly amounts.
- Annual costs are divided by 12.
- Does not connect to bank accounts.
- Does not judge whether a category is good or bad for your situation.
Sources and checks
This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.
Frequently asked questions
What if the leftover is negative?
A negative leftover means the plan spends more than the income entered. Reduce a category, raise income or decide which costs need priority attention.