Monthly budget calculator for spending, saving and cash flow
Enter monthly take-home income, ordinary expenses and a savings target. HitEquals totals each category, shows its share of income and identifies a surplus or shortfall without forcing a generic spending rule.
Inputs used by this calculator
Budget Calculator uses the fields below. The starting values reproduce the page example; replace them with values from the same units and time period before using the result.
| Input | Starting example | Accepted value | How it is used |
|---|---|---|---|
| Monthly take-home income ($) | 6,000 | 0 to 1000000000000 | Supplies the monthly take-home income ($) quantity used by the published equation or result breakdown. |
| Housing ($) | 1,800 | 0 to 1000000000000 | Supplies the housing ($) quantity used by the published equation or result breakdown. |
| Utilities ($) | 300 | 0 to 1000000000000 | Supplies the utilities ($) quantity used by the published equation or result breakdown. |
| Food ($) | 600 | 0 to 1000000000000 | Supplies the food ($) quantity used by the published equation or result breakdown. |
| Transportation ($) | 500 | 0 to 1000000000000 | Supplies the transportation ($) quantity used by the published equation or result breakdown. |
| Insurance and health ($) | 300 | 0 to 1000000000000 | Supplies the insurance and health ($) quantity used by the published equation or result breakdown. |
| Debt payments ($) | 500 | 0 to 1000000000000 | Supplies the debt payments ($) quantity used by the published equation or result breakdown. |
| Personal and entertainment ($) | 400 | 0 to 1000000000000 | Supplies the personal and entertainment ($) quantity used by the published equation or result breakdown. |
| Savings goal ($) | 500 | 0 to 1000000000000 | Supplies the savings goal ($) quantity used by the published equation or result breakdown. |
| Other spending ($) | 200 | 0 to 1000000000000 | Supplies the other spending ($) quantity used by the published equation or result breakdown. |
What the monthly budget shows
The result compares money available after payroll deductions with the costs and saving amounts entered. It reports both a dollar remainder and a percentage of income.
Budget formulas
Every category is added once. Planned saving is treated as an intentional outflow so the remainder measures cash left after funding that goal.
remainder=income−expenses−planned savingcategory share=category÷income×100annual equivalent=monthly amount×12Worked monthly example
For $6,000 of income, add housing, utilities, food, transportation, insurance, debt, personal, other and planned saving. Subtract their total to find the buffer.
Use real statements
CFPB guidance recommends looking back through checking and credit-card history so the estimate reflects actual spending. Include costs that occur less often by converting them to a monthly amount.
Surplus and shortfall
A surplus can fund a larger buffer, debt reduction or another priority. A shortfall identifies how much planned outflow must change or how much additional income is needed to balance the month.
Why percentages are context, not commands
Housing, transport, health and caregiving needs vary widely. Category percentages help compare scenarios, but the calculator does not label a household's choices as right or wrong.
Budget categories
| Category | Examples |
|---|---|
| Housing | Rent or mortgage, association fees |
| Utilities | Electricity, water, internet, phone |
| Food | Groceries and dining |
| Transportation | Payments, fuel, transit, maintenance |
| Insurance and health | Premiums and out-of-pocket costs |
| Other | Childcare, gifts, subscriptions, irregular costs |
Frequently asked questions
Should I use gross or take-home income?
Use monthly take-home income available after payroll deductions.
Why is saving an outflow?
It reserves money for the entered goal before calculating the buffer.
How do I include annual bills?
Divide the expected annual amount by 12 and add it to a suitable category.
What does a negative result mean?
Planned monthly spending and saving exceed entered income.
Does the tool enforce the 50/30/20 rule?
No. It reports your actual categories without imposing one allocation rule.
Are my values uploaded?
The calculation runs locally in the browser.
What to keep in mind
Categories are a planning structure, not a rule about what a household should spend. Irregular bills, taxes withheld before take-home pay and annual costs may require separate monthly sinking funds.
Results are rounded for display in US format, with money in dollars and cents; CSV exports keep full calculation precision. This is a calculation summary, not an official certificate.