Zero-Based Budget Calculator

Enter Calculation

Monthly Income ($)

Housing ($)

Food & Groceries ($)

Transportation ($)

Utilities ($)

Savings & Investing ($)

Debt Payments ($)

Other / Discretionary ($)

Formula

Show calculation steps (1)

1. Percent Allocated

   

   Allocated is the sum of all budget categories; the percentage shows how much of income has been assigned.

Results

Unassigned Money

$0

Balanced — every dollar is assigned!

Monthly Income	$5,000
Total Allocated	$5,000
% of Income Allocated	100%

What Is a Zero-Based Budget?

A zero-based budget is a method where you give every single dollar of your income a job — spending, saving, or paying down debt — until the amount left to assign is exactly zero. Unlike percentage-based rules, zero-based budgeting forces intentional choices about every dollar, which is why it is the backbone of popular systems like the envelope method and the "give every dollar a job" philosophy. The formula is universal and works in any currency.

In a zero-based budget every dollar of income is assigned to a category until the leftover reaches zero.

How to Use This Calculator

Enter your total monthly income at the top, then distribute it across the category fields: housing, food, transportation, utilities, savings, debt, and discretionary spending. The calculator subtracts the sum of all categories from your income to show your unassigned balance. Keep adjusting the categories until the unassigned amount reads $0 — at that point your budget is balanced and every dollar has a purpose.

The Formula Explained

The core equation is simply

$$\text{Unassigned} = \text{Income} - \left( \text{Housing} + \text{Food} + \text{Transport} + \text{Utilities} + \text{Savings} + \text{Debt} + \text{Other} \right)$$

A positive unassigned balance means you still have money to assign. A negative balance means you have over-budgeted and need to cut a category. When the balance equals zero, the budget is balanced.

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Unassigned equals income minus the sum of all allocations — aim for zero.

Worked Example

Suppose your monthly income is $5,000. You allocate $1,500 to housing, $600 to food, $400 to transportation, $300 to utilities, $800 to savings, $500 to debt, and $900 to discretionary spending. The allocations total $5,000, so the unassigned balance is

$$\$5{,}000 - \$5{,}000 = \$0$$

Your budget is balanced.

FAQ

What if my unassigned balance is negative? You have assigned more money than you earn. Reduce one or more categories until the balance returns to zero.

Does a $0 balance mean I spend everything? No. Savings and debt payments are categories too, so "assigning" a dollar includes saving or investing it.

Can I add my own categories? Use the "Other / Discretionary" field to lump in any spending not covered by the named categories.