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Zero Based Budget Calculator

Plan a budget where every dollar has a job. Enter your monthly income and category amounts, then press Calculate to see how much is still waiting to be assigned.

Written by TopicDrill Editorial Team·Updated June 2026

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Income & categories

Give every dollar a job until the leftover hits zero.

$
$
$
$
$
$
$
$
$

Left to assign

$0

Every dollar assigned
Monthly income$5,000
Total assigned$5,000
Biggest categoryRent / Housing (30%)

Where each dollar goes

$5,000assigned
  • Rent / Housing30%
  • Savings16%
  • Groceries12%
  • Everything else12%
  • Debt repayment10%
  • Fun & dining8%
  • Transportation7%
  • Utilities5%

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How the zero based budget calculator works

Zero based budgeting starts from a blank slate every month. Rather than tweaking last month numbers, you list your take-home income and then assign it, category by category, until the amount left to allocate is exactly zero. This calculator keeps a running tally of what you have assigned and subtracts it from income so you always know how far you are from a balanced plan.

The donut chart turns your numbers into a picture, showing what share of income each category claims. Seeing that housing eats forty percent of the pie, or that savings is a thin sliver, often prompts the small adjustments that make a budget stick.

A quick example

Say you bring home 5,000 dollars a month. You assign 1,500 to housing, 600 to groceries, 350 to transport, 250 to utilities, 800 to savings, 500 to debt payoff, 400 to dining and 600 to everything else. That adds up to exactly 5,000 dollars, so the amount left to assign is zero and the budget is balanced. If you had only assigned 4,400, the calculator would show 600 dollars still needing a job.

Things to keep in mind

Treat savings, investing and debt payoff as real categories, not afterthoughts, so they compete for dollars on equal footing. For a plain-language introduction to budgeting approaches, the CFPB budgeting guide is a solid neutral resource. Once your savings line is set, our future value calculator can show how that monthly amount grows over time.

Frequently asked questions

What is a zero based budget?

A zero based budget is a plan where your income minus all of your assigned spending and saving equals zero. Instead of leaving money unlabeled, you give every dollar a specific job, whether that is rent, groceries, savings or fun, until nothing is left unassigned.

Does a zero balance mean I spend everything?

No. Reaching zero means every dollar has a destination, and saving and investing are destinations too. A common budget might assign 20 percent to savings and debt payoff. The goal is intention, not emptying your account each month.

What if I have money left over after assigning categories?

Leftover money means the budget is not yet zero based. Decide on a job for it, such as adding to an emergency fund, paying down a loan faster or topping up investments. The calculator shows the remaining amount so you know exactly how much still needs a home.

How is this different from the 50/30/20 rule?

The 50/30/20 rule splits income into three fixed buckets for needs, wants and savings. Zero based budgeting is more granular and flexible: you build your own categories and amounts from scratch each month, which suits variable income and changing priorities better.

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