Last updated: August 22, 2026
Free Budget Calculator
This calculator applies the zero-based budgeting method — enter your income and your planned spending in each category, and it shows you exactly how much is left unassigned. The goal is to get that remaining number to zero, meaning every dollar has a job. See our full zero-based budgeting guide for the complete method this tool is built around.
A Starting Point If You're Not Sure Where to Begin
If you're staring at a blank category list with no idea what to enter, a common reference point is the 50/30/20 split — roughly 50% of take-home income toward needs, 30% toward wants, and 20% toward savings and debt payoff — used as a rough starting allocation before you fine-tune each category to your actual numbers above.
On a $5,000 monthly take-home income, that's roughly $2,500 toward needs, $1,500 toward wants, and $1,000 toward savings or debt payoff — plug your own income into this ratio as a starting point, then adjust each category in the calculator above until the remaining amount hits exactly $0.
How to Use This Calculator
- Enter your monthly take-home (after-tax) income.
- Fill in a planned amount for each category — the default list covers common categories, but you can rename any of them or add more with the "+ Add category" button.
- Watch the "Remaining to assign" number at the bottom. The goal is $0 — every dollar of income assigned to a specific job.
- If the number is negative, you've planned more spending than you actually have — reduce a category. If it's positive, assign the leftover to savings, debt payoff, or a specific goal rather than leaving it unassigned.
Why Zero Is the Target, Not a Coincidence
A zero-based budget doesn't mean spending everything — it means every dollar, including savings and debt payoff, has an assigned category before you consider anything "extra." If this calculator shows money left over, that's not free money to spend casually; it's a signal that you haven't finished assigning your budget yet. See our complete zero-based budgeting guide for the full method, including how to handle irregular expenses with sinking funds.
Common Categories People Forget
Beyond the default categories in this calculator, a few commonly overlooked ones are worth adding: irregular expenses like car maintenance or annual subscriptions (see our sinking funds guide for how to handle these specifically), pet care, and a genuine "miscellaneous" buffer category for the small purchases that don't fit anywhere else but add up over a month. Leaving these out is one of the most common reasons a budget looks balanced on paper in this calculator but doesn't match reality once the month actually happens.
What to Do With the Number
| Result | What It Means |
|---|---|
| Exactly $0 | Every dollar has a job — this is the target |
| Positive number | You have unassigned income — direct it to savings, debt, or a specific sinking fund category |
| Negative number | Your planned spending exceeds your income — reduce a category or find additional income |
Frequently Asked Questions
Does this calculator save my data?
No — this tool runs entirely in your browser. The numbers you enter aren't sent to or stored on our servers. See our Privacy Policy for more on how ClearCents handles data generally.
Can I add more categories than the default list?
Yes — use the "+ Add category" button to add as many rows as you need, and rename any existing category by editing its text field directly.
What should I do if I can't get to zero?
If your planned spending consistently exceeds your income, it's worth reviewing which categories are inflated relative to your actual needs, or looking into additional income — see our guide to making extra money for options.
Should I use gross or after-tax income in this calculator?
Use your after-tax, take-home income — the amount that actually lands in your bank account each pay period. Using gross income will overstate what you actually have available and make every category look more affordable than it really is.
Is this the same as the 50/30/20 method?
Not exactly — this calculator uses zero-based budgeting, where you assign every dollar its own specific category rather than three broad buckets. The 50/30/20 split is a useful starting ratio for filling in the categories above, but the underlying method here is more granular.
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Where to Go Next
Related guides on ClearCents:
Build the Habit, Not Just This Month's Budget
Run this calculator every time your income or expenses change, not just once. A budget that stays accurate over time is worth far more than a perfect one-time snapshot.
Want the full method behind this calculator? Our complete zero-based budgeting guide walks through the reasoning step by step.