How to use the budget calculator
- Enter your monthly take-home income: what actually lands in your account after tax, retirement contributions and other deductions.
- Fill in what you spend each month on housing, utilities and phone, groceries, transportation, insurance and debt payments. Leave any category blank if it doesn't apply.
- Enter what you put into savings each month, including retirement or investment contributions you make yourself.
- Add entertainment (eating out, streaming, hobbies) and other spending.
- Read the money left over, the share of income each category takes, and the 50/30/20 comparison underneath.
For bills that aren't monthly, such as a $1,200 yearly car insurance premium, divide by 12 and enter $100.
How the budget is calculated
Every share is measured against take-home income, so the shares plus the money left over always add up to 100%. Needs are housing, utilities, groceries, transportation, insurance and minimum debt payments. Wants are entertainment and other spending. Savings is the savings line only; any money left over is shown separately because it isn't assigned to anything yet.
Worked example
The calculator starts with $5,000 of take-home pay a month and these amounts:
- Needs: $1,500 housing + $250 utilities + $600 groceries + $400 transportation + $250 insurance + $300 debt payments = $3,300, or 66% of income
- Wants: $300 entertainment + $200 other = $500, or 10%
- Savings: $500, or 10%
- Total planned: $3,300 + $500 + $500 = $4,300, which is 86% of income
- Left over: $5,000 − $4,300 = $700.00 a month, or $8,400 a year
Against the 50/30/20 targets of $2,500, $1,500 and $1,000, needs run $800 over, wants $1,000 under and savings $500 under. Moving the $700 left over into savings would raise the savings rate from 10% to 24%, comfortably past the 20% target.
The 50/30/20 rule
The 50/30/20 rule splits take-home pay into three buckets: half for things you must pay, 30% for things you choose, and 20% for savings and paying down debt faster. Elizabeth Warren and Amelia Warren Tyagi made it popular in their 2005 book All Your Worth. It works as a quick health check, not a law.
| Take-home pay | Needs (50%) | Wants (30%) | Savings (20%) |
|---|---|---|---|
| $3,000 | $1,500 | $900 | $600 |
| $4,000 | $2,000 | $1,200 | $800 |
| $5,000 | $2,500 | $1,500 | $1,000 |
| $7,500 | $3,750 | $2,250 | $1,500 |
In high-rent cities, needs often take 60% or more, as in the example. That doesn't mean the budget has failed. It means the wants bucket has to shrink so that savings can still reach 15–20%.
Tips for a budget that holds up
- Use real numbers. Pull the last two or three months of bank and card statements and average them instead of guessing.
- Separate groceries from eating out. Groceries are a need; restaurants and takeout belong in entertainment.
- Count only minimum debt payments as needs. Anything extra you pay toward a card or loan is closer to savings, because it builds your net worth.
- Give the leftover a job. Unassigned money tends to disappear. Send it to an emergency fund, a goal in the savings goal calculator, or extra debt payments.
Frequently asked questions
Should I budget with gross or take-home pay?
Use take-home pay. Taxes and payroll deductions are gone before you can spend anything, so budgeting from gross pay makes every share look smaller than it really is. If your employer takes retirement contributions from your paycheck, you can add them to the savings line to see your full savings rate.
What if my needs are more than 50%?
Many households are above 50%, especially renters in expensive areas. Look at the largest needs first, such as housing, a car payment or insurance, because one change there frees more money than many small cuts. Until then, trim wants so savings stays near 20%.
How much should I keep in an emergency fund?
A common guideline is three to six months of essential expenses. With the example's $3,300 of needs, that is roughly $9,900 to $19,800. Our guide on emergency fund size shows how to find your own number.
Where do irregular expenses go?
Turn them into a monthly amount. Add up yearly costs such as car registration, gifts and annual subscriptions, divide by 12, and enter the result under other spending. Setting that money aside each month stops these bills from wrecking a good month.
Related calculators
- Savings Goal Calculator — How much to save each month to reach a goal by a date, or how long your current savings will take.
- Debt-to-Income Ratio Calculator — Your front-end and back-end debt-to-income ratios, compared with common mortgage lender limits.
- Take-Home Paycheck Calculator — Your net pay per paycheck after 2026 federal tax, Social Security, Medicare, state tax and 401(k) deductions.
- Compound Interest Calculator — How a starting balance and monthly contributions grow, with any compounding frequency.
Results are estimates for educational purposes and are not financial, tax or legal advice. See our disclaimer.