Budget Calculator: Plan Your Monthly Budget

A budget runs on simple arithmetic. Add up everything you spend in a month, subtract it from your take-home income, and the result — positive or negative — tells you whether your plan works.

• Total expenses: the sum of every category you enter, including savings. Paying yourself first is still money leaving the spending pool.
• Leftover: monthly income − total expenses. A positive number is a surplus you can save or redirect; a negative number is a shortfall to fix.
• Category share: category amount ÷ monthly income × 100, so each expense shows up as a slice of your pay.
• Savings rate: monthly savings ÷ monthly income × 100. This is the number financial planners watch most closely.

Sources: Consumer Financial Protection Bureau — budgeting guidance; Federal Trade Commission (consumer.gov) — budget worksheet.

Take a monthly take-home income of $5,000. Suppose the expenses are: housing $1,200, food $500, transportation $300, utilities $200, insurance $150, healthcare $200, debt payments $300, entertainment $200, and other expenses $150 — a total of $3,200 — plus $500 of planned savings. Total allocated is $3,700, so the leftover is $5,000 − $3,700 = $1,300. The savings rate is $500 ÷ $5,000 × 100 = 10%.

Grouped for the 50/30/20 check: needs are housing, transportation, food, utilities, insurance, healthcare and debt payments — $2,850, or 57% of income. Wants are entertainment and other — $350, or 7%. Savings are $500, or 10%. That is $150 above the 50% needs target, with $1,300 still unallocated — a healthy position with room to raise savings.

Use your take-home pay — the amount that actually lands in your account after taxes and deductions — not your gross salary. Then work through each expense group with your best estimate of a typical month.

Step by step

1. Enter your monthly take-home income. If your pay varies, use a conservative average of the last three months.
2. Fill in each expense category. Leave any category at zero if it does not apply to you.
3. Enter your planned monthly savings. Treat it as a fixed bill to yourself, not as whatever happens to be left.
4. Press Calculate. Read your leftover, savings rate, the per-category breakdown and the 50/30/20 comparison underneath.

The 50/30/20 rule, popularized by Senator Elizabeth Warren in the book All Your Worth, is a starting framework: about 50% of after-tax income for needs, 30% for wants, and 20% for savings and extra debt payments. It is a guideline, not a law — households in expensive cities often spend more than 50% on needs, and that is fine as long as the overall math still balances.

If the 20% savings slice looks out of reach today, start smaller: a savings goal calculator turns an abstract percentage into a concrete monthly amount for a specific target, which is far easier to commit to.

Most budgets fail in the same few places. Small recurring charges are the classic leak: subscriptions, delivery fees and ride-shares that each feel trivial but quietly add up to hundreds a month. The second is irregular bills — car insurance paid twice a year, holiday spending, annual memberships — that ambush a month planned only for regular expenses.

The Consumer Financial Protection Bureau publishes free budgeting worksheets and a spending tracker that pair well with this calculator when you want to compare your actual spending against the plan.

A budget you never look at is just a wish. Review yours once a month, move the savings transfer to payday so it happens automatically, and give every leftover dollar a job before the month starts rather than after it ends.

• Automate savings. A transfer that happens on payday cannot be spent first.
• Review monthly, not daily. One calm review beats constant worrying.
• Trial every cut for one month. Cancel, cook, or carpool for 30 days and keep only the cuts you did not miss.
• Keep a small buffer. Budget $50–$100 as miscellaneous so surprises do not break the plan.

Once the monthly budget balances, the next question is what the surplus should do. A retirement calculator shows how even modest monthly savings compound into serious money over decades.