Budgeting Calculators
Find the cash to clear your debt
Every debt payoff plan runs on your monthly surplus. These tools help you see exactly where your money goes and how much you can redirect toward becoming debt-free.
How do you work out your monthly surplus?
Your monthly surplus is your total monthly income minus every monthly cost, with weekly, quarterly and annual bills converted to a monthly average first. That one number sets the speed limit on any debt payoff plan — it is the amount you can put on top of your minimum payments each month.
The conversion step is where most budgets quietly go wrong. Treating a weekly cost as four weeks a month undercounts it by roughly 8% over a year, and annual bills left out altogether are the reason a budget balances on paper but not in your account. Multiply a weekly figure by 52.18 and divide by 12 — about 4.35 weeks a month. Bi-weekly costs use 26.09 payments a year. Divide quarterly bills by 3 and annual bills by 12.
The bills people most often miss are the once-a-year ones: auto insurance, registration and inspection, HVAC service, annual subscriptions, back-to-school costs and the holidays. Convert each to a monthly figure and treat it as a real cost, because it is one. The Budget Planner handles every conversion and shows the category breakdown, so you can see which areas have crept up.
A budgeting rule to start from
The best-known starting point is 50/30/20: half your take-home pay on needs, 30% on wants, and 20% split between savings and debt. Treat it as a diagnostic rather than a target — if your needs are eating 70%, that tells you the problem is fixed costs like rent, energy and insurance, not takeout. People actively clearing debt often run well above 20%, but only up to the point they can sustain.
That sustainability point matters more than the percentage. A $150 extra payment you keep up for two years clears far more than a $400 one you abandon in month three and then reverse with card spending. Set the figure you can hold on a bad month, not a good one, and automate it with autopay for the day after payday.
Pay priority bills before you overpay any debt
Priority debts come first, always. In the US these are property tax, rent or mortgage arrears, utility bills, court-ordered payments and money owed to the IRS — they carry enforcement powers that credit cards and personal loans do not.
Falling behind on a priority bill to overpay a credit card is a bad trade at any interest rate, because the consequences are not financial alone: they include liens, wage garnishment, and in the case of rent or mortgage arrears, losing your home. Bring priority bills up to date first, then work out your surplus, then start on unsecured debt with the debt snowball or debt avalanche.
If the budget shows no surplus at all — or your minimum payments already exceed what you can afford — free or low-cost help is the right next step, not a calculator. A nonprofit credit counseling agency through the NFCC can review your budget at no cost.
Frequently asked questions
How much of my income should go towards debt?
There is no single correct figure. The 50/30/20 rule points at 20% of take-home pay for savings and debt combined, but the number that matters is whatever surplus you can sustain every month without going back to the card when something breaks. A smaller payment you keep up beats a larger one you abandon in month three.
How do I convert weekly or annual bills to a monthly figure?
Multiply a weekly cost by 52.18 and divide by 12, which works out at about 4.35 weeks a month. Bi-weekly costs use 26.09 payments a year. Divide a quarterly bill by 3 and an annual bill by 12. Do not use four weeks for a month — that undercounts your spending by roughly 8% a year. The Budget Planner does every conversion for you.
Should I build an emergency fund before overpaying my debt?
A common approach is to set aside a small buffer of a few hundred dollars first, then start overpaying. Without a buffer, the first unexpected car repair or appliance failure goes straight back onto the credit card and undoes months of progress. Once the buffer is in place, the surplus goes to the debt.
What if my budget shows no surplus at all?
If there is nothing left after essentials, or your minimum payments already exceed what you can pay, a payoff calculator is not the right next step — free nonprofit credit counseling is. Agencies affiliated with the NFCC review your budget at no cost and can set up a Debt Management Plan that may lower your interest.