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Monthly Cash Flow Calculator

Estimate your monthly cash flow by comparing your income, fixed expenses, variable spending, and debt payments.

Your Details

Overview

A monthly cash flow calculator helps you compare your monthly income with your regular outflows so you can see whether you are running a surplus or a shortfall. Enter your take-home income along with fixed expenses, variable spending, debt payments, and other outflows to get a simple monthly picture.

How it works

The calculator adds together your monthly outflows, including fixed expenses, variable expenses, debt payments, and other outflows. It then subtracts that total from your monthly income to estimate your net cash flow. It also shows what percentage of your income is being used by monthly outflows and, if you have a surplus, what percentage remains available.

How to use this calculator

  1. 1Enter your total monthly take-home income.
  2. 2Add your fixed monthly expenses such as housing and insurance.
  3. 3Include your variable monthly spending such as groceries and transport.
  4. 4Enter your monthly debt payments and any other outflows.
  5. 5Review your net cash flow, total outflows, and expense ratio.

Example Calculation

Monthly Income

$5,000

Fixed Expenses

$1,800

Variable Expenses

$1,200

Debt Payments

$400

Other Outflows

$200

Net Monthly Cash Flow

$1,400

With monthly income of $5,000 and total outflows of $3,600, the estimated net monthly cash flow is $1,400. That means about 72.0% of income is being used for monthly outflows.

Frequently asked questions

What does this monthly cash flow calculator estimate?

It estimates your monthly surplus or shortfall by subtracting your total monthly outflows from your monthly income.

Should I use gross income or take-home income?

For personal budgeting, take-home income is usually more useful because it reflects what is actually available to spend each month.

What counts as fixed expenses?

Fixed expenses are regular costs that usually stay similar each month, such as rent, mortgage payments, insurance, subscriptions, and some utility bills.

What counts as variable expenses?

Variable expenses are costs that can change from month to month, such as groceries, fuel, eating out, clothing, and entertainment.

Are savings treated as an expense here?

They can be included under other outflows if you want to treat regular savings transfers as part of your monthly cash commitments.

What if my income changes every month?

You can use an average monthly income based on recent months, but the result will still be an estimate rather than an exact forecast.

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Assumptions and warnings

Assumptions

  • All amounts are monthly figures entered in the same currency.
  • Income and expenses are treated as regular monthly amounts.
  • The calculator does not account for seasonal income, one-off expenses, or changes during the month.
  • Results are estimates intended to support budgeting and cash flow planning.

Warnings

  • This calculator provides an estimate only and is not financial advice.
  • Review your actual statements and bills before making major budgeting or borrowing decisions.