Cash Flow Projection Calculator
Forecast your monthly cash flow at any future point using revenue growth, fixed expenses, and variable cost rates. Ideal for budgeting, loan applications, and strategic planning.
About this calculator
Cash flow projection estimates how much cash a business will have available at a specific point in the future, after accounting for growth in revenue and ongoing expenses. The projection compounds monthly revenue growth over the selected period using the formula: Projected Cash Flow = Current Revenue × (1 + Growth Rate)^Months × (1 − Variable Expense Rate) − Fixed Expenses. The term (1 + Growth Rate)^Months is an exponential growth factor, meaning small monthly growth rates compound significantly over longer horizons. Variable expenses scale as a percentage of projected revenue, while fixed expenses remain constant regardless of revenue level. The result is the estimated net cash flow for the final month in the projection period, not a cumulative total. This model assumes steady growth and expense ratios, so it works best as a baseline scenario alongside optimistic and pessimistic variants.
How to use
Suppose current monthly revenue = $10,000, monthly growth rate = 2%, fixed expenses = $3,000/month, variable expenses = 30% of revenue, and projection period = 6 months. Step 1 — Apply growth: $10,000 × (1 + 0.02)^6 = $10,000 × 1.1262 = $11,262. Step 2 — Subtract variable expenses: $11,262 × (1 − 0.30) = $11,262 × 0.70 = $7,883. Step 3 — Subtract fixed expenses: $7,883 − $3,000 = $4,883. Projected net cash flow in month 6 is approximately $4,883, compared to $4,000 today — reflecting the benefit of sustained revenue growth.
Frequently asked questions
How accurate is a cash flow projection calculator for a new business?
Cash flow projections are inherently estimates and become less accurate the further into the future you project. For new businesses with no historical data, growth and expense assumptions are especially uncertain and should be treated as scenarios rather than predictions. It is best practice to run at least three versions — conservative, base, and optimistic — to understand the range of outcomes. Revisiting and updating your projection monthly as actual data comes in significantly improves its reliability.
What is the difference between cash flow projection and profit and loss forecasting?
A profit and loss forecast measures accounting profit, which includes non-cash items like depreciation and accrued income. Cash flow projection focuses strictly on actual cash moving in and out of the business during a period. A company can be profitable on paper while experiencing negative cash flow if customers are slow to pay or large capital expenditures are made. For day-to-day operations and loan servicing, cash flow is often the more critical figure to monitor.
Why does compounding matter so much in long-term cash flow projections?
Compounding means that growth in one month becomes the base for the next month's growth, so small percentage increases accumulate faster than intuition suggests. A 2% monthly growth rate produces roughly 27% growth over 12 months, not 24%. Over a 24-month period, the same rate results in about 61% revenue growth. This is why projections made with linear assumptions — simply multiplying monthly growth by the number of months — consistently underestimate future revenue and can lead to poor planning decisions.