Cash Flow Forecast Calculator
Project monthly cash inflows, outflows, and ending balances over a customizable forecast period.
What This Calculator Does
This calculator projects monthly cash inflows, outflows, and running balance over a customizable period. It models revenue growth, fixed and variable expenses, and identifies potential cash shortfalls before they occur, giving business owners time to arrange financing or adjust spending.
The Formula
Cash flow forecasting tracks the timing of money moving in and out of your business. Starting from an opening balance, each month adds revenue (with optional growth) and subtracts fixed costs and variable costs (as a percentage of revenue). The running balance reveals cash position trends.
Step-by-Step Example
Enter opening cash balance
Your current cash position. Example: $50,000 in the bank.
Set monthly revenue and growth
Current monthly revenue ($25,000) and expected monthly growth rate (2%).
Enter expense structure
Fixed monthly expenses ($15,000) and variable expenses as a percentage of revenue (30%).
Review the forecast
See month-by-month projections of inflows, outflows, net cash flow, and running balance.
Real-World Use Cases
Cash Runway Planning
Determine how many months your business can operate before needing additional funding.
Seasonal Business Planning
Identify months where cash flow dips and arrange credit lines or reserves in advance.
Growth Scenario Modeling
Test different growth and expense scenarios to find sustainable expansion strategies.
Common Mistakes to Avoid
Confusing revenue with cash received. If customers pay on 30-60 day terms, cash arrives later than the sale date.
Ignoring one-time expenses like equipment purchases, tax payments, or annual insurance premiums that create temporary cash crunches.
Using overly optimistic growth assumptions. Revenue growth requires investment in sales and marketing that increases expenses too.
Not updating the forecast regularly. A forecast is only useful if refreshed monthly with actual results.
Frequently Asked Questions
Accuracy and Disclaimer
Cash flow forecasts are projections based on assumptions. Actual results will differ due to timing variations, unexpected expenses, customer payment delays, and market conditions. Update forecasts regularly with actual data.
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