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Small Business Forecast Estimator

The Small Business Forecast Estimator projects future revenue from a current revenue base, an expected growth rate, and a selected number of periods. It gives owners a simple compounding model for planning when detailed customer, product, or seasonality data is not available.

The projection can support capacity planning, cash budgeting, target setting, and scenario comparisons. Because actual business results rarely grow at a perfectly constant rate, the estimate should be treated as a planning baseline rather than a guaranteed outcome.

Enter your assumptions

USD
%
periods
%
Result
—
Forecast final-period revenue
Total forecast revenue—
Final-period costs—
Final-period gross contribution—

1. Set the starting revenue
Enter revenue for the latest completed period.

2. Choose a growth assumption
Use the expected percentage change for each forecast period; negative values model contraction.

3. Enter the number of periods
Keep the period consistent, such as months or quarters, across all inputs.

4. Add an estimated cost rate
Enter the share of revenue expected to be consumed by variable and operating costs included in your planning model.

5. Review the projection
Use final-period revenue together with cumulative revenue and estimated contribution.

Formula:

Revenue in period n = Current revenue × (1 + Growth rate ÷ 100)^n Total forecast revenue = Sum of projected revenue for periods 1 through n Final-period contribution = Final-period revenue × (1 − Cost rate ÷ 100)

This model applies one constant compound growth rate and one constant cost rate to every forecast period.

What the result means

The main result is projected revenue in the last selected period after compounding the entered growth rate.

Seasonality, one-time events, capacity limits, and financing constraints are not modeled.

Given

Current monthly revenue of $50,000, monthly growth of 5%, a 12-month forecast, and a 65% cost rate.

Calculation

Month 12 revenue = $50,000 × 1.05^12 = $89,792.82 Month 12 costs = $89,792.82 × 65% = $58,365.33 Month 12 contribution = $89,792.82 − $58,365.33 = $31,427.49

Result

The final month is projected at about $89,792.82 in revenue under the constant-growth assumption.

What time period should I use?

Use the same interval for current revenue, growth, and forecast periods. Monthly inputs produce a monthly forecast; quarterly inputs produce a quarterly forecast.

Can the growth rate be negative?

Yes. A negative rate models declining revenue, but rates at or below −100% are not meaningful for repeated compounding.

Why is cumulative revenue higher than final-period revenue?

Cumulative revenue adds every projected period. Final-period revenue shows only the last period in the forecast horizon.

Should payroll be included in the cost rate?

Include payroll only if your planning definition of costs includes it. Use the same cost definition when comparing scenarios.

When should I use a more detailed forecast?

Use a driver-based forecast when seasonality, product mix, customer churn, inventory, or capacity materially affects results.