Demand Forecast Calculator
Project unit demand forward with growth compounding and cumulative totals for capacity planning.
Free · No signup · By the analysts at Blackridge Research · Updated 2026-07-18
Inputs
Results
What this means
Adjust the inputs to calculate.
About the Demand Forecast Calculator
A demand forecast projects unit demand forward with growth compounding and cumulative totals for capacity planning.
Unlike a revenue forecast, it deals in natural units — tonnes, barrels, units, projects, or customers.
Formula
Demandₜ = Demand₀ × (1 + g)^n | Cumulative = Σ Demandᵢ
- D₀
- — Current Demand — starting demand in natural units
- g
- — Growth Rate — annual growth rate as decimal
- n
- — Years — number of years to project forward
How to use this calculator
- 1
Enter current annual demand
Input current demand in natural units.
- 2
Enter growth rate
Input a growth rate grounded in drivers.
- 3
Enter the horizon
Input the number of years to project forward.
- 4
Review the results
See the projected demand, cumulative total, and largest annual increment.
Example calculations
Cement demand for an infrastructure program
A region consumes 84,000 tonnes of cement annually; a national infrastructure program is expected to drive 6% annual growth for seven years.
Year 7 demand = 84,000 × 1.06^7 = 126,300 t. Cumulative = 705,000 t.
- Demand in final year:
- 126,305
- Cumulative demand over horizon:
- 747,387
- Largest absolute increase:
- 7,149
The forecast's job is to date the capacity decision, not just size the endpoint.
Interpreting your results
A demand forecast is a conditional statement: 'if' the drivers behave as assumed.
Watch the largest annual increment: supply chains that handle the endpoint comfortably still fail in the steepest year.
Need the market data behind this calculator?
The Demand Forecast Calculator is only as good as its inputs. Blackridge Research publishes syndicated market reports with vetted market sizes, growth rates, and competitive landscapes across 40+ industries — and builds custom studies when the shelf report doesn't exist.
Industry applications
Business
- Capacity planning: size production, logistics, and sourcing needs.
- Supply chain management: plan procurement and inventory levels.
- Investment decisions: date when new capacity must come online.
Construction
- Material suppliers: forecast demand for cement, steel, and other construction materials.
- Equipment lessors: size fleet requirements against projected project activity.
Research
- Market reports: demand forecasts underpin supply-side market sizes.
- Feasibility studies: project demand for new facilities or capacity.
Common mistakes to avoid
-
✗ Ignoring capacity constraints
A demand forecast that exceeds current capacity should trigger investment decisions.
-
✗ Constant rate forever
No market compounds at the same rate indefinitely.
Frequently asked questions
›What is the difference between demand forecast and revenue forecast?
Demand forecast deals in natural units; revenue forecast deals in dollars.
›How do I handle seasonality?
Start with the constant-rate forecast, then layer seasonal factors.
Glossary
- Demand forecast:
- Projection of unit demand forward with growth compounding.
- Cumulative demand:
- Total demand over the entire forecast horizon.
- Largest annual increment:
- The single-year increase in demand — the stress case for supply chains.
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