How do you calculate the demand forecast gap?

Subtract forecast demand from available supply to get the supply gap, then divide by the reference forecast demand. With 18,500 kg available against 22,000 kg forecast (reference 22,000 kg), the supply gap is -3,500 kg and the demand forecast gap is -15.9%.

What does a negative demand forecast gap mean?

A negative gap means supply is below forecast demand. The -15.9% result here signals a 3,500 kg enzyme shortfall that must be closed by an extra campaign, drawing safety stock, or reallocating across customers before the period.

What is a good demand forecast gap for industrial enzymes?

A gap within roughly +/-5% is generally healthy given fermentation titer noise. Beyond -10% you are exposed to stockouts and air-freight expedites; beyond +15% you risk holding enzyme past its activity-stability window.

Why use a separate reference forecast demand instead of the period demand?

Decoupling the denominator lets you normalize against a stable annualized or contracted baseline rather than a volatile single-period number, so gaps stay comparable across months even when the period forecast itself shifts.

Demand forecast gap vs forecast accuracy: what is the difference?

Forecast accuracy compares forecast to actuals after the fact. The demand forecast gap is forward-looking, comparing what you can supply against what you forecast you will need, so you can act before the shortfall materializes.

How do I close a negative enzyme supply gap?

Options include scheduling an additional fermentation campaign, increasing titer through media optimization, pulling forward safety stock, blending in higher-activity lots to hit total enzyme units, or rationing allocation across lower-priority accounts.

Industrial Enzymes & Bio-Ingredients calculator

Demand Forecast Gap Calculator

The demand forecast gap measures how far your available enzyme or bio-ingredient supply sits above or below forecast demand for the same period, expressed as a percentage of a reference demand baseline. Supply chain planners and fermentation production schedulers in industrial enzyme plants use it to flag whether a brewing campaign, an alpha-amylase batch, or a protease lot will leave customers short or sitting on slow-moving inventory with a finite shelf life. Because enzyme titers swing batch to batch and fermentation lead times run weeks, even a single-digit gap can mean a missed delivery window or a costly emergency campaign. A negative gap is a deficit you must close; a positive gap is excess capacity or inventory to redeploy.

What this calculator does

Calculate the gap between available enzyme or bio-ingredient supply and forecast demand on a consistent product basis.
Use it when comparing planned production, inventory, or supplier commitments with forecast demand for a product, customer, or campaign.
It computes the percentage by which available enzyme supply exceeds or falls short of forecast demand, normalized against a reference demand figure.

Formula used

Demand forecast supply gap = available supply for forecast period - forecast demand for same period
Demand forecast gap = supply gap ÷ reference forecast demand

Inputs explained

Available enzyme supply for forecast period:
Forecast enzyme demand for same period:
Reference forecast demand baseline:

How to use the result

Use it during S&OP review, before committing a fermentation campaign, or when reconciling a customer order book against finished-goods stock and in-process titer yields.
It treats supply and demand as point estimates for one period and ignores titer variability, shelf-life decay, and the timing of when supply actually becomes available within the window.

Current U.S. benchmarks

Industrial natural gas averages $4.9 per Mcf (EIA, Apr 2026), down 7.7% from a year earlier, with industrial electricity at 8.66 cents per kWh. Process heating and refrigeration budgets track both.

Common questions

How do you calculate the demand forecast gap? Subtract forecast demand from available supply to get the supply gap, then divide by the reference forecast demand. With 18,500 kg available against 22,000 kg forecast (reference 22,000 kg), the supply gap is -3,500 kg and the demand forecast gap is -15.9%.
What does a negative demand forecast gap mean? A negative gap means supply is below forecast demand. The -15.9% result here signals a 3,500 kg enzyme shortfall that must be closed by an extra campaign, drawing safety stock, or reallocating across customers before the period.
What is a good demand forecast gap for industrial enzymes? A gap within roughly +/-5% is generally healthy given fermentation titer noise. Beyond -10% you are exposed to stockouts and air-freight expedites; beyond +15% you risk holding enzyme past its activity-stability window.
Why use a separate reference forecast demand instead of the period demand? Decoupling the denominator lets you normalize against a stable annualized or contracted baseline rather than a volatile single-period number, so gaps stay comparable across months even when the period forecast itself shifts.
Demand forecast gap vs forecast accuracy: what is the difference? Forecast accuracy compares forecast to actuals after the fact. The demand forecast gap is forward-looking, comparing what you can supply against what you forecast you will need, so you can act before the shortfall materializes.

Last reviewed 2026-05-12.