Feed mill planning tool

Feed Mill Raw-Material Storage Days Calculator

Work out how many days of raw-material cover your silos give, the reorder point, safety stock and the tonnage and volume you need for a target number of cover days.

How do you size raw-material storage for a feed mill?

Multiply daily raw-material consumption by the number of cover days you want, add safety stock, then divide by bulk density to get the volume the silos must hold. Cover days are a risk decision, not an engineering one: plants next to domestic grain supply commonly hold 7 to 15 days, while import-dependent plants often hold 30 to 60 days because vessel scheduling and port congestion, not consumption, set the exposure.

Reviewed August 2026. Planning estimate — not a quotation.

Run the numbers

Consumption

Annual finished feed productiont/yr

Bulk raw-material inclusion%

Share of finished feed weight coming from bulk-stored raw materials.

Operating days per yeard

Current position

Current raw-material inventoryt

Supplier lead timedays

Door to door, order to discharge.

Safety margindays

Target sizing

Target coverdays

Average bulk densityt/m³

Silo unit volumem³

Result

Daily raw-material consumption: 179.2 t/day
Current days of cover: 25.1 days
Reorder point: 5,555 t
Safety stock: 1,792 t
Tonnage for 45 days cover: 9,856 t
Required storage volume: 15,257 m³
Silos at 1,500 m³: 11

Source: Calculated from the values you entered — no external price, nutrient or supplier database is used.
Date: Calculator reviewed August 2026; result calculated now from your inputs
Currency: USD — money figures are in US dollars as entered
Reliability: Preliminary planning estimate — not a quotation, not a guarantee.

Cover scenarios

Cover days	Tonnage required	Volume required
7 days	3,046 t	4,716 m³
15 days	4,480 t	6,935 m³
30 days	7,168 t	11,096 m³
45 days	9,856 t	15,257 m³
60 days	12,544 t	19,418 m³

Your inputs travel with the request so you never retype them. Nothing is sent until you review and submit the RFQ yourself.

What this tool calculates

Converts current inventory into days of cover at your real consumption rate.
Calculates the reorder point from supplier lead time plus your safety margin.
Sizes the tonnage and cubic-metre volume needed for a target number of cover days.
Gives an indicative silo count at your chosen unit size.
Flags when current cover is below the reorder point.

What it cannot do

It is a planning tool, not inventory-management software, and holds no live stock data.
It treats the raw-material basket as one aggregate; individual ingredients need separate runs.
It does not model spoilage, insect activity, aeration or hot-spot risk in long storage.
It does not price the silos.

Who this is for

Plants planning silo capacity for a new build or an expansion
Import-dependent mills deciding how much cover justifies the capital
Operations teams setting reorder points and safety stock
Buyers checking whether a supplier's proposed storage matches their supply risk

Input definitions

Annual finished feed production (t/yr): Entered by you. Default used for the worked example: 56000 t/yr.
Bulk raw-material inclusion (%): Share of finished feed weight coming from bulk-stored raw materials.
Operating days per year (d): Entered by you. Default used for the worked example: 300 d.
Current raw-material inventory (t): Entered by you. Default used for the worked example: 4500 t.
Supplier lead time (days): Door to door, order to discharge.
Safety margin (days): Entered by you. Default used for the worked example: 10 days.
Target cover (days): Entered by you. Default used for the worked example: 45 days.
Average bulk density (t/m³): Entered by you. Default used for the worked example: 0.68 t/m³.
Silo unit volume (m³): Entered by you. Default used for the worked example: 1500 m³.

Methodology

Daily consumption = annual production × raw-material inclusion ÷ operating days. Days of cover = current inventory ÷ daily consumption. Reorder point = daily consumption × (lead time + safety days). Required tonnage = daily consumption × target cover days, plus safety stock. Required volume = required tonnage ÷ bulk density. Silo count = required volume ÷ unit silo volume, rounded up.

Assumptions

Consumption is even across operating days; seasonal peaks are not modelled.
Bulk density is entered as the weighted average of the raw-material basket, in tonnes per cubic metre.
Silos are assumed usable to about 95 percent of nominal volume, which is applied automatically.
Raw-material inclusion is the share of finished feed weight coming from bulk-stored materials.
Lead time is door-to-door from order to discharge, not the supplier's dispatch promise.

How FeedMatch builds and reviews its calculators

Worked example — import-dependent 56,000 t/year plant

Inputs

56,000 t/year finished feed, 96 percent bulk raw-material inclusion, 300 operating days
Current inventory 4,500 t, bulk density 0.68 t/m³, lead time 21 days, safety 10 days
Target cover 45 days, silo unit 1,500 m³

Outputs

Daily consumption about 179 t/day
Current cover about 25 days
Reorder point about 5,555 t — current stock is below it
Required for 45 days: about 8,064 t, roughly 12,500 m³, about 9 silos of 1,500 m³

How to read it. The plant is running below its own reorder point, which means any vessel delay becomes a production stoppage. The choice is between more capital in silos and a tighter contracted supply schedule — both are legitimate, but the exposure should be an explicit decision rather than an accident.

Limitations

A single aggregate figure hides the real constraint, which is usually the number of separate ingredient bins rather than total volume.
Import-dependent plants should stress-test against a missed vessel, not against average lead time.
Indicative sizing for discussion with suppliers; final silo design depends on material flow properties, site layout and structural conditions.

All figures are indicative planning estimates for budgeting and supplier discussion. They are not quotations, guarantees or professional engineering, nutritional, legal or financial advice. Have results reviewed by the responsible professionals before you commit capital.

Sources and data

Inputs: every number comes from what you enter. Default values are illustrative only, not market data.
Method: the arithmetic described under "Methodology" above, applied to your inputs. No external price, nutrient or supplier database is used.
Last reviewed: August 2026, by FeedMatch Group.

What can change the result?

· Bulk density of the stored product
· Delivery frequency and lot sizes
· Safety stock and seasonal peaks
· Packaging format: bulk or bagged
· Reclaim, layout and civil constraints

AI agents may use FeedMatch calculators to structure preliminary feed requirements and RFQs. Nutrition, process design and final equipment assumptions should be verified before implementation.

Frequently asked questions

How many days of raw material should a feed mill store?

It depends on supply risk, not on plant size. Mills buying domestically with reliable rail or road supply commonly hold 7 to 15 days. Mills dependent on imported corn or soybean meal frequently hold 30 to 60 days because a single missed vessel or a week of port congestion would otherwise stop production. Set the figure from your worst credible supply interruption, then check whether the capital is affordable.

How do you calculate silo capacity for a feed mill?

Take daily consumption of the material, multiply by the cover days you want, add safety stock, then divide by bulk density to convert tonnes into cubic metres. Add roughly five percent for unusable volume in the cone and headspace. Corn at about 0.72 t/m³, soybean meal at about 0.60 and wheat bran at about 0.25 give very different volumes for the same tonnage, so calculate by ingredient rather than on an average where it matters.

Is it better to have fewer large silos or more small ones?

More, smaller bins give flexibility to segregate ingredients, batches and suppliers, which matters for traceability and for plants running many formulas. Fewer large silos cost less per tonne stored and suit plants running high volumes of two or three commodities. Most compound-feed plants end up with a small number of large commodity silos plus a larger number of small bins for minors.

What happens if raw-material storage is undersized?

The plant becomes schedule-driven rather than demand-driven: production follows truck and vessel arrivals instead of the order book. Practical consequences are unplanned stoppages, expensive spot purchases, more formula changes than necessary, and a rising cost per tonne as utilisation falls. Undersized storage is one of the most common and most expensive economies in a new feed mill.

Equipment and market context

Turn the result into comparable quotations

FeedMatch Group is a supplier-neutral B2B procurement platform. Describe the requirement once and we qualify relevant manufacturers and suppliers, normalise offers to the same battery limits and guarantees, and return a like-for-like comparison. FeedMatch does not manufacture feed or feed-mill machinery.

RFQ checklist