Feed mill planning tool
Feed Mill Bottleneck Calculator
Enter the rated capacity of intake, grinding, mixing, pelleting, cooling and packing. See which stage limits real plant throughput, the tonnes per hour you actually get, and what to debottleneck first.
How do you find the bottleneck in a feed mill?
A feed mill can only produce at the rate of its slowest stage. Compare the effective capacity of intake, grinding, mixing, pelleting, cooling and packing in tonnes per hour — after applying availability, not nameplate — and the lowest number is the plant's real throughput. Every other stage above that figure is spare capacity you have already paid for. Debottlenecking means raising only the limiting stage, then re-checking, because the constraint usually moves to the next-lowest stage rather than disappearing.
Reviewed August 2026. Planning estimate — not a quotation.
Run the numbers
Result
- Bottleneck stage
- Pelleting
- Real plant throughput
- 13.6 t/h
- Daily output
- 218 t/day
- Annual output
- 65,280 t/year
- Next constraint
- Grinding at 15.3 t/h
- Gain from debottlenecking this stage only
- 12.5%
13.6 t/h effective
vs 16.0 t/h rated
Worth isolating in a retrofit scope.
Stage-by-stage capacity
| Stage | Effective t/h | Idle capacity |
|---|---|---|
| Pelleting | 13.6 t/h | — limiting |
| Grinding | 15.3 t/h | +1.7 t/h spare |
| Cooling | 17.0 t/h | +3.4 t/h spare |
| Mixing (effective) | 18.7 t/h | +5.1 t/h spare |
| Packing / loadout | 21.3 t/h | +7.7 t/h spare |
| Intake / pre-cleaning | 34.0 t/h | +20.4 t/h spare |
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
- Applies your availability assumption to each stage's rated capacity to get effective tonnes per hour.
- Identifies the limiting stage and the real plant throughput that follows from it.
- Shows how much idle capacity sits in every non-limiting stage.
- Calculates the throughput you would reach if the current bottleneck were raised to the next constraint.
- Converts the result into daily and annual tonnage at your operating schedule.
What it cannot do
- It cannot detect surge-bin and buffer effects, which can partly absorb a short-duration constraint.
- It cannot model recipe-dependent capacity — a fine-ground aquafeed grind rate differs sharply from a coarse cattle grind.
- It cannot replace a physical capacity audit with logged production data.
- It does not price the debottlenecking work.
Who this is for
- Feed mill owners whose plant never reaches the tonnage the supplier quoted
- Production managers deciding where the next capital spend actually pays back
- Integrators and consultants auditing an existing plant before an expansion
- Buyers evaluating a retrofit proposal that upgrades only one machine
Input definitions
- Intake / pre-cleaning rated capacity (t/h)
- Entered by you. Default used for the worked example: 40 t/h.
- Grinding rated capacity (t/h)
- Entered by you. Default used for the worked example: 18 t/h.
- Mixing effective capacity (t/h)
- Batch size ÷ full cycle time (fill + mix + discharge).
- Pelleting rated capacity (t/h)
- Enter 0 if the plant produces mash only.
- Cooling rated capacity (t/h)
- Entered by you. Default used for the worked example: 20 t/h.
- Packing / bulk loadout rated capacity (t/h)
- Entered by you. Default used for the worked example: 25 t/h.
- Availability (%)
- Share of scheduled hours the line genuinely runs. 80–90% is typical for a well-run mill.
- Operating hours per day (h)
- Entered by you. Default used for the worked example: 16 h.
- Operating days per year (d)
- Entered by you. Default used for the worked example: 300 d.
Methodology
Effective capacity per stage = rated tonnes per hour × availability. Plant throughput = the minimum effective capacity across all stages. Idle capacity per stage = that stage's effective capacity minus plant throughput. The debottleneck target is the second-lowest effective capacity, because raising the limiting stage above that point yields nothing until the next stage is also raised.
Assumptions
- Availability is applied uniformly to every stage. In practice pelleting availability is usually lower than mixing availability because of die changes.
- The line is treated as a series process with no significant intermediate buffering.
- Mixing capacity is entered as an effective figure — batch size divided by full cycle time including fill and discharge, not mixing time alone.
- Rated capacities are assumed to be at your actual formula and moisture, not at the supplier's reference product.
Worked example — a 20 t/h plant that produces 13 t/h
Inputs
- Intake 40 t/h, grinding 18 t/h, mixing 22 t/h, pelleting 16 t/h, cooling 20 t/h, packing 25 t/h
- Availability 85 percent, 16 hours per day, 300 days per year
Outputs
- Limiting stage: pelleting at 13.6 t/h effective
- Plant throughput 13.6 t/h — not the 20 t/h nameplate
- Debottleneck target 15.3 t/h, set by grinding
- Annual output about 65,300 tonnes
How to read it. Adding a second pellet line looks attractive until you notice grinding sits only 1.7 t/h above pelleting. Raising pelleting alone moves the constraint to the hammer mill after a gain of roughly 12 percent, so a credible proposal has to price both.
Limitations
- Results are a planning indication for discussion with suppliers, not a performance guarantee.
- Two mills with identical stage ratings can differ by 15 percent or more in real output because of formula, operator practice and maintenance discipline.
- Cooling constraints often show up as a quality problem — high moisture or hot pellets — before they show up as a tonnage problem.
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.
Frequently asked questions
Why does a feed mill rarely run at nameplate capacity?
Which stage is usually the bottleneck in a feed mill?
Should I raise capacity at the bottleneck or replace the whole line?
How does a bottleneck change cost per tonne?
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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.