Common Feedlot Calculator Mistakes to Avoid
A feedlot calculator is only as honest as the numbers you type in. These are the mistakes that most often make projected profit look too good — or scare farmers away from a batch that would actually work.
What are the most common feedlot calculator mistakes?
Wrong starting or target weights, overstated average daily gain (ADG), stale feed or carcass prices, ignored mortality and wastage, and unrealistic dressing percentage are the usual errors. Always compare calculator output to your last closed batch. Run conservative figures in the feedlot calculator before buying weaners.
Using wrong starting or target weights
Buying weaners on average weight without weighing a sample leads to wrong gain calculations. Target weight should match what the abattoir or buyer actually wants — not what you hope for. A few kilograms on carcass weight changes income per animal across the whole batch.
Overstating average daily gain
Using your best-ever batch as the default plan is risky. Heat waves, pneumonia outbreaks and ration transitions knock growth back. Plan with a conservative average daily gain, then treat better performance as upside.
Ignoring feed intake and wastage
Daily intake as a percentage of body weight must match ration type. Wet feeds, silage and high-roughage diets are not planned with the same percentage as dry finishing pellets. Add wastage for trough spillage, sorting and weather — zero wastage is rare in open pens.
Stale feed or selling prices
Maize and concentrate prices on the quote sheet from last month are not today’s price. Carcass price assumptions should reflect current buyer grids, not a peak from six months ago. Run sensitivity scenarios when either input moves.
Forgetting mortality and other costs
Dead animals still consumed feed and purchase cost. A small mortality allowance changes profit per surviving animal. Vet medicine, transport, electricity for milling and pen cleaning belong in the plan somewhere — even if they are grouped as “other costs per animal.”
Dressing percentage and grade surprises
Dressing percentage links live weight to carcass weight. Heavy, over-fat animals may dress well but score poorly on grade. Under-conditioned animals dress lower. Use dressing percentages from your own abattoir returns where possible.
Wrong opening livestock value
For own weaners, opening value should be a realistic market value — what you could have sold them for — not zero. For purchased weaners, include commission and transport in the true landed cost per head.
How to sanity-check your plan
Compare calculator output to your last closed batch: total feed tons, days on feed and margin per head. If the plan diverges wildly without a clear reason, revisit inputs before you buy cattle.
Frequently asked questions
Why do feedlot profit estimates look too good on paper?
Overstated average daily gain, ignored feed wastage, zero mortality and peak carcass prices from months ago are the most common reasons projected margin is unrealistically high.
Should you use your best-ever batch as the default plan?
No. Plan with conservative average daily gain and realistic intake. Heat, disease and ration transitions knock growth back — treat better performance as upside.
What opening value should you use for your own weaners?
Use a realistic market value — what you could have sold them for — not zero. For purchased weaners, include commission and transport in landed cost per head.
How do you sanity-check a feedlot plan before buying cattle?
Compare calculator output to your last closed batch: total feed tons, days on feed and margin per head. If the plan diverges wildly, revisit inputs first.
These guides and calculators are planning tools only. Check results against your farm records, feed labels, supplier prices and professional advice from your nutritionist, veterinarian or financial adviser where needed.