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Enter the pig body weight in kilograms, pick the growth stage, and enter the group size and the number of feeding days. The calculator returns daily feed per pig, daily feed for the group, total feed for the period, and how many 50 kg sacks that means. Stage rates are planning values inside the published ranges: growing pigs eat about 4 to 6 percent of body weight a day, with lighter pigs near the top of the range and finishers near the bottom. These are estimates for healthy pigs, not veterinary advice, and breed, ration energy, housing and weather all move the real figure.
Pig feed intake is usually quoted two ways: as a percentage of body weight, and as kilograms per day at a given weight. The two agree closely. Growing pigs eat about 4 to 6 percent of body weight per day, with lighter feeder pigs near 6 percent and finishers near market weight near 4 to 4.5 percent. This calculator uses 5 percent for weaners, 4 percent for growers, and 3.2 percent for finishers.
Worked example: a 50 kg grower eats 2.00 kg a day, so a group of 10 eats 20 kg a day, 600 kg over 30 days, or 12 sacks of 50 kg. A second example: a 90 kg finisher eats 2.88 kg a day, so a group of 5 eats 14.40 kg a day, 432 kg over 30 days, or 8.64 sacks. Add a 5 to 10 percent buffer for waste or weather interruptions when you actually order, because spilled and spoiled feed never reaches the pig. This pig feed consumption calculator covers all pig feed stages, and this pig feeding guide uses weaner, grower and finisher rates; for swine in general, the same percentages apply to growing pigs of any breed.
Published stage charts agree on the shape of intake: it rises steeply with weight, then levels off as a percentage. A widely used commercial chart runs from 0.3 to 0.5 kg a day for 8 to 15 kg pre-starters, 0.6 to 1.0 kg for 15 to 25 kg starters, 1.2 to 1.6 kg for 25 to 40 kg growers, 1.8 to 2.2 kg for 40 to 60 kg growers, 2.4 to 2.8 kg for 60 to 80 kg finishers, and 2.8 to 3.2 kg for 80 to 100 kg finishers, with 216 to 281 kg of total feed from 8 kg to 100 kg market weight over about 124 to 156 days.
Age-based charts tell the same story in weeks: about 0.35 kg a day at 4 weeks and 7 kg, 1.0 kg at 8 weeks and 21 kg, 1.4 kg at 12 weeks and 40 kg, 1.9 kg at 16 weeks and 65 kg, and 2.4 kg at 20 weeks and 95 kg. If your pigs eat far outside these bands, check ration energy, feeder space, water flow and health before assuming the chart is wrong.
Weaners, roughly 5 to 8 weeks old and 20 to 40 lb, get a starter ration at 18 to 20 percent protein and eat about 1 lb a day, gaining about 0.9 lb a day. Growers, roughly 40 to 125 lb, get a 16 percent protein ration based on cereals plus a protein supplement such as soybean meal, eat about 4 to 5 lb a day, and gain about 1.5 lb a day. Finishers, roughly 125 to 240 lb, get a 13 to 14 percent protein ration, eat about 7 lb a day, and gain about 1.8 lb a day.
Split feeding phases rather than feeding one ration all the way through: feeding a grower ration to about 125 to 150 lb and then switching to a finisher ration usually improves efficiency. Protein percentage falls as pigs grow because lean growth slows relative to fat deposition, while total daily intake keeps rising. Sows are a separate case: gestating sows hold near 2 to 2.5 kg a day, while lactating sows jump to 4 to 7 kg a day depending on litter size and milk demand.
Feed conversion ratio, or FCR, is kilograms of feed per kilogram of gain. Efficient grow-finish pigs often land between 2.5 and 3.5, and if FCR creeps above 3.6 with good health and housing, check ration energy and feeder management for waste. Complete rations usually give the best FCR, so they can cost less per kilogram of gain even when the bag price is higher, while home-mixed or scrap-heavy diets can slow gain and raise FCR enough to erase a cheaper bag price.
Use the sack figure from this calculator as your ordering base, then add the waste buffer and check bag price against expected gain. A homestead example from competitor guides: grower pigs at 100 lb eating about 5 lb a day for 90 days need about 900 lb for 2 pigs, or 18 bags, and at 2 lb a day gain they finish near 280 lb. Weigh pigs regularly: if gain stalls, adjust feed upward only after checking water, health and feeder access.
Water limits feed intake within hours, so it is the first thing to check when pigs under-eat. Pigs need roughly 2 to 3 litres of water per kilogram of dry feed, which means a finisher eating 3 kg a day needs roughly 7 to 12 litres, and drinker flow should stay above about 1.5 litres per minute. A single drinker for a pen of 8 or more pigs, or algae in nipple drinkers, are common failures.
Plan about 8 to 10 square feet of covered shelter per growing pig and free-choice clean water at all times, with good drainage outdoors so feed is not wasted into mud, which hurts FCR. In cold weather pigs eat more to stay warm, and outdoor pigs show a stronger seasonal swing than indoor pigs. Keep feed fresh by replacing it at least twice daily in trough systems, and never let mouldy or spoiled feed stay in the trough.
Most growing pigs eat 4 to 6 percent of body weight per day. Lighter feeder pigs sit near 6 percent, while finishers near market weight sit near 4 to 4.5 percent. A 50 kg grower eats about 2 kg a day, and a 90 kg finisher about 2.88 kg a day in this calculator.
Multiply daily feed per pig by the number of pigs and by the feeding days, then divide by 50 for 50 kg sacks. Add a 5 to 10 percent buffer for waste or weather interruptions. This calculator does all of those steps for you.
Efficient grow-finish pigs often land between 2.5 and 3.5 kg of feed per kg of gain. If FCR creeps above 3.6 with good health and housing, check ration energy and feeder management for waste.
Yes. Feeding a grower ration to about 125 to 150 lb and switching to a finisher ration afterward usually improves efficiency, because protein needs fall as pigs grow while total intake keeps rising.
From 50 lb to 250 to 280 lb, typical homestead pigs need 90 to 140 days depending on genetics, ration energy, weather and health. Faster growth near 2.2 to 2.5 lb a day finishes closer to 100 days, while heat stress or low-energy feed can extend finishing to four or five months.
Roughly 2 to 3 litres of water per kilogram of dry feed, so a finisher eating 3 kg a day needs about 7 to 12 litres. Restricted water cuts feed intake within hours, so keep drinker flow above about 1.5 litres per minute.
Gestating sows hold steady near 2 to 2.5 kg a day, while lactating sows jump to 4 to 7 kg a day depending on litter size and milk demand. This calculator covers growing pigs; size sow rations separately with a nutritionist if you keep breeding stock.
Yes. Complete rations usually give the best feed conversion, so you buy fewer total kilograms even if the bag costs more. Home-mixed corn and soy or scrap-heavy diets can be cheaper per bag but often slow gain and raise conversion, which can make cost per kilogram of gain equal or worse.