Homestead Pig Feed Calculator
Created by: Emma Collins
Last updated:
Plan pig feed, bag counts, cost per pound of gain, and finish weight using stage-specific feed rates and FCR guidance for homestead herds.
Homestead Pig Feed Calculator
HomesteadPlan daily feed, bag counts, cost per pound of gain, and projected finish weight.
Feed type note
Balanced corn/soy ration with premix
What is a Homestead Pig Feed Calculator?
A Homestead Pig Feed Calculator estimates daily feed, bag counts, total cost, and projected weight gain for pigs from feeder stage through finishing. By entering pig stage, weight, herd size, feeding days, feed type, and bag price, it returns a clear plan that shows how many pounds you will feed, how much it costs, and what weight you can expect at the end of the period.
Daily Feed (lb/pig) = Body Weight × Feed %
Total Feed (lb) = Daily Feed × Pigs × Days
Bags Needed = Total Feed ÷ 50
Projected Gain (lb) = ADG × Days
Cost per lb Gain = (Total Feed ÷ 50 × Bag Cost) ÷ Projected Gain
The formulas use extension-style feed percentages (4-6% of body weight) and practical feed conversion ratios for backyard herds. Results flag when intake or FCR moves into costly territory so you can adjust ration energy, feeder placement, or stocking density.
How It Works
Pick the pig stage to load default feed percentages and average daily gain. Adjust feed type to account for ration energy differences. The calculator multiplies daily feed per pig by herd size and days to get total pounds and bag counts. It then applies ADG and FCR ranges to forecast weight gain and cost per pound of gain.
Use this to time your move from grower to finisher, compare ration options, and keep a running budget for each batch of pigs.
Example Calculations
Grower pigs (100 lb) for 90 days: Feed ~5 lb/pig/day (5% BW). For 2 pigs that is ~900 lb feed (~18 bags). At $18/bag, feed costs ~$324. With 2.0 lb/day ADG, pigs gain ~180 lb, finishing near 280 lb.
Finisher phase (180 lb) for 45 days: Feed ~8 lb/pig/day (4.5% BW). Two pigs eat ~720 lb (~15 bags). Cost ~$270. At 2.1 lb/day ADG they add ~95 lb, finishing near 275 lb.
Common Applications
- Budget feed for a batch of feeder pigs from purchase to butcher date.
- Compare cost per pound of gain between commercial ration and on-farm mixes.
- Decide when to switch from grower to finisher ration based on intake and weight.
- Plan feed storage space and delivery schedule to avoid shortages.
- Track winter vs summer feed efficiency when heat stress changes intake.
Tips for Better Feed Efficiency
- Keep water clean and flowing — dry feeders plus limited water crush intake and growth.
- Shade and airflow in summer protect ADG; deep bedding and draft control help in winter.
- Adjust feeders so pigs cannot sort or flip feed; spilled feed ruins FCR quickly.
- Split heavy feedings into two or three times daily in extreme heat to maintain appetite.
Frequently Asked Questions
How much feed does a pig need per day?
Most growing pigs eat 4-6% of body weight per day. Lighter feeder pigs are closer to 6%, while finishers near market weight often land around 4-4.5%. Sows in gestation hold steady near 4 lbs/day, but lactating sows jump to 10-14 lbs/day depending on litter size and milk demand.
How do I estimate feed for a full finishing period?
Use body weight, age stage, and days in the feeding period. Multiply daily feed per pig by herd size and by days, then divide by 50 to get bag counts. Add a 5-10% buffer for waste or weather interruptions. The calculator does these steps automatically and returns bags, cost, and projected weight gain.
What is a good feed conversion ratio (FCR) for homestead pigs?
Efficient grow-finish pigs often land between 2.5:1 and 3.5:1 pounds of feed per pound of gain. Genetics, ration quality, water availability, and housing all move that number. If you see FCR creeping above 3.6 with good health and housing, check ration energy and feeder management for waste.
How does feed type change cost per pound of gain?
Complete rations usually have the best FCR, so you buy fewer total pounds even if the price per bag is slightly higher. Home-mixed corn/soy or scrap-heavy diets can be cheaper per bag but often slow average daily gain and raise FCR, which can make the cost per pound of gain equal or worse over the whole period.
How many days to reach market weight?
From 50 lb to 250-280 lb, typical homestead pigs need 90-140 days depending on genetics, ration energy, weather, and health. Faster growth (ADG 2.2-2.5 lb) finishes closer to 100 days. Slower growth, heat stress, or low-energy feed can extend finishing to 4-5 months.
Should I split feeding phases?
Yes. Feeding a grower ration to 125-150 lb and switching to a finisher ration afterward often improves efficiency. The calculator models a single ration for simplicity but shows cost and weight progression so you can decide when to shift protein and energy levels in your own program.
How much space and water do pigs need while feeding?
Plan for 8-10 square feet per growing pig in covered shelter and free-choice clean water at all times. Water limits quickly reduce feed intake and slow gain. Outdoor or deep-bedded pens need good drainage so feed is not wasted into mud, which also hurts FCR and health.
Sources and References
- National Research Council. Nutrient Requirements of Swine. National Academies Press, 2012.
- Iowa State Extension. Swine Feed Efficiency Benchmarks and Practices, 2024.
- University of Minnesota Extension. Managing Finishing Pigs for Profitability, 2023.
- USDA Agricultural Research Service. Swine Growth and Feed Intake Data, 2025.