Horse Feed Calculator
Calculate your horse's daily hay and grain requirements based on body weight, work level, and hay quality using standard equine nutrition guidelines.
Quick Answer
A horse should consume 1.5–2.5% of its body weight in forage daily. A typical 1,000 lb horse in light work needs about 18 lbs of hay and 5 lbs of grain per day, totaling roughly 23 lbs of feed. Hay quality and work intensity determine the exact ratio.
Results
Your 1,000 lb horse at light work level needs 18 lbs of hay and 5 lbs of graindaily. That's roughly 5 flakes of haysplit across 2–3 feedings. Grain should be divided into at least 2 meals to reduce digestive stress.
Monthly Feed Estimates
Estimates assume a 50 lb hay bale and 50 lb grain bag. Actual bale weight varies by type and density.
Suggested Feeding Schedule
Horses should never go more than 8 hours without forage. Consider adding a midday hay feeding or using a slow feeder to extend eating time.
Important Note
These are general guidelines based on standard equine nutrition principles. Every horse is different. Factors like breed, metabolism, age, climate, pasture access, and health conditions all affect feed requirements. Always consult an equine nutritionist or veterinarian for a personalized feeding plan, especially for horses with metabolic issues like insulin resistance or Cushing's disease.
About This Tool
The Horse Feed Calculator uses standard equine nutrition guidelines to determine how much hay and grain your horse needs each day. The foundation of any horse's diet is forage, typically hay or pasture, which should make up the majority of daily intake. This calculator takes your horse's body weight, workload, and the quality of available hay to produce a practical, actionable feeding plan that keeps your horse healthy and properly nourished.
The Forage-First Principle
Horses evolved as grazing animals that spent 16 to 18 hours a day eating fibrous plant material. Their entire digestive system, from the teeth designed for grinding to the massive hindgut designed for fermenting fiber, is built around continuous forage intake. The general rule is that a horse should consume between 1.5% and 2.5% of its body weight in forage daily. For a 1,000-pound horse, that translates to 15 to 25 pounds of hay per day. Falling below 1.5% of body weight in forage increases the risk of colic, gastric ulcers, and stereotypic behaviors like cribbing and wood chewing. The exact percentage within this range depends on work level, with harder-working horses getting a slightly lower forage percentage because grain makes up a larger share of their diet.
How Work Level Affects Feed Requirements
A horse standing in a pasture with no riding demands has very different caloric needs than one competing in eventing or endurance racing. Maintenance horses typically need only forage and possibly a ration balancer to fill vitamin and mineral gaps. Light work horses doing casual trail rides or light schooling a few times per week need a modest grain supplement of about 0.5 pounds per 100 pounds of body weight. Moderate work horses in regular training or competition benefit from 0.75 pounds of grain per 100 pounds of body weight to fuel performance and recovery. Heavy work horses, including racehorses, endurance horses, and those in intense daily training, may need a full pound of grain per 100 pounds of body weight. It is critical to never exceed 0.5% of body weight in grain per single feeding to avoid digestive upset and laminitis risk.
Why Hay Quality Matters
Not all hay is created equal. Premium hay that is leafy, green, and cut early in the growing season contains more digestible energy and protein per pound, meaning your horse needs slightly less of it to meet nutritional requirements. Fair-quality hay that is stemmy, late-cut, and less nutritious requires feeding about 10% more by weight to compensate for the lower nutrient density. The type of hay also matters: alfalfa is significantly higher in calories and protein than grass hays like timothy or orchard grass, making it more suitable for hard-working horses, growing foals, and lactating mares but potentially too rich for easy keepers and metabolically sensitive horses. A hay analysis from your local agricultural extension office costs as little as 25 dollars and provides exact nutritional values for your specific hay lot.
Feeding Schedule and Digestive Health
Horses produce stomach acid continuously, unlike humans who produce it mainly when eating. This means an empty stomach quickly becomes an acidic one, leading to gastric ulcers, which affect an estimated 60 to 90 percent of performance horses. The simplest prevention is to never let a horse go more than four to six hours without forage. Split the daily hay ration into at least two feedings, ideally three, and use slow-feed hay nets to extend eating time. Grain meals should always be kept small and fed after hay, not before, because the fiber mat created by hay in the stomach helps buffer acid and slow the passage of starch through the digestive system. Feeding large grain meals on an empty stomach is one of the most common causes of hindgut acidosis and colic.
Water and Electrolyte Considerations
A horse at maintenance drinks 5 to 10 gallons of water per day, but a horse in heavy work during hot weather can drink 20 gallons or more. Adequate water intake is essential for proper digestion of all that forage, as the fermentation process in the hindgut requires a significant volume of liquid. Always provide free-choice access to clean water and a salt block. Horses in moderate to heavy work, especially during summer, may benefit from supplemental electrolytes added to feed or water. Dehydration reduces feed efficiency and increases the risk of impaction colic, where dry feed material blocks the intestine.
Common Feeding Mistakes to Avoid
The most dangerous mistake horse owners make is feeding too much grain and too little hay. Grain is concentrated energy that ferments rapidly, while hay ferments slowly and safely in the hindgut. Overfeeding grain relative to forage is the leading dietary cause of colic and laminitis. Another common error is changing feed types or amounts abruptly rather than gradually over 7 to 14 days, which disrupts the microbial population in the hindgut and can trigger digestive crisis. Feeding by volume rather than by weight is also problematic because different feeds have vastly different densities. A coffee can of pellets weighs much more than a coffee can of sweet feed. Always weigh feed portions, at least initially, to calibrate your eye and your scoop.