How Much Should You Feed Your Horse? A Complete Guide

Feeding your horse the right amount can feel like a guessing game — weight, activity level, age, season, it all matters. Here’s how to actually work it out, plus a quick tool if you just want a number right now.

If you’d rather understand the full picture — why these numbers work the way they do, and how to adjust as your horse’s life changes — keep reading. This guide covers everything from the basic rules of thumb to the mistakes that catch even experienced owners out.

The 2% Rule: Your Starting Point

Most feeding plans start with the same basic guideline: a horse should eat roughly 1.5% to 2.5% of its body weight in total feed per day, with the majority coming from forage rather than concentrates. For a 500 kg horse, that works out to somewhere between 7.5 kg and 12.5 kg of feed daily. This range is broadly consistent with guidance from The Horse, one of the most respected sources for evidence-based equine nutrition research.

This is a starting point, not a finished answer. The exact figure depends on activity level, age, and a handful of other factors we’ll walk through below — but it’s a solid place to begin thinking about your horse’s diet.

What Actually Affects How Much to Feed

The 2% rule gets you in the right neighbourhood, but every horse is an individual. Here’s what actually moves the number up or down.

Weight

This is the foundation everything else is built on. If you don’t have a scale, a weight tape formula works well: weight (kg) = (girth in cm)² × (length in cm) ÷ 11,900. A horse with an 180 cm girth and 160 cm length comes out to roughly 435 kg using this method.

Activity Level

A pasture pony hacked once a week needs a fraction of what a horse in daily training needs. As a guide: light work is 1–3 hours a week of riding, moderate work is 3–5 hours covering things like dressage or jumping, and intense work is 6+ hours — racing, eventing, or endurance territory.

Age and Life Stage

Growing horses need more protein and minerals to support development. Senior horses often need softer, easier-to-chew feeds, and may need dental checks every six months rather than annually. Pregnant and lactating mares have significantly higher demands than a horse in maintenance. For a broader look at the everyday essentials beyond feeding, our basic horse care guide covers grooming, hoof maintenance, and routine health checks.

Breed and Size

Draft breeds like Shires and Clydesdales need more forage simply due to size. Ponies and “easy keepers” often need less grain and more careful portion control, as they gain weight readily. Thoroughbreds and other lean, high-energy breeds often need more concentrates just to maintain condition.

Health Conditions

Insulin resistance, equine metabolic syndrome, and laminitis all call for low-sugar, low-starch diets. Dental issues may mean soaked feeds or chopped forage are necessary. If your horse has any of these, a vet or equine nutritionist should be involved in shaping the plan — general guidelines aren’t enough here.

Working Through the Calculation

Here’s the process in five steps, using a worked example throughout.

1. Find the weight. Use a scale if you have access to one, or the weight tape formula above. Our example horse weighs 500 kg.
2. Assess activity level. Our horse is in moderate work — 3–5 hours of riding per week.
3. Calculate total daily feed. Moderate work sits around 2.5% of body weight: 500 kg × 0.025 = 12.5 kg per day.
4. Split forage and concentrates. Forage should make up at least 1.5% of body weight — 7.5 kg for our horse. The remaining 5 kg comes from concentrates.
5. Adjust for anything special. Seniors, breeding mares, and horses with health conditions need further adjustment beyond this baseline.

10 Feeding Mistakes Worth Avoiding

Even experienced owners fall into a few common traps. Here are the ones that come up again and again.

• Overfeeding concentrates — calorie-dense feeds can quickly cause weight gain or insulin issues if overdone
• Underfeeding forage — less than 1.5% body weight in forage raises the risk of colic and ulcers
• Ignoring water intake — dehydration is a leading cause of impaction colic, especially in winter and summer extremes
• Feeding poor-quality or mouldy hay — inspect for dust, mould, and weeds before feeding
• Not adjusting for season — horses burn more calories staying warm in winter and need more water in summer heat
• Overlooking dental health — a horse that can’t chew properly can’t digest properly, regardless of what’s in the bucket
• Feeding one large meal — horses are designed for small, frequent meals; large meals raise colic risk
• Treating every horse the same — a one-size-fits-all diet across multiple horses almost always over- or under-feeds someone
• Introducing new feed too quickly — sudden diet changes can trigger colic or laminitis; transition over 7–10 days, since a horse’s gut microbiome needs time to adjust to new feed
• Over-supplementing — more isn’t always better, and some supplements can cause imbalances if stacked carelessly

Practical Feeding Habits That Help

Beyond the numbers, how and when you feed matters almost as much as how much.

• Split meals into 2–3 feeds rather than one large one, and provide continuous forage access where possible
• Score body condition regularly using a 1–9 scale, aiming for a 4–6 depending on breed and workload
• Check water daily — clean troughs, and consider heated buckets or electrolytes depending on season
• Store feed properly — dry, ventilated storage for hay, airtight containers for concentrates
• Watch your horse — a shiny coat and steady energy mean things are working; a dull coat or lethargy means it’s time to reassess

When to Bring in a Professional

This guide gives you a strong foundation, but there are moments where expert input matters more than any calculator. Reach out to your vet or an equine nutritionist if your horse has a metabolic condition, is losing or gaining weight unexpectedly, is pregnant or lactating, competes at a high level, or if you’re simply unsure whether the current plan is working. There’s no substitute for someone who can actually examine your horse.

Feeding your horse well doesn’t require perfection — it requires attention. Start with the guidelines above, watch how your horse responds, and adjust as needed. That’s really the whole job.

A well-fed horse is a happy horse — and a happy horse makes for a happy owner.