Rabbit Feed Calculator

A rabbit feed calculator takes a rabbit's weight and turns it into a clear daily amount of hay, pellets, vegetables, treats, and water. Rabbit owners often find advice scattered across many sources, some giving amounts in cups, some in grams, and the numbers rarely match each other. A calculator solves this by applying one consistent formula, so the result is a single set of numbers an owner can act on the same day. The base ratio behind most veterinary guidance is simple: about 80 percent of a rabbit's diet should be hay, 10 to 15 percent fresh vegetables, and roughly 5 percent pellets, with treats kept to a minimum. This ratio comes from the House Rabbit Society, one of the most cited authorities on pet rabbit care.

How Much Food Does a Rabbit Need Based on Body Weight?

Every formula in this section starts from one number: the rabbit's current body weight. Hay stays unlimited regardless of weight, but pellets, vegetables, treats, and water all scale up or down with how much the rabbit weighs. The sections below break down each part of the diet on its own, so an owner can look up hay, pellets, vegetables, treats, and water separately, then build a feeding schedule around them.

How Much Hay Does a Rabbit Need Per Day?

Hay is the one part of a rabbit's diet that should never be measured out or limited. A simple rule many rabbit owners rely on is that a rabbit should have access to a pile of hay roughly the same size as its own body every day, refreshed as it gets eaten or soiled. Grass hays, including timothy, orchard, meadow, and oat hay, are the right daily choice for adult rabbits. Alfalfa hay is higher in calcium and protein, which makes it suitable for young or nursing rabbits but too rich for a healthy adult. According to the House Rabbit Society, hay should make up about 80 percent of a rabbit's total diet. The MSD Veterinary Manual notes that timothy hay provides roughly 30 to 35 percent fiber, which is what keeps a rabbit's digestion moving and its teeth worn down at a healthy rate.

How Many Pellets Should a Rabbit Eat Daily?

Pellets should be measured out, not left in an open bowl. Most veterinary sources agree on a similar range: about 1/8 to 1/4 cup of pellets per 5 pounds of body weight per day for a healthy adult rabbit. The House Rabbit Society gives a close figure of 1/4 cup per 6 pounds of body weight. A good pellet should contain at least 18 percent fiber and should not include seeds, dried fruit, corn, or brightly colored pieces, since these are added for visual appeal rather than nutrition. Pellets work best as a supplement to hay, not a replacement for it, and feeding too many of them is one of the most common reasons rabbits become overweight.

How Many Vegetables Should a Rabbit Eat Each Day?

Fresh vegetables add moisture, vitamins, and variety to a rabbit's diet. The House Rabbit Society recommends a minimum of 2 cups of chopped leafy vegetables per 6 pounds of body weight each day, while other veterinary sources suggest a slightly lower range of 1 to 2 cups per 5 pounds. New vegetables should always be introduced one at a time and in small amounts, since a sudden change can upset a rabbit's digestion. Aim for at least three different types of leafy greens each day rather than relying on one or two favorites. Vegetables should not be added to a young rabbit's diet before around 12 weeks of age.

How Much of a Rabbit's Vegetable Portion Should Be Leafy Greens vs Other Vegetables?

Not all vegetables should make up an equal share of the daily portion. Leafy greens, such as romaine, basil, or bok choy, should account for around 75 percent of the fresh vegetable ration. Non-leafy vegetables, like bell pepper, celery, or broccoli, should stay under 15 percent of the total diet, roughly 1 tablespoon per 2 pounds of body weight per day. Some leafy greens, including parsley, mustard greens, and spring greens, are higher in oxalic acid, so it helps to rotate them so only one of the day's three greens comes from that group. This split comes from House Rabbit Society feeding guidance.

How Many Treats or Fruit Can a Rabbit Have?

Treats and fruit should stay under 10 percent of a rabbit's total diet, which works out to roughly 1 teaspoon to 1 tablespoon per 2 pounds of body weight, offered no more than once or twice a week. Fruit is high in natural sugar, and too much of it can cause digestive upset or make a rabbit less interested in eating the hay it actually needs. Small pieces of apple, banana, or berries make reasonable occasional treats, and hay-based treats are generally a gentler option than dried fruit or sugary mixes.

How Much Water Does a Rabbit Need Daily?

Rabbits need more water relative to their size than a dog or cat. According to the MSD Veterinary Manual, a healthy rabbit drinks around 120 milliliters of water per kilogram of body weight each day, roughly double the rate calculated for a similarly sized dog or cat. Rabbits also tend to drink more from an open, heavy bowl than from a sipper bottle, since a bowl is closer to how they would drink in the wild. Watch for dry or sticky gums and lethargy, both signs of dehydration. A dehydrated rabbit under veterinary care may need close to double its normal daily water intake.

How Many Times a Day Should You Feed a Rabbit?

Hay and water should be available at all times, with no set schedule needed for either. Pellets are usually split into two measured meals, one in the morning and one in the evening, rather than left out all day. Vegetables are typically offered once a day, either as a single serving or split into two smaller portions. Sticking to consistent feeding times helps an owner notice quickly if a rabbit's appetite drops, which is often the earliest sign that something is wrong.

How Do You Calculate a Rabbit's Daily Calorie Needs?

The weight-based formulas above work well for most rabbits, but owners managing a specific health condition, working with a vet, or wanting a more exact number can use a calorie-based method instead. This approach is used by some veterinary-grade feeding calculators and starts from a rabbit's basal metabolic rate rather than a simple weight ratio.

What Is the Formula for a Rabbit's Basal Metabolic Rate?

The MSD Veterinary Manual gives the following formula for a rabbit's basal metabolic rate, or BMR: BMR in kcal per day equals 70 multiplied by body weight in kilograms raised to the power of 0.75. As an example, a 2.5 kg rabbit would have a BMR of 70 times 2.5 to the power of 0.75, which comes out to roughly 147 kcal per day. This number represents the energy a rabbit needs simply to maintain itself at rest, before accounting for activity, growth, or illness.

How Does Activity Level Change a Rabbit's Calorie Needs?

BMR is multiplied by an activity or life-stage factor to reach a real daily calorie target. A sedentary or senior rabbit typically needs a factor of around 1.2 to 1.6, an active adult usually falls at the higher end of that range or slightly above it, and a growing juvenile can need a factor as high as 3.0 to support development. Illness or recovery can lower this factor below the maintenance range, since a sick rabbit's body is generally using less energy overall. These are general ranges, and individual rabbits can vary.

How Do You Convert Calorie Needs Into Grams of Hay and Pellets?

Once a daily calorie target is set, it can be split across food types using the same 80/15/5 ratio described earlier, then converted into grams using each food's calorie density. For example, a rabbit with a 188 kcal daily target might have roughly 169 kcal coming from hay, pellets, and vegetables combined, with about 19 kcal left over as a treat allowance. Most owners will not need to work through this level of detail for everyday feeding. The weight-based formulas covered earlier are accurate enough for typical, healthy rabbits.

How Does a Rabbit's Life Stage Change Its Food Amount?

A rabbit's nutritional needs shift substantially between birth and old age. Using the age brackets set out by the House Rabbit Society, a rabbit's diet moves through five stages: baby, juvenile, young adult, adult, and senior. The biggest changes across these stages are the type of hay offered, how much pellets are limited, and the point at which vegetables are introduced.

How Much Should a Baby Rabbit (Kit) Eat?

For the first three weeks of life, kits rely entirely on their mother's milk. From around three to four weeks old, they begin nibbling on hay and alfalfa-based pellets, usually while still nursing. Unlimited alfalfa hay and alfalfa pellets are appropriate at this stage because of the higher protein and calcium a growing kit needs. Vegetables should not be introduced yet. Weaning before six weeks old is risky, since a kit's gut bacteria are not fully developed and early weaning is linked to serious digestive illness.

How Much Should a Juvenile Rabbit Eat?

Between around 7 weeks and 7 months old, a rabbit can have unlimited alfalfa hay and unlimited alfalfa-based pellets to support rapid growth. Fresh vegetables can be introduced gradually starting around 12 weeks old, one type at a time and in small amounts, watching closely for any signs of soft stool.

How Much Should a Young Adult Rabbit Eat During the Transition Period?

The stretch between 7 months and 1 year old is often overlooked, with owners jumping straight from juvenile portions to standard adult amounts. The House Rabbit Society treats this as its own transition stage, recommending unlimited grass hay, about 1/2 cup of timothy pellets, 1 cup of fresh greens, and up to 1 ounce of treats per day. Alfalfa hay and alfalfa pellets should be phased out gradually over several weeks during this period rather than stopped all at once, since a sudden switch can upset digestion.

How Much Should an Adult Rabbit Eat?

From about 1 to 5 years old, a rabbit's diet should settle into a consistent routine: unlimited grass hay, pellets measured against body weight using the formula covered earlier, and daily fresh vegetables. Alfalfa hay is no longer needed at this stage and should be fully replaced by grass hay. Feeding times and portion sizes should stay consistent day to day, and it is still worth rechecking portions every few months as weight or activity level changes.

How Much Should a Senior Rabbit Eat?

Rabbits six years and older often need a somewhat smaller pellet portion, since their metabolism slows with age, while hay should stay unlimited as always. The House Rabbit Society notes that underweight seniors may need alfalfa hay and pellets added back into the diet, along with more greens and treats than a standard adult, up to around 2 cups of greens and 2 ounces of treats daily. Because weight loss in older rabbits can point to dental or other health problems rather than diet alone, more frequent weigh-ins are worth the effort at this stage.

How Do Breed Size and Body Weight Affect Rabbit Food Portions?

Every formula covered so far scales with actual body weight, which means breed size mostly matters as a starting reference point for an owner who is not yet sure exactly how much their rabbit weighs. The three broad weight classes below give a sense of what typical portions look like, but the number entered into any calculator should always be the rabbit's real weight rather than a breed average.

How Much Food Does a Dwarf or Small Rabbit Need?

Breeds under about 2 kg (4.5 lb), including Netherland Dwarfs and Mini Lops, fall into the small category. Applying the standard formulas, a 1.5 to 2 kg dwarf rabbit would need roughly 1 to 1.5 tablespoons of pellets, about 3/4 cup of vegetables, and unlimited hay each day. Small breeds tend to have a faster metabolism than larger rabbits, so it is worth watching body condition closely, since small miscalculations have a bigger relative effect on a smaller animal.

How Much Food Does a Medium Rabbit Need?

The 2 to 4 kg range covers many of the most common pet rabbit breeds. A 3 kg medium rabbit would need roughly 1/4 cup of pellets, around 1.5 to 2 cups of vegetables, and unlimited hay each day, following the same ratios used throughout this guide.

How Much Food Does a Large or Giant Rabbit Need?

Breeds over 4 kg, such as Flemish Giants and French Lops, need proportionally more food but should still follow the same percentage split rather than simply being given a larger flat amount. A 5 to 6 kg large or giant rabbit would need roughly 1/3 to 1/2 cup of pellets and 2.5 to 3 cups of vegetables daily, alongside unlimited hay. Giant breeds are also more prone to weight gain, so pellet portions are worth watching closely.

How Does Activity Level and Health Status Change a Rabbit's Feeding Amount?

Beyond weight, age, and breed, several other factors can shift how much a rabbit should be fed. The sections below cover four of the most common adjustments: neuter status, pregnancy or nursing, current weight condition, and environment. Each of these sits on top of the base weight formula rather than replacing it.

How Much Should a Spayed or Neutered Rabbit Eat?

Metabolism can slow down somewhat after spaying or neutering, which means pellet portions may need a small reduction to avoid weight gain over time. One cited study found that neutered rabbits were over five times more likely to become overweight than intact rabbits. Rather than cutting food by a fixed amount, it is more reliable to watch body condition over the following months and adjust gradually if the rabbit starts putting on weight.

How Much Should a Pregnant or Nursing Rabbit Eat?

Pregnant and nursing does need noticeably more food to support the extra protein and calcium demands of pregnancy and milk production. Many owners switch a pregnant or nursing doe to unlimited alfalfa hay and pellets rather than sticking to measured portions during this period. A bigger appetite at this stage is completely normal and should not be restricted the way a standard adult's diet would be.

How Much Should an Overweight or Underweight Rabbit Eat?

Body condition scoring is the most practical way to check whether a rabbit's portions are actually working, since it involves feeling for the spine and hip bones through a thin layer of fat rather than relying on weight alone. This is similar to the approach used in the UK Pet Food Rabbit Size-O-Meter. For an overweight rabbit, the first step is usually to reduce pellets and treats while keeping hay unlimited. It is worth knowing that obesity in rabbits raises the risk of flystrike, since an overweight rabbit often cannot groom itself properly or reach its own cecotrophs, and it can also contribute to bladder sludge from excess calcium. For an underweight rabbit, a small increase in pellets can help, but it is worth checking for dental or other health issues first rather than assuming diet is the only cause. Either extreme is worth a veterinary check.

How Does Temperature and Stress Affect a Rabbit's Food Needs?

Two adjustment factors are easy to miss. The first is environment: rabbits kept outdoors burn more energy staying warm through cold weather and may need slightly more food in winter, while indoor house rabbits generally need less, since they are not working to regulate their body temperature the same way. The second is stress. New surroundings, illness, or the arrival of a new companion can all reduce a rabbit's appetite temporarily. If a rabbit stops eating for more than a few hours, that calls for prompt attention rather than simply offering more food.

How Do You Use a Rabbit Food Calculator Step by Step?

Using the calculator on this page takes only a few steps. Enter the rabbit's current weight, select an age or life stage, choose an activity or health status if relevant, then read through the results.

What Information Do You Need to Enter Into the Calculator?

The calculator needs the rabbit's current body weight in kilograms or pounds, an approximate age or life stage, whether the rabbit is spayed or neutered, and any relevant note such as pregnancy. Weight drives the base numbers, age determines which formula applies, and neuter or pregnancy status fine-tunes the result, as covered in the sections above.

How Do You Read the Calculator's Results?

The output separates daily amounts for hay, pellets, vegetables, treats, and water, and many calculators also show weekly or monthly totals, which are useful for planning shopping trips. These numbers are a starting point rather than a fixed rule. It is worth adjusting them over time based on the rabbit's actual body condition rather than following the output exactly forever.

How Do You Calculate How Much Hay to Buy at Once?

Turning a daily hay amount into a buying quantity avoids two common problems. Buying too much hay at once risks it going stale or even moldy before the rabbit finishes it, which wastes money and can make a rabbit unwilling to eat it. Buying too little risks running out and having to fall back on lower-quality hay from a local store shelf. As an example, a 6 lb rabbit eating roughly a body-sized pile of hay daily would need around 6 to 7 lb of hay to cover a 4-week buying period, though this varies with how compactly the hay is packed.

What Mistakes Should You Avoid When Calculating Rabbit Food?

Most feeding problems in pet rabbits trace back to a small number of repeated mistakes. The three below come up most often in veterinary advice and rabbit owner forums alike.

What Happens If You Feed Too Many Pellets?

Feeding too many pellets is the single most common cause of rabbit obesity and dental disease. A diet too heavy in pellets and too light in hay does not provide enough long fiber to keep a rabbit's teeth worn down or its gut moving properly. If a rabbit has been getting too many pellets, the fix is to reduce the amount gradually back to the standard formula while making sure hay stays fully available, rather than cutting pellets abruptly.

What Happens If You Don't Feed Enough Hay?

Too little hay can lead to two serious problems: overgrown teeth from reduced chewing, and a slowdown in digestion that can progress to GI stasis, a genuine emergency in rabbits. A rabbit that has not produced droppings for six hours or more needs immediate veterinary attention rather than a wait-and-see approach.

Why Should You Introduce New Foods Gradually?

A rabbit's digestive system is sensitive to sudden change, whether that means a new hay type, a new vegetable, or even a different pellet brand. Introducing anything new over a period of one to two weeks, mixing it gradually with the current food, gives the gut time to adjust. Watch for soft droppings during a transition, since that is the clearest sign to slow the change down.

What Else Should You Know About Feeding a Healthy Rabbit?

Getting the daily portions right is only part of feeding a healthy rabbit. Food safety, monthly cost, body condition, digestion, and knowing when something is wrong all matter just as much. The sections below cover each of these in the context of the numbers already calculated above.

What Vegetables Are Safe for Rabbits to Eat?

Everyday safe choices include romaine lettuce, cilantro, parsley, basil, and bok choy, and variety matters more than sticking to one or two favorites. For the complete list of safe vegetables, along with how much of each to feed, the Rabbit-Safe Vegetables List covers it in full.

What Foods Are Toxic or Unsafe for Rabbits?

A few commonly confused foods are worth flagging here: iceberg lettuce offers little nutrition, onions and garlic can cause digestive harm, and rhubarb leaves and chocolate are genuinely toxic to rabbits. For the full rundown of what to avoid and why, the Toxic Foods for Rabbits guide covers it in detail.

What Type of Hay Is Best for Rabbits?

Timothy, orchard, meadow, and oat hay all work well for adult rabbits, while alfalfa hay stays reserved for young or nursing rabbits, as covered earlier in this guide. Each grass hay differs slightly in texture, cost, and how eagerly a rabbit takes to it. The Types of Rabbit Hay Guide breaks down the differences in full.

How Much Does It Cost to Feed a Rabbit Each Month?

Taking the daily amounts already calculated and scaling them up gives a rough monthly cost. A mid-size rabbit's hay and pellets alone typically add up to a noticeable but manageable monthly expense. For a complete cost breakdown that includes supplies beyond food, the Rabbit Cost Calculator walks through the full picture.

How Do You Know If Your Rabbit Is a Healthy Weight?

The numbers from any feeding calculator are only a starting point. Body condition scoring is how an owner checks whether those numbers are actually working, by feeling for the ribs and hips through a light layer of fat. The Rabbit Body Condition Score Guide explains the hands-on check step by step.

What Are the Signs of Gastrointestinal Stasis in Rabbits?

No droppings for six hours or more, a sudden loss of appetite, and noticeable lethargy are the warning signs to watch for, and any of them calls for immediate veterinary care rather than a diet adjustment at home. The Rabbit GI Stasis Guide covers the full emergency picture, including what to do while waiting for a vet.

How Do You Care for a Pregnant Rabbit's Diet?

The extra food a pregnant or nursing doe needs, covered earlier in this guide, is only one part of caring for a pregnant rabbit. Timing, nest box preparation, and ongoing monitoring all matter too. The Rabbit Pregnancy Calculator covers the full pregnancy timeline alongside feeding needs.

How Do You Transition a Rabbit to a New Food?

Switching hay brands, changing pellets, or introducing a new vegetable all call for the same gradual approach described earlier in this guide. For a full day-by-day schedule that takes the guesswork out of it, the Rabbit Diet Transition Guide lays out each step.

Why Do Rabbits Eat Their Own Droppings?

Rabbits produce two types of droppings: hard fecal pellets and soft cecotrophs. They eat the cecotrophs directly from their body, which allows them to absorb nutrients like B vitamins and volatile fatty acids that were not fully absorbed the first time through the gut. This is completely normal behavior, not a sign of illness. Uneaten cecotrophs stuck around the cage, however, can point to an obesity or dental problem stopping the rabbit from reaching them. The Rabbit Digestive System Guide explains the full process.

What Is Flystrike and How Is It Linked to a Rabbit's Diet?

An overweight or unwell rabbit that cannot groom itself or reach its cecotrophs is at higher risk of soiled fur, which can attract flies. Those flies can lay eggs that hatch into maggots within hours, a condition known as flystrike. Correct portioning and regular weight checks are one of the simplest ways to reduce this risk. The Flystrike in Rabbits Guide covers prevention and emergency steps in full.

Frequently Asked Questions

How much should I feed a rabbit per day?

It depends on weight and age, but as a general starting point, an adult rabbit needs unlimited hay, about 1/4 cup of pellets per 6 lb of body weight, and at least 2 cups of fresh vegetables per 6 lb of body weight each day.

Can rabbits eat too much hay?

No. Hay should always be available in unlimited amounts. Rabbits are very unlikely to overeat hay, and it is far more common for rabbits to get too little of it rather than too much.

How do I know if I am overfeeding my rabbit?

Weight gain, soft stool, and a rabbit ignoring its hay in favor of pellets or treats are the clearest signs. Regular weigh-ins and body condition checks make this easier to catch early.

Should I feed alfalfa or timothy hay?

Alfalfa hay suits young, pregnant, or nursing rabbits because of its higher protein and calcium. Timothy and other grass hays (orchard, meadow, oat) are the correct choice for healthy adult rabbits.