How much to feed a Rex: portion guidance by weight and a free calculator. Rex rabbits are medium plush-coated rabbits prone to sore hocks, which
Rex feeding calculator
Enter a weight to get personalised daily portions. The calculator is preset for you — just add the weight and details.
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Pet Feeding Calculator
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Look for "Calorie Content" or "Metabolizable Energy (ME)" — usually near the ingredients list on the back or side of the bag or can. It reads something like "3,500 kcal/kg" or "350 kcal/cup". Match the toggle above to whichever unit your label shows. Can't find it? Use the list option — it's accurate enough for most foods.
We'll subtract this from the daily food portion.
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Daily feeding guide
These figures are estimates based on NRC/AAFCO veterinary nutrition formulas. Individual animals vary by up to ±20%. Adjust based on your pet's body condition over 4–6 weeks. Always consult your vet for medical dietary needs.
About the Rex
Rex rabbits are medium plush-coated rabbits prone to sore hocks, which excess weight worsens — keeping them lean protects their feet. A typical adult weighs about 1.4–3.6 kg.
How much should a Rex eat?
Calorie needs use the veterinary formula 70 × weight(kg)0.75 (the Resting Energy Requirement), multiplied by a lifestyle factor of ×1.5 for a typical rabbit at the life stage shown. Enter your own animal's details in the calculator for an exact figure.
Body weight
Daily calories
1.4 kg
135 kcal
1.714 kg
157 kcal
2.029 kg
179 kcal
2.343 kg
199 kcal
2.657 kg
219 kcal
2.971 kg
238 kcal
3.286 kg
256 kcal
3.6 kg
274 kcal
What to feed
A rabbit's diet should be roughly 80-90% grass hay (timothy, orchard, meadow), a daily portion of leafy greens, and only a small measured amount of pellets. Muesli-style mixes should be avoided — rabbits selectively eat the sugary bits and leave the fibre, causing dental disease and gut stasis.
Hay is offered free-choice, topped up throughout the day. Pellets and greens are given in one or two measured servings. A rabbit that stops eating for 12 hours is a medical emergency (gut stasis).
Frequently asked questions
How much should I feed a Rex rabbit?
About 50-70 g of pellets a day for a ~2.5 kg Rex, plus unlimited hay and greens. Lean weight helps prevent the sore hocks the breed is prone to.
How many pellets should I feed my rabbit?
A rough guide is 25 g of quality pellets per kg of body weight per day — so about 50 g for a 2 kg rabbit — alongside unlimited hay. Growing rabbits under six months can have more, plus alfalfa hay.