This tool provides a general estimate and does not replace professional veterinary advice.
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What is the Rabbit Food Calculator?
The Rabbit Food Calculator calculates daily food portion in grams or cups for rabbits based on weight, age and activity level. Overfeeding is one of the most common and most preventable health problems in pets, while underfeeding a growing or active animal can slow development or sap energy.
Expect roughly 8-12 years with a rabbit, which is worth factoring into any long-term plan. They are a herbivore, so their nutritional needs shift with age, size and activity. Rabbits need a large pen or free-roam room rather than a hutch, with unlimited hay, a litter tray and several hours of daily exercise outside the enclosure. Keep an eye out for dental overgrowth from too little hay, GI stasis, flystrike. These are the conditions rabbits are most commonly seen for.
Rabbit quick facts
| Measure | Rabbit |
|---|---|
| Typical lifespan | 8–12 years |
| Diet | Herbivore |
| Mature at | About 7 months |
| Pregnancy | 28–33 days |
| Litter size | 4–12 |
| Humidity | 40–60% |
How does the Rabbit Food Calculator work?
The estimate starts from a resting-energy formula based on body weight, then adjusts for activity level, life stage and, where relevant, the specific nutritional profile of rabbits. Use it to know roughly where you stand and what to ask about, not to rule anything in or out on its own.
Factors that matter
- Body weight: the single biggest driver of daily calorie needs
- Activity level: a sedentary indoor animal needs meaningfully less than an active or working one
- Life stage: since growing, pregnant or nursing animals need more energy per kilogram than a stable adult
- Spay/neuter status: which typically lowers metabolic needs somewhat
How do you use the Rabbit Food Calculator?
- Enter the body weight in whichever unit you use (lb, oz, kg)
- Pick your activity level (Low, Moderate, High)
- Enter the calories per cup of your food
- Press Calculate, then read the result alongside the sources listed below
Bring the number to your next appointment. Vets can work with a figure and a date far more easily than with "he seems a bit off lately".
For related questions, see the other nutrition tools or browse every rabbit tool.
Before you rely on this
One number on one day is rarely the full picture. What matters more is the direction of travel: whether your rabbit is trending steadily, drifting, or changing suddenly. A sudden change is always worth a call to your vet, even when the individual figure still falls inside a normal range.
Sources and references
The formulas, reference ranges and species data behind the Rabbit Food Calculator come from these veterinary references, professional bodies and published research.
- rabbitwelfare.co.ukRabbit Welfare Association and Fundrabbitwelfare.co.uk(opens in a new tab)
- Merck Veterinary ManualRabbitsmerckvetmanual.com(opens in a new tab)
- wsava.orgWSAVA Global Nutrition Guidelineswsava.org(opens in a new tab)
- RSPCAAdvice and Welfarerspca.org.uk(opens in a new tab)
- pdsa.org.ukPDSA Pet Health Hubpdsa.org.uk(opens in a new tab)
- Built on veterinary referencesFormulas and ranges come from veterinary manuals, university research and welfare bodies, listed above for you to check.
- Instant resultsNo page reload, no waiting and no account. Enter your details and the result appears straight away.
- Private by designCalculations run in your browser. Nothing you enter is stored on our servers or shared with anyone.
- Always freeEvery XpertsPet tool is free to use, with no premium tier and nothing to sign up for.