Rabbit Weight Calculator
This free rabbit weight calculator checks your rabbit against healthy adult weight ranges for 16+ breeds — from Netherland Dwarf to Flemish Giant — then goes further than a plain chart: score your rabbit’s body condition (BCS 1–5), estimate a baby bunny’s adult weight, and get daily hay, pellet and veg portions.
How the Rabbit Weight Calculator Works
| Size category | Example breeds | Healthy adult weight |
|---|---|---|
| Small / Dwarf | Netherland Dwarf, Mini Rex, Holland Lop | 0.9–1.8 kg (2–4 lb) |
| Medium | Dutch, Standard Rex, English Spot | 1.8–3.2 kg (4–7 lb) |
| Large | New Zealand, Californian, English Lop | 3.2–5.0 kg (7–11 lb) |
| Giant | Flemish Giant, Continental Giant | 5.9+ kg (13+ lb) |
What Is a Normal Weight for a Rabbit?
There is no single normal weight for a rabbit — it depends entirely on breed. A Netherland Dwarf is perfectly healthy at 0.7–1.1 kg (1.5–2.5 lb), a Dutch at around 2 kg (4.4 lb), a New Zealand at 4–5.4 kg (9–12 lb), and a Flemish Giant can top 6 kg (13 lb) and keep going. That is why the calculator asks for the breed first. If you don’t know the breed, pick the closest size category — small, medium, large or giant — and you’ll still get a sensible range to aim for.
How to Check Your Rabbit’s Weight
The most reliable way to check rabbit weight at home is the method rabbit owners swear by: a digital kitchen scale (a cheap one is fine). Put a bowl, box or basket on the scale, press tare to zero out the container, then gently sit your rabbit inside — a treat helps them stay still. For a large rabbit that won’t settle, weigh yourself holding the rabbit, then weigh yourself alone and subtract. Weigh at the same time of day, on the same scale, once a week, and write it down: a sudden drop or gain is one of the earliest signs a rabbit is unwell, often before any other symptom shows.
How to Tell If a Rabbit Is Underweight or Overweight
Weight on its own can’t tell fat from muscle, so vets use a body condition score (BCS) from 1 to 5 — the same idea as the PFMA/PDSA rabbit “Size-o-Meter.” Run your hands over three places. Ribs: you should feel them easily under a thin layer of fat; sharp and prominent means underweight, hard to feel means overweight. Spine: it should feel softly rounded, not a row of sharp bumps and not buried in fat. Hindquarters: firm and rounded, not hollow and not bulging with fat pads. An ideal rabbit scores a 3 out of 5. Use the Body Condition tab above to turn what you feel into a score — and see the Association for Pet Obesity Prevention rabbit BCS chart for reference pictures.
How Big Is a 1-Week-Old Rabbit, and How Big Will My Baby Bunny Get?
A 1-week-old kit is tiny — usually around 30–80 g depending on breed and litter size, with eyes still closed. From there, baby rabbits grow fast. A rough rule owners use is that a young rabbit is about 70% of its adult weight somewhere in the middle of its growth, so you can estimate the final size from the current age and weight — that’s exactly what the Baby → Adult tab does. Small and medium breeds reach their full adult weight by about 6–12 months, while large and giant breeds keep filling out until 12–18 months. The single best way to predict adult size is still weekly weigh-ins plotted over time, plus looking at the parents if you know them.
Is a 2-Year-Old Rabbit an Adult? How Heavy Is a Full-Grown Rabbit?
Yes — a 2-year-old rabbit is a full adult. Rabbits are physically mature well before then (6–12 months for most breeds, up to 18 months for giants), and a two-year-old is a young-to-middle-aged adult that should be sitting steady at its breed’s healthy weight. How heavy that is comes back to breed: a full-grown rabbit can weigh anywhere from under 1 kg for the smallest dwarfs to over 6 kg for a Flemish Giant. Once a rabbit is full-grown, the weight should stay fairly stable month to month — which is why tracking it is so useful.
The Famous Rabbit Weight Puzzle (Rabbit + Cat + Dog)
Searching for a rabbit weight calculator sometimes turns up the classic math riddle: a rabbit and cat weigh 10 kg, a rabbit and dog weigh 20 kg, and a cat and dog weigh 24 kg — so how much does each weigh? Add all three: 2 × (rabbit + cat + dog) = 54 kg, so the three together weigh 27 kg. Subtract each pair from 27 and you get rabbit = 3 kg, cat = 7 kg, dog = 17 kg. Fun fact: 3 kg is a believable weight for a real medium rabbit — but if you came here to check your actual pet, use the Healthy Weight tab at the top of this page.
Frequently Asked Questions
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