Rabbits • weight-growthVerified Scientific Formula
Rabbit Breed Size & Ideal Weight Calculator
Compares your rabbit's scale weight against ARBA breed standard adult weight classifications.
Enter Parameters
Calculated Output
Current Scale Weight
5lbs4 – 6 lbs Standard Breed Range
Estimated Expected Range: 4 – 6 lbs
What This Result Means
For Small breeds, standard adult weight is 4–6 lbs. Current weight is 5 lbs.
Calculation Details & Practical Equivalents
Standard Category Range
4 – 6 lbs
Unlimited Grass Hay Need
80–85% of daily diet
Pellet Portion (~1/8 cup per 5 lbs)
0.13 cups/day
Formula & Mathematical Methodology
Standard Mathematical Formula
Compares scale weight to ARBA breed category boundaries (Dwarf <4 lbs, Small 4-6 lbs, Medium 6-9 lbs, Large 9-11 lbs, Giant >11 lbs)
Formula Variables Defined
BWRabbit Weight(lbs or kg)
Scale weight
Step-by-Step Calculation Example
Example: 5.5 lb Mini Rex
- Small breed standard = 4.0 to 6.0 lbs (1.8 to 2.7 kg)
Final Output: Ideal weight range (4.0 – 6.0 lbs)
Key Assumptions
- Adult rabbit over 6 months old.
Biological Limitations
Verified Scientific & Veterinary Sources
Version: 1.0•Methodology Reviewed: 2026-01-22
1. The Merck Veterinary Manual (11th Edition)textbook
Aiello, S.E. and Moses, M.A. (Eds.) (2020). Merck & Co., Inc., Kenilworth, NJ
Access Source Authority Rabbit Breed Size & Ideal Weight Calculator — FAQs
Timothy or meadow grass hay should comprise at least 80% to 85% of an adult rabbit's daily diet to promote continuous dental wear and gut motility.