Dog Collar Size Calculator
Measure first. Compare the exact product.
Keep a useful neck measurement record.
A useful neck measurement, ready to keep.
Measure the neck following the specific collar’s instructions.
A clearer starting point for a better fit.
Your record will show both unit systems, ready to print or download. No universal S, M, or L size is assigned.
Record the right neck measurement
- Find the measurement instructions for the exact collar you are considering. Different designs can require different measuring and fit checks.
- Enter the neck measurement in inches or centimeters. Weight is an optional reference, not the basis of a size recommendation.
- Compare the converted measurement with the product’s adjustable range and check the fitted collar according to its instructions.
A worked example
A 12-inch neck measurement converts to 30.48 cm, displayed as 30.5 cm in the record. Use the original precise measurement near a product’s sizing boundary.
Common questions
Does the calculator choose a collar size?
It creates a dual-unit measurement record. The exact product chart determines which size may fit.
Will my measurements be saved?
No. Use print or download to keep your record.
Can I reuse the harness measurement?
Check the product’s instructions first; the measuring location can differ.
Sources & editorial notes
AKC: measuring your dog for gear. Sources consulted November 3, 2026. PostPuppies developed the organizational examples and calculations. No veterinary review is claimed.