Neck Size Calculator
Estimate neck-to-height ratio, shirt collar allowance and body-size category from your measurements.
Hit Calculate to see your neck-size zone
Calculate to estimate collar size
Metrics appear after calculation
Your explanation appears here
Neck circumference changes with tape placement and posture; use a relaxed, level measurement for shirts.
Your plan appears after calculation
Test a different neck measurement or collar ease without changing your main result.
Calculate your baseline first
It compares your measured neck circumference with your height to estimate a neck-to-height ratio, then adds your selected ease allowance to suggest a practical shirt collar size.
Measure around the lower neck where a shirt collar naturally rests. Keep the tape level and snug, but not tight. For shirts, many people add about one finger of ease.
No. Neck size can provide sizing and body-composition context, but it cannot diagnose health status. Discuss breathing, sleep, metabolic or medical concerns with a qualified clinician.
Results are estimates generated locally in your browser from circumference, height, weight and fit-ease inputs. They are for informational and clothing-size guidance only, not medical diagnosis, risk screening or professional tailoring advice. Measurement technique, posture and brand sizing can change the final fit. VisionVix accepts no liability for decisions based on this output.