Written By: Gloria Tsang, RD
Title: Founding Registered Dietitian
Alumni: University of British Columbia
Last Updated on:
BMI & Ideal Weight Calculator
BMI (Body Mass Index) is a health risk indicator based on your weight and height. Healthcare professionals often use BMI data to determine a person’s risk of developing health problems. This BMI and Ideal Weight calculator was created based on guidelines from the following sources:
BMI & Ideal Weight Calculator
Weight:
Height:
Gender:
A BMI between 18.5 and 24.9 is considered healthy, indicating that your weight matches well with your height. This range suggests you’re in a good zone for overall health and well-being.
BMI Categories
- Underweight: <18.5
- Normal weight: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obesity: >30
- Obesity Class I: 30.0 – 34.9
- Obesity Class II: 35.0 – 39.9
- Obesity Class III: >=40.0
Disclaimer: This calculator is for general informational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. Always consult a registered dietitian or other qualified healthcare professionals if you have questions about your health or nutritional needs.
Sources
HealthCastle has strict sourcing guidelines. We reference peer-reviewed studies, scientific journals and associations. We only use quality, credible sources to ensure content accuracy and integrity.
- Health Canada. “Canadian Guidelines for Body Weight Classification in Adults.” Government of Canada, 9 June 2003, https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/healthy-weights/canadian-guidelines-body-weight-classification-adults/questions-answers-public.html ↩︎
- World Health Organization. (n.d.). A healthy lifestyle – WHO recommendations. WHO Regional Office for Europe. Retrieved July 5, 2025, from https://www.who.int/europe/news-room/fact-sheets/item/a-healthy-lifestyle—who-recommendations ↩︎
Alumni: University of British Columbia – Gloria Tsang is the author of 6 books and the founder of HealthCastle.com, the largest online nutrition network run by registered dietitians. Her work has appeared in major national publications, and she is a regularly featured nutrition expert for media outlets across the country. The Huffington Post named her one of its Top 20 Nutrition Experts on Twitter. Gloria’s articles have appeared on various media such as Reuters, NBC & ABC affiliates, The Chicago Sun-Times, Reader’s Digest Canada, iVillage and USA Today.
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