health9 min
BMI: What the Numbers Actually Mean (and What They Don't)
BMI categories, edge cases and better measures.
Dr. James Okonkwo
Nutrition & Fitness
Nutrition Calculadora
Every Nutrition calculadora on Calculadora.co.uk — free, fast and built for the UK.
BMI, BMR, daily calories and macros — in metric or imperial, with plain-English context about what the numbers actually mean for your health.
7 calculators in this category · updated weekly
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BMI calculadoraLIVE
BMI
23.5
Healthy weight
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7 tools- OpenBMI calculadora
Check your Body Mass Index in metric or imperial, with NHS weight categories explained.
- OpenBMR calculadora
Estimate your Basal Metabolic Rate — the calories your body burns at rest — with the Mifflin-St Jeor equation.
- body-compositionOpenBody Density calculadora
Estimate body density from the Jackson-Pollock 3-site skinfold sum, then convert to body-fat percentage with the Siri equation.
- OpenIdeal Weight calculadora
Estimate a healthy weight range from height using Devine, Robinson, Miller and Hamwi formulas.
- OpenMacronutrient calculadora
Split your daily calories into protein, carbs and fat in grams, based on your body weight and training goal.
- body-compositionOpenSkinfolds calculadora
Enter your chest/abdomen/thigh or triceps/suprailiac/thigh skinfold readings to get the sum, body density, and body-fat percentage via Jackson-Pollock + Siri.
- OpenTDEE calculadora
Work out Total Daily Energy Expenditure based on BMR and activity level to set a calorie target.
body-composition
2 tools- Body Density calculadora
Estimate body density from the Jackson-Pollock 3-site skinfold sum, then convert to body-fat percentage with the Siri equation.
- Skinfolds calculadora
Enter your chest/abdomen/thigh or triceps/suprailiac/thigh skinfold readings to get the sum, body density, and body-fat percentage via Jackson-Pollock + Siri.
Key terms in this topic
A quick glossary covering the controlled vocabulary we keep consistent across every calculator in this cluster.
- NHS
- Nutrition & Fitness
- British Nutrition Foundation
- ACSM
- body-fat %
- Jackson-Pollock
- Siri equation
- skinfold calipers
- WHO
- Harpenden
Frequently asked questions
BMI formula?
Use the BMI calculadora. Check your Body Mass Index in metric or imperial, with NHS weight categories explained.
BMR formula?
Use the BMR calculadora. Estimate your Basal Metabolic Rate — the calories your body burns at rest — with the Mifflin-St Jeor equation.
Jackson pollock 3 site formula?
Use the Body Density calculadora. Estimate body density from the Jackson-Pollock 3-site skinfold sum, then convert to body-fat percentage with the Siri equation.
Devine formula?
Use the Ideal Weight calculadora. Estimate a healthy weight range from height using Devine, Robinson, Miller and Hamwi formulas.
Protein per kg?
Use the Macronutrient calculadora. Split your daily calories into protein, carbs and fat in grams, based on your body weight and training goal.
Skinfold measurement sites men?
Use the Skinfolds calculadora. Enter your chest/abdomen/thigh or triceps/suprailiac/thigh skinfold readings to get the sum, body density, and body-fat percentage via Jackson-Pollock + Siri.