Ideal Weight Calculator UK
Our free ideal weight calculator uses the Robinson formula to estimate your healthy body weight range based on your height and sex. This is a widely used clinical tool to give you a clear target for your health journey.
Your Ideal Weight
Healthy Range
62.0kg - 75.8kg
About Robinson Formula
The Robinson formula is one of the most popular ways to estimate ideal body weight for adults. Please note that "ideal" weight is subjective and doesn't account for muscle mass or body composition.
How the Robinson Formula Estimates Ideal Weight
This calculator uses the Robinson Formula (1983) — one of the most widely referenced clinical ideal weight formulas. For men: IBW = 52kg + 1.9kg per inch over 5 feet. For women: IBW = 49kg + 1.7kg per inch over 5 feet. A ±10% healthy range is displayed around the calculated ideal weight. Inputs: height (cm or feet/inches) and sex. Outputs: ideal body weight in kg and lbs, plus the healthy weight range.
Frequently Asked Questions
Is the UK Ideal Weight Calculator based on NHS guidelines?
Yes. Where applicable, our ideal weight calculator uses the standard clinical formulas and reference ranges recommended by the NHS and recognised UK medical bodies. Results are for informational purposes and are not a substitute for medical advice.
How accurate is the Ideal Weight Calculator for UK adults?
Our ideal weight calculator uses validated clinical formulas applied to healthy adults. Accuracy depends on the quality of the inputs provided. For medical diagnoses, treatment plans, or clinical decisions, always consult a qualified UK GP or healthcare professional.
Can I use this Ideal Weight Calculator on my mobile in the UK?
Yes. Our ideal weight calculator is fully optimised for mobile use on any UK smartphone or tablet, including iPhone, Android, and iPad. No app download is required — simply visit CalcMax in your browser.
Does this Ideal Weight Calculator apply to children as well as adults?
Standard formulas used in this calculator are calibrated for adults. Children have different healthy ranges and reference values. For children's health metrics, please consult a UK paediatrician or your child's GP rather than using adult-only calculators.
Is this Ideal Weight Calculator free to use without a sign-up?
Yes. Our ideal weight calculator is completely free to use. No account, registration, or personal details are required. Simply open the tool in your browser and begin calculating immediately on any device.