The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Weight and Height Calculator for UK Adults
Finding your healthy weight based on your height is one of the most straightforward ways to assess whether your current weight falls within a safe range for your body. Your height and weight together determine your BMI (body mass index), which the NHS uses as a screening tool for weight-related health risks. In the UK, we measure weight in stone and pounds, and height in feet and inches or centimetres — making it easy to track your personal health metrics. This guide explains how to calculate your healthy weight range and what it means for your overall health and wellbeing.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How to Calculate Healthy Weight From Height
Your healthy weight range depends on your height and is calculated using BMI formulas. The NHS defines a healthy BMI as between 18.5 and 24.9. To find your healthy weight range, multiply your height in metres by itself, then multiply by 18.5 (for the lower limit) and 24.9 (for the upper limit).
For example, if you are 1.73m tall (5ft 8in), your healthy weight range is approximately 55.4kg (8st 10lbs) to 74.5kg (11st 10lbs). Use our free BMI calculator above to find your personal healthy weight range instantly — simply enter your height and weight in either metric or imperial measurements, and the calculator will show your current BMI and healthy weight targets.
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to increased health risks at standard BMI levels. Your GP can provide personalised guidance if you fall into these groups.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Why Height Matters for Weight Management
Height is fundamental to weight management because it directly affects how your body distributes weight and your metabolic needs. Taller individuals naturally weigh more simply because they have more body surface area. This is why generic weight targets are unhelpful — a healthy weight for someone 5ft tall is very different from someone 6ft tall.
Beyond BMI, the NHS also recommends checking your waist circumference as an indicator of health risk. For men, a waist over 94cm (37in) signals increased risk; for women, over 80cm (31.5in). Try our weight converter tool to check your weight in different units (kg, stone, pounds), and track your progress over time with our free progress tracker to monitor both weight and measurements as you work towards your health goals.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What is the formula to calculate healthy weight from height?
The NHS uses BMI (weight in kg ÷ height in metres²). For a healthy BMI of 18.5–24.9, multiply your height squared by 18.5 (lower limit) and 24.9 (upper limit). For example, at 1.70m tall, your healthy weight is roughly 53.5kg to 72kg. Use our free BMI calculator for gradual improvement in your preferred units.
Is my weight healthy for my height?
Your weight is healthy if your BMI falls between 18.5 and 24.9 according to NHS guidelines. However, BMI doesn't account for muscle mass or fat distribution. Check your BMI using our calculator, and discuss your individual health with your GP — they can consider your overall fitness, family history, and any health conditions.
Why do taller people weigh more?
Taller individuals have greater body surface area and more space for organs, bones, and tissues. This is why a healthy weight for a 5ft person differs significantly from someone 6ft tall. Height directly influences metabolic rate and calorie needs, which is why personalised healthy weight ranges are calculated specifically for your height.
What if I'm overweight for my height?
If your BMI is 25–29.9, you're in the overweight range. If it's 30 or above, you're in the obese range. Small reductions in weight (5–10%) can significantly improve health. Your GP can discuss weight management options, including lifestyle changes, structured programmes, or in some cases, prescription medications alongside diet and exercise.
Does healthy weight change with age?
BMI categories remain the same across adulthood, but muscle naturally decreases with age while fat may increase. This means some older adults may need personalised guidance beyond standard BMI ranges. Consult your GP for age-specific health advice, as overall fitness and health conditions matter alongside weight.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.