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
Free tracker included with every download this week
What's the Right Weight For My Height?
The right weight for your height depends on several factors, including your age, muscle mass, and overall health. According to NHS guidance, a healthy weight is determined by your BMI (body mass index) rather than a single number on the scales. Using UK health information and evidence-based thresholds, you can find the healthy weight range for your specific height and build. Our free BMI calculator above will help you determine whether your current weight falls within the recommended range, and our weight converter makes it easy to check your weight in stone, pounds, or kilograms.
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.
NHS Healthy Weight Ranges by Height
The NHS defines a healthy BMI between 18.5 and 24.9, which corresponds to different weight ranges depending on your height. For example, an adult who is 5ft 8in (173cm) tall has a healthy weight range of approximately 55–74kg (8st 8lbs to 11st 8lbs). For someone 5ft 4in (163cm), the healthy range is roughly 50–67kg (7st 12lbs to 10st 7lbs).
However, for adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds. A healthy BMI for these groups starts at 18.5 but extends only to 22.9, reflecting higher health risks at lower weights. Your individual right weight also depends on muscle mass, bone density, and personal health conditions — which is why consulting your GP about weight management is always wise.
- Healthy BMI: 18.5–24.9 (or 18.5–22.9 for certain ethnic groups)
- Your weight converter can instantly show your weight in stone, lbs, or kg
- BMI is a screening tool — it doesn't account for muscle or where fat is stored
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Finding Your Healthy Weight Range
To find your personal healthy weight range, you need your height and a BMI target. A healthy weight for your height ranges from a BMI of 18.5 to 24.9. Use the free BMI calculator on this page to input your height and weight instantly — it will tell you whether you're in the healthy range and show you the upper and lower bounds for your height.
If your current weight is outside the healthy range, even a 5–10% reduction can bring meaningful health benefits including lower blood pressure, improved blood sugar control, and reduced joint strain. Your GP can provide personalised advice tailored to your medical history and can discuss weight management strategies, including lifestyle changes or, if appropriate, further support through NHS weight management services.
- 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 ideal weight for my height in the UK?
There is no single "ideal" weight — instead, the NHS recommends aiming for a BMI between 18.5 and 24.9. Use our free BMI calculator to find your healthy weight range for your specific height. For example, at 5ft 8in, a healthy weight range is roughly 55–74kg (8st 8lbs to 11st 8lbs).
How do I convert my weight to stone to check if it's healthy?
Use our free weight converter above to instantly convert between kg, stone, and pounds. For example, 70kg equals 11 stone and 0.1 lbs. Once you've converted your weight, use the BMI calculator to check whether it falls within the healthy range for your height.
Is BMI the only way to assess if my weight is healthy?
BMI is a useful screening tool recommended by the NHS, but it has limitations — it doesn't distinguish between muscle and fat, and doesn't account for where fat is stored. Your GP can assess your overall health, measure waist circumference, and consider your medical history to give you personalised guidance.
Should I aim for the lower or upper end of the healthy weight range?
The healthy BMI range (18.5–24.9) suits most adults, but your ideal weight depends on your individual factors like muscle mass, age, and health conditions. Discuss with your GP which end of the range is most appropriate for you — both ends are considered healthy by NHS standards.
What should I do if my weight is outside the healthy range?
Start by speaking with your GP, who can assess your health and discuss weight management options. The NHS provides tier 1 self-help resources, tier 2 community programmes, and tier 3 specialist services depending on your needs. Even a 5–10% weight reduction brings real health benefits.
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.