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 Should I Weigh For My Height?
There's no single "perfect" weight for your height — but there is a healthy weight range based on your height and body composition. The NHS uses BMI (Body Mass Index) to define what counts as a healthy weight for your height, alongside other measurements like waist circumference. This guide explains how to find your ideal weight range and what it means for your health. Use our free BMI calculator above to discover your personal healthy weight range in seconds.
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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 Find Your Healthy Weight Range
Your healthy weight range depends on your height. The NHS defines a healthy BMI as between 18.5 and 24.9, which translates to a specific weight range for each height.
To calculate your range, you need your height in centimetres or feet and inches. For example, at 5ft 8in (173cm), a healthy weight is roughly 55–73kg (8st 8lbs to 11st 6lbs). At 5ft 4in (163cm), healthy weight is approximately 49–65kg (7st 10lbs to 10st 3lbs).
Use our free BMI calculator above to find your exact healthy weight range instantly. The calculator shows you:
- Your current BMI category (underweight, healthy, overweight, obese)
- Your healthy weight range for your height
- How your weight compares to NHS guidelines
- Context for your individual health
Remember: healthy weight isn't just about a number — it's about your overall fitness, muscle mass, and health markers like blood pressure and cholesterol.
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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.
What If You're Above Your Healthy Weight Range?
If your weight is above the healthy range for your height, you're not alone — around 63% of UK adults are overweight or obese. The good news is that even modest weight loss brings real health benefits. Losing just 5–10% of your body weight can improve blood pressure, blood sugar control, joint pain, and sleep quality.
If you'd like to lose weight, start with small, sustainable changes: reduce portion sizes, add more vegetables, increase daily activity, and stay hydrated. The NHS recommends losing 0.5–1kg per week for safe, lasting results. If you're struggling, talk to your GP about support options. Our free progress tracker can help you log your journey and stay motivated over time.
- 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.
Is there a different healthy weight range for different body types?
Yes, frame size and muscle mass affect ideal weight. The NHS BMI range (18.5–24.9) is a screening tool, not a rigid target. People with more muscle (athletes, for example) may have a higher BMI but lower body fat. Your GP can give you personalised guidance based on your health profile, not just a number.
Does my ethnicity affect what's a healthy weight for my height?
Yes. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage, because these groups face higher health risks at lower BMI levels. A healthy BMI for these groups is 18.5–22.9 rather than 18.5–24.9. Discuss this with your GP if it applies to you.
What's the difference between BMI and ideal body weight?
BMI is a screening tool based on height and weight only — it doesn't account for muscle, bone density, or where fat is stored. "Ideal body weight" formulas (like the Devine formula) estimate a target based on height alone but vary widely. Your GP can help you set a realistic, health-focused goal rather than chasing a single number.
How do I convert my healthy weight range to stone and pounds?
Use our free weight converter on this page to switch between kilograms, stone, and pounds instantly. For example, 70kg converts to 11 stone exactly. If your healthy range is 55–73kg, that's approximately 8st 8lbs to 11st 6lbs in UK measurements.
Should I try to reach the lower or upper end of my healthy weight range?
The healthy range gives you flexibility based on your body composition, fitness level, and how you feel. Aim for the range rather than a specific number. If you're very muscular, the upper end may be appropriate. If you have health concerns like high blood pressure, aiming toward the lower end might benefit you. Your GP can advise. ```
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.