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 You Weigh For Your Height?
Your healthy weight depends on your height, age, sex, and body composition — there's no single "perfect" number. According to NHS guidelines, a healthy weight for your height falls within a BMI range of 18.5 to 24.9. However, this is a range rather than a fixed target, and many factors affect what's right for you personally. Use our free BMI calculator above to find your healthy weight range instantly, or read on to explore how your height determines your ideal weight band.
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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.
Healthy Weight Range by Height
The table below shows the healthy weight range for different heights according to NHS guidance. These ranges assume an average body composition and are based on a BMI of 18.5 to 24.9 — the standard healthy range for UK adults.
- 150 cm (4ft 11in): 41–59 kg (6st 6lbs–9st 4lbs)
- 160 cm (5ft 3in): 47–64 kg (7st 5lbs–10st 1lb)
- 165 cm (5ft 5in): 50–69 kg (7st 12lbs–10st 11lbs)
- 170 cm (5ft 7in): 53–76 kg (8st 5lbs–11st 12lbs)
- 175 cm (5ft 9in): 57–82 kg (8st 13lbs–12st 13lbs)
- 180 cm (5ft 11in): 60–89 kg (9st 6lbs–14st 0lbs)
- 185 cm (6ft 1in): 64–96 kg (10st 1lb–15st 2lbs)
- 190 cm (6ft 3in): 68–104 kg (10st 11lbs–16st 5lbs)
Use the weight converter on this page to switch between kg, stone, and pounds instantly. Remember: these are ranges, not targets. Where you fall within your healthy range depends on your individual circumstances.
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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.
Factors That Affect Your Ideal Weight
Your ideal weight is personal and influenced by several factors beyond height. Muscle mass weighs more than fat, so athletic individuals may be heavier than non-athletic people at the same height and still be perfectly healthy. Frame size also matters — larger frames naturally carry more weight. Age, genetics, and ethnicity all play a role. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower BMI thresholds due to higher health risks at lower weights. Rather than chasing a specific number on the scales, focus on how you feel, your energy levels, and what your GP advises based on your health profile.
- 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 NHS healthy weight range?
According to NHS guidance, a healthy BMI is between 18.5 and 24.9. This translates to different weight ranges depending on your height — for example, a healthy range for someone 170cm tall is approximately 53–76 kg (8st 5lbs–11st 12lbs). Use our free BMI calculator to find your personal healthy range.
Does muscle mass affect what you should weigh?
Yes, significantly. Muscle is denser than fat, so athletic or muscular individuals may weigh more than the BMI range suggests while still being very healthy. BMI doesn't distinguish between muscle and fat, which is one of its limitations. If you're very active or strength-train regularly, discuss your weight with your GP rather than relying on BMI alone.
Are healthy weight ranges different for different ethnicities?
Yes. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean backgrounds because these populations face higher risks of type 2 diabetes and heart disease at lower BMI levels. If this applies to you, speak with your GP about your appropriate healthy weight range.
How can I tell if my weight is healthy for my height?
Calculate your BMI using our free BMI calculator on this page — it's the first step. A BMI of 18.5–24.9 is considered healthy for most UK adults. However, BMI is just a screening tool. Your GP can also assess your waist circumference, overall fitness, medical history, and other factors to give you personalised advice about your ideal weight.
What if my weight is outside the healthy range — what should I do?
If your BMI falls outside the healthy range (under 18.5 or over 25), speak with your GP. They can assess your individual circumstances, discuss lifestyle changes like diet and exercise, or refer you to specialist weight management services if appropriate. Weight changes should always be discussed with a healthcare professional first.
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.