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
How Much Should Be My Weight For My Height?
Your ideal weight depends on your height, age, and body composition — not just a single number. According to NHS guidelines, a healthy weight range is determined by your BMI (Body Mass Index), which falls between 18.5 and 24.9. Use our free BMI calculator above to find your personal healthy weight range instantly, or read on to discover what the NHS recommends for your height in both kilograms and stone.
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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 Ranges by Height (UK BMI 18.5–24.9)
Your healthy weight range is calculated using your height and a BMI of 18.5–24.9 according to NHS guidelines. Below is a reference table showing healthy weight ranges for common UK heights:
- 5ft 0in (152cm): 45–59kg (7st 1lb–9st 4lb)
- 5ft 2in (157cm): 49–64kg (7st 10lb–10st 1lb)
- 5ft 4in (163cm): 52–68kg (8st 2lb–10st 10lb)
- 5ft 6in (168cm): 55–73kg (8st 9lb–11st 6lb)
- 5ft 8in (173cm): 59–78kg (9st 4lb–12st 3lb)
- 5ft 10in (178cm): 63–83kg (9st 13lb–13st 1lb)
- 6ft 0in (183cm): 67–88kg (10st 8lb–13st 12lb)
- 6ft 2in (188cm): 71–94kg (11st 2lb–14st 11lb)
Remember, these are ranges, not fixed targets. Your ideal weight within this range depends on your individual frame size and muscle mass.
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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 healthy weight isn't determined by height alone. Muscle mass, bone density, age, and ethnicity all play a role in determining what's truly healthy for you personally. Someone with significant muscle mass may fall outside the BMI range but be perfectly healthy, whilst the NHS also recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, or Black Caribbean heritage due to higher health risks at lower weights. Age affects metabolism — metabolic rate typically declines with age. Use the weight converter on this page to check your weight in different units, and remember that sustainable health involves overall fitness, diet quality, and wellbeing — not just a number on the scales.
- 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 BMI range is considered healthy by the NHS?
The NHS defines a healthy BMI as 18.5 to 24.9 for most adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the healthy range is lower: 18.5 to 22.9. You can calculate your personal BMI using our free BMI calculator on this page.
Is there a single "ideal" weight for my height?
No. Healthy weight exists as a range based on your BMI, not a single number. Within that range, your ideal weight depends on your muscle mass, bone density, frame size, and individual health. Your GP can advise on what's appropriate for you personally.
Can I be overweight by BMI but still healthy?
Yes, in some cases. Athletes and people with significant muscle mass may have a higher BMI but lower body fat. However, for most people, a BMI above 25 increases health risks. If you're unsure, discuss your individual health with your GP.
Do men and women have different healthy weight ranges?
Not officially — NHS BMI categories are the same for all adults. However, women and men naturally have different average muscle mass and fat distribution, so two people at the same height and weight may have different body compositions.
What's the difference between healthy weight and ideal weight?
Healthy weight refers to a weight range (BMI 18.5–24.9) associated with lower health risks. Ideal weight is more personal — it's the weight at which you feel energised, healthy, and able to maintain sustainable habits. These may be slightly different for each person.
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.