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 Table According to Height and Age — UK Guide
There's no single "ideal" weight that applies to everyone at a given height and age — healthy weight depends on factors like muscle mass, bone density, and individual health. However, NHS guidance provides healthy weight ranges based on height using BMI (Body Mass Index), which applies to most UK adults aged 18–65. We'll show you how to find your healthy weight range and explain why age and body composition matter more than a single target number.
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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.
UK Healthy Weight Ranges by Height
The NHS uses BMI (Body Mass Index) to define healthy weight ranges. A BMI between 18.5 and 24.9 is considered healthy for most UK adults. You can calculate your healthy weight range for any height using this formula: multiply your height in metres by itself, then multiply by 18.5 and 24.9 to get the lower and upper healthy weight bounds in kilograms.
Here are healthy weight ranges for common UK heights (using metric and imperial measurements):
- 5ft 3in (160cm): 47–63 kg (7st 6lbs–9st 13lbs)
- 5ft 6in (168cm): 52–70 kg (8st 2lbs–11st 0lbs)
- 5ft 9in (175cm): 56–76 kg (8st 12lbs–11st 13lbs)
- 5ft 11in (180cm): 60–81 kg (9st 6lbs–12st 11lbs)
Use our free weight converter to switch between kg, stone, and pounds instantly. These ranges apply to adults aged 18–65 with typical body composition; athletes or highly muscular individuals may have a higher healthy weight.
Clinically BackedWeight Loss
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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.
Age, Body Composition, and Individual Variation
Weight recommendations don't change significantly with age — a 30-year-old and a 60-year-old of the same height and BMI have similar health risk profiles according to NHS guidance. However, how you carry your weight matters more than the number on the scales. Waist circumference is a better predictor of health risk than weight alone: men should aim for under 94cm (37in), and women under 80cm (31.5in).
Age does affect metabolism, muscle mass naturally declines with age (sarcopenia), and body composition changes — so two people at the same weight may have very different proportions of muscle versus fat. Try our free BMI calculator to find your personal healthy weight range and understand what a healthy BMI means for your height.
- 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 for older adults (65+)?
Not officially — NHS BMI categories remain the same for adults over 65. However, older adults lose muscle mass naturally, so a higher weight at the same BMI may include more fat. Your GP can assess whether your weight is healthy for your individual circumstances, considering muscle mass and overall health.
Why does the table show a range rather than a single ideal weight?
Healthy weight is a range because people have different bone density, muscle mass, and frame size. Two people at 5ft 8in may both be healthy at different weights depending on whether they're athletic or sedentary. BMI provides a useful screening range; your GP can personalise advice further.
Does this weight table apply to pregnant women?
No — BMI categories do not apply during pregnancy. The NHS recommends pregnant women focus on appropriate weight gain rather than targeting a BMI range. Speak to your midwife or GP about healthy weight gain during pregnancy specific to your circumstances.
What if my weight is in the healthy range but I feel unhealthy?
Weight is just one health marker. Even at a healthy BMI, factors like fitness level, diet quality, stress, sleep, and medical conditions affect health. Your GP can assess your overall health picture, not just your weight. Consider booking a health check with your practice.
Can I use this table to set a weight loss goal?
Yes — use the healthy weight range for your height as a starting point. If you're currently above this range, aiming for the upper end (BMI 24.9) is a realistic first goal. Aim to lose 0.5–1 kg per week for sustainable results. Your GP or a specialist weight management service can help you set personalised goals.
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.