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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Normal Weight Chart — Understanding Healthy Weight Ranges in the UK
A normal or healthy weight range depends on your height and is determined using BMI (Body Mass Index) as the primary NHS measure. According to NHS guidelines, healthy weight corresponds to a BMI between 18.5 and 24.9 for most UK adults. However, what constitutes an ideal body weight varies significantly from person to person based on factors including age, muscle mass, bone density, and ethnicity. This guide explains how to find your healthy weight range and what the numbers mean for your health using the standard BMI-based framework.
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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 — BMI 18.5 to 24.9
The healthy weight range for any given height is calculated using the BMI formula, which divides weight in kilograms by height in metres squared. For example, an adult who is 1.73m tall (5ft 8in) falls into the healthy weight range if they weigh between approximately 55.4 kg (8 stone 10 lbs) and 74.5 kg (11 stone 10 lbs).
To find your personal healthy weight range for height, you can use our free BMI calculator above, which instantly calculates the weight range that corresponds to a BMI of 18.5–24.9 for your exact height. The healthy weight range in kg and stone varies considerably:
- For 160cm (5ft 3in): 47–63 kg (7st 5lbs to 9st 13lbs)
- For 170cm (5ft 7in): 53–71 kg (8st 5lbs to 11st 3lbs)
- For 180cm (5ft 11in): 60–80 kg (9st 6lbs to 12st 8lbs)
- For 190cm (6ft 3in): 67–89 kg (10st 7lbs to 14st 0lbs)
It's important to note that BMI is a screening tool only—it does not account for muscle mass, bone density, or where fat is stored on the body. Two people with the same BMI may look and feel very different depending on their body composition.
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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.
Using the BMI Calculator for Your Personalised Health Range
Rather than trying to match a generic weight chart, your own healthy weight range should be calculated based on your specific height using the NHS BMI framework. Our free BMI calculator allows you to enter your height and instantly see the weight range that corresponds to healthy weight (BMI 18.5–24.9) in both metric and imperial units. You can also input your current weight to see where you fall on the healthy weight spectrum.
If you're concerned about your current weight or unsure whether you fall within a normal weight range, speaking with your GP is the best starting point. They can assess your individual health, discuss any weight-related health conditions, and provide personalised guidance. Weight management is not about reaching a single "ideal" number—it's about achieving and maintaining a weight that supports your overall health and wellbeing.
- 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 normal weight range for a woman who is 5ft 5in tall?
A woman who is 5ft 5in (165cm) falls into the healthy weight range if her BMI is between 18.5 and 24.9, which corresponds to approximately 50–67 kg (7st 12lbs to 10st 7lbs). However, individual factors like muscle mass and bone density mean this is a guide rather than a precise target. Use our BMI calculator above to see your exact healthy range.
Does normal weight mean the same thing for all ethnic backgrounds?
No. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage due to higher cardiovascular and diabetes risk at lower BMI levels. For these groups, healthy weight typically corresponds to a BMI of 18.5–22.9 rather than 18.5–24.9. Your GP can discuss the most appropriate thresholds for you.
How do I know if my weight is normal for my height?
Calculate your BMI using our free BMI calculator on this page, or ask your GP to calculate it. If your BMI falls between 18.5 and 24.9, you're in the healthy weight range. Remember that BMI is just one measure and doesn't account for muscle mass or overall fitness. A more complete picture considers waist circumference and general health as well.
Is it unhealthy to be above the normal weight range?
Being above the healthy weight range (BMI 25–29.9 is classed as overweight; 30+ as obese) is associated with increased risk of type 2 diabetes, heart disease, and other health conditions. However, health is complex and influenced by many factors. If you're concerned about your weight, speak with your GP who can assess your individual circumstances and health status.
What's the difference between ideal weight and healthy weight range?
Ideal weight suggests a single target number, whereas the healthy weight range (BMI 18.5–24.9) is a broader band that accounts for natural variation in body composition, muscle mass, and frame size. The healthy weight range is more realistic and flexible than pursuing one "ideal" number. Many weight loss calculators can help project realistic targets aligned with this range.
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.