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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Weights For A Scale — UK Health Guide
Understanding healthy weights is essential for managing your health in the UK. Weight measured on a scale is just one part of the health picture, but it forms the basis for calculating BMI, assessing health risk, and tracking progress. The NHS provides clear guidelines on healthy weight ranges for UK adults, and this guide explains what the numbers mean, how to interpret them, and what tools can help you understand your personal weight in context. Whether you're converting between stone, pounds, and kilograms, or checking if your weight falls within a healthy range, this guide covers everything you need to know.
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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.
NHS Weight Guidance and Healthy Weight Ranges for UK Adults
The NHS defines healthy weight as a BMI between 18.5 and 24.9 for most UK adults. However, your actual weight depends entirely on your height — two people of the same weight can have very different BMI values if they differ in height. For this reason, the NHS does not recommend specific weight targets but instead focuses on BMI ranges and waist circumference.
- Healthy BMI range (18.5–24.9): Generally associated with lower health risks
- Overweight (25–29.9): Increased risk of type 2 diabetes and heart disease
- Obese (30+): Significant health risks, including cardiovascular disease, type 2 diabetes, and certain cancers
- South Asian, Black African, Caribbean, and Chinese adults: The NHS recommends lower thresholds — healthy BMI is 18.5–22.9, with overweight starting at 23
Use our free BMI calculator above to find your personal BMI and see which category your weight falls into. This gives you more meaningful context than the number on the scale alone.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
UK Tools to Understand Your Weight in Context
A scale only tells you total weight — it doesn't distinguish between muscle, fat, bone, and water. For this reason, NHS guidance emphasises that weight alone is not a complete health picture. Two key tools can help you understand your weight better:
- BMI Calculator: Converts your weight and height into a health-related category, providing context that a number on a scale cannot
- Weight Converter: Converts between kg, stone, and pounds so you can compare your weight across different measurement systems
- Waist Circumference: The NHS also recommends measuring your waist; excess abdominal fat carries higher health risks than weight distributed elsewhere
If you have concerns about your weight and health, your GP can provide personalised advice based on your individual circumstances, medical history, and risk factors.
- 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 weight should I aim for according to the NHS?
The NHS does not recommend a specific target weight but instead focuses on BMI range (18.5–24.9 for most adults) and waist circumference. Your healthy weight depends on your height, age, muscle mass, and individual health factors. Use our BMI calculator to find your personal healthy range based on your height.
How do I convert my weight from pounds to stone?
One stone equals exactly 14 pounds. To convert, divide pounds by 14. For example, 196 pounds = 14 stone. Use our free weight converter above to instantly switch between kg, stone, and pounds — no calculation needed.
Why does the NHS care about waist circumference as well as weight?
Waist measurement indicates where fat is stored. Excess belly fat carries higher health risks than fat stored elsewhere. The NHS recommends: men keep waist under 94cm (37 inches), women under 80cm (31.5 inches). A high waist measurement can indicate health risk even at a healthy BMI.
Is a scale weight of 70kg healthy for everyone?
No — 70kg is healthy or unhealthy depending entirely on your height. At 1.75m (5ft 9in), 70kg gives a BMI of 22.9 (healthy). At 1.60m (5ft 3in), 70kg gives a BMI of 27.3 (overweight). Use the BMI calculator on this page to check your personal context.
Should I weigh myself daily when tracking my weight?
The NHS recommends weighing yourself once a week at the same time of day, as daily fluctuations (due to water, food, and hormones) can be discouraging and misleading. Use our free progress tracker to log weekly weigh-ins and see trends over time rather than daily variations.
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.