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
Weight Loss Visualizer — Track Your Progress Across Measurements
A weight loss visualizer helps you understand your progress by showing weight loss in the units that matter to you — whether that's stone, kilograms, or pounds. Whether you're managing weight through lifestyle changes, prescription weight loss injections, or NHS weight management services, seeing your progress across different measurements can make your goals feel more tangible and motivating. MyWeightCheck provides free tools to help you track and visualise your weight management journey in the way that makes most sense for you.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
How a Weight Loss Visualizer Works for UK Weight Management
A weight loss visualizer translates your weight loss into the measurements you use every day. In the UK, we measure body weight in stone and pounds, but clinical assessments often use kilograms. A good visualizer converts between these seamlessly, so you can see that losing 5kg is the same as losing 0st 11lbs — which often feels more significant when you see it in stone.
- Track progress in real numbers: See exact weight at any point, not just "I've lost some weight"
- Understand your BMI movement: Watch how your weight loss affects your BMI category as you progress
- Compare different starting points: If you're starting at 85kg, visualise what 75kg, 70kg, or your target weight actually looks like in stone
- Monitor weekly or monthly changes: Small weekly losses (0.5–1kg) are easier to see with a visual tool than numbers alone
For people using GLP-1 weight loss medication like Wegovy or Mounjaro, a visualizer helps set realistic expectations based on clinical trial data — these showed average weight loss of 15–21% of body weight, though individual results vary significantly. Try our free GLP-1 weight loss calculator to estimate potential weight loss at different doses, combined with our weight converter to see progress in your preferred units.
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.
Using a Weight Loss Visualizer with NHS and Private Weight Management
Whether you're accessing weight management through the NHS or privately, a visualizer helps you stay motivated by making progress visible. The NHS recommends losing weight at a sustainable rate of 0.5–1kg per week, and a visualizer makes this steady progress clear week-by-week.
Our free BMI calculator shows how weight changes affect your BMI category — moving from the obese range into the overweight range, or from overweight into the healthy weight range, is a genuine health milestone. Use our weight converter to switch between stone, kg, and lbs as you progress, and track your journey over time with our free progress tracker. For prescription weight loss medication users, a visualizer combined with our GLP-1 weight loss calculator helps you set realistic expectations and monitor real-world results against clinical trial averages.
- 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's the difference between a weight loss visualizer and a regular weight tracker?
A weight loss visualizer shows how weight loss translates across different measurements (stone, kg, lbs) and helps you see progress against health targets like BMI ranges. A regular tracker just logs numbers. A visualizer makes weight change meaningful — seeing "5kg loss" as "0st 11lbs loss" often feels more motivating. Our free BMI calculator and weight converter work together to give you this complete picture.
Can a weight loss visualizer predict how much weight I'll lose on Wegovy or Mounjaro?
Not exactly — individual results vary significantly. Clinical trials (STEP for Wegovy, SURMOUNT for Mounjaro) showed average weight loss of around 15–21%, but your personal outcome depends on your starting weight, dose, lifestyle changes, and how your body responds. Our GLP-1 weight loss calculator shows trial averages and projected ranges, but it's not a assures. Always discuss realistic expectations with your prescriber.
Is losing 0.5–1kg per week realistic if I'm using weight loss medication?
Yes — the NHS recommends losing 0.5–1kg (1–2lbs) per week as a safe, sustainable rate, and this applies whether or not you're using medication. Some people lose faster initially, then the rate slows. A visualizer helps you see that steady weekly losses add up to meaningful progress. For prescription weight loss injections, follow your prescriber's guidance on monitoring your progress.
How does my weight in stone relate to my BMI and health risk?
Your weight in stone alone doesn't determine health risk — it's the combination of your weight, height, and where fat is stored. Our free BMI calculator shows you exactly where your weight puts you in the NHS categories (healthy, overweight, obese). Two people at the same weight in stone can have different BMIs if they're different heights. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS uses lower BMI thresholds due to higher health risk at the same weight.
Why should I use a weight loss visualizer alongside lifestyle changes?
A visualizer keeps you motivated by making progress visible and tangible, especially when lifestyle change takes time to show results. Whether you're reducing calorie intake, increasing activity, or using prescription weight management medication, seeing progress in measurements you understand (stone and pounds for UK adults) reinforces that your efforts are working. Our progress tracker helps you log weight over time and see your trend.
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.