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
Free Weight Loss Chart for UK Adults
A weight loss chart helps you track progress, set realistic goals, and stay motivated during your weight management journey. Whether you're using lifestyle changes, prescription weight loss medication like Mounjaro or Wegovy, or working with your GP, a visual chart makes it easier to see improvements over weeks and months. Our free weight loss chart resource shows healthy weight ranges by height, typical weight loss timelines, and how to monitor your progress safely.
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.
What Should Be on Your Weight Loss Chart?
A practical weight loss chart should include your starting weight, target weight, and current height to calculate your BMI range. Record weekly or monthly weights to spot trends rather than daily fluctuations. Include columns for date, weight in kg and stone, and BMI so you can see how both measurements change. Add a notes column for lifestyle factors—diet changes, exercise, sleep, or how you're feeling—because weight loss isn't just about the number on the scales.
- Healthy weight range based on your height and NHS BMI guidelines
- Weekly or monthly progress tracking with dates
- Body measurements (waist, chest, hips) as fat loss doesn't always show immediately on scales
- Notes on diet, activity level, and overall wellbeing
- Visual progress markers—how clothes fit, energy levels, or health improvements
You can use our free BMI calculator above to work out your personal healthy weight range, then use our progress tracker to log your actual results over time.
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.
Realistic Weight Loss Timelines and Goals
The NHS recommends losing 0.5 to 1 kg (1 to 2 lbs) per week as a safe, sustainable rate. This typically requires a calorie deficit of around 500 kcal per day through diet and exercise combined. Clinical trials of prescription weight loss injections show average results of 15–clinically studied weight loss over several months when used alongside diet and activity changes, though individual results vary significantly.
Your chart should reflect realistic milestones—not expecting 10 kg loss in a month, but celebrating 2–3 kg monthly progress. If you're using prescription weight loss medication, your weight loss may progress faster initially, then stabilise. Always consult your GP if weight loss seems too rapid or too slow for your circumstances.
- 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 weight loss and fat loss on a chart?
Weight includes muscle, water, and fat. A comprehensive chart tracks both weight and body measurements (waist, hips, chest) because you may lose fat while gaining muscle, so scales alone don't tell the full story. Progress tracker tools help you log both metrics over time.
Can I use a weight loss chart if I'm taking Mounjaro or Wegovy?
Yes. Record your starting weight, dose, and weekly weights to see how prescription GLP-1 medication affects your progress. Include notes on any side effects or appetite changes. Your prescriber may also ask for regular weight records during treatment.
How often should I weigh myself and update my chart?
Once weekly on the same day and time (morning, after toilet, before food) is ideal. Daily weighing can be demoralising due to water retention and natural fluctuations. Weekly updates show genuine trends without the noise of daily variation.
What if my weight loss plateaus—should I change my chart?
No—keep recording. Weight loss plateaus are normal and usually temporary. A chart showing a plateau helps your GP identify whether you need lifestyle adjustments, medication changes, or simply patience. Continuing to log data shows you're still engaged with your goals.
Is there an NHS-recommended weight loss chart I can use?
The NHS doesn't provide a standard chart, but our free BMI calculator and progress tracker on this page help you establish your healthy weight range and log progress. Your GP practice may also provide paper or digital charts during weight management consultations.
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.