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 Graph — Track Your Health Progress
A weight graph is one of the most effective ways to visualise your weight management journey and stay motivated towards your health goals. Rather than focusing on daily fluctuations, a weight graph shows your overall trend over weeks and months, helping you understand whether your weight management efforts are working. The NHS recommends tracking weight progress as part of a healthy lifestyle approach, and using tools like a weight graph removes the emotional element of stepping on the scales daily. Whether you're monitoring your weight for general health, managing a health condition, or working with a healthcare professional, keeping a visual record helps you stay accountable and spot patterns in your behaviour.
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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.
Why Weight Graphs Matter for UK Health Goals
Weight naturally fluctuates day-to-day due to water retention, meals, exercise, hormones, and other factors — sometimes by up to 1–2 kg in a single day. This is completely normal and doesn't mean your weight management efforts have failed. A weight graph smooths out these daily variations and reveals your true trend, which is what actually matters for your health. The NHS advises weighing yourself once weekly at the same time of day (ideally in the morning before eating) to get the most accurate picture. When you plot these weekly measurements on a weight graph, you can see the bigger picture: are you losing weight gradually? Maintaining? Moving in a positive direction? Research shows that people who track their weight progress are significantly more likely to achieve their goals and maintain weight loss long-term. A weight graph also helps you identify what's working — if you can see that your weight decreased during weeks when you were more active or eating more nutritiously, you know which behaviours to repeat. Your GP can also review your weight graph during appointments to assess your progress and provide personalised health advice.
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.
Setting Up and Using Your Weight Graph
Starting a weight graph is simple: use our free progress tracker on this page to log your weight weekly, or use a spreadsheet, notebook, or dedicated health app. Record your weight on the same day and time each week for consistency. After 4–6 weeks of data, patterns will start to emerge. A healthy weight management target according to NHS guidance is losing 0.5–1 kg per week — if your graph shows this trend, you're on track. Don't panic about single-week increases; what matters is the overall direction over weeks and months. If you're working with a GP, prescriber, or using weight management support (such as prescription weight loss medication), your weight graph becomes even more valuable — it shows clinically whether treatment is effective for you. Use our free BMI calculator alongside your weight graph to understand how weight changes affect your BMI category and overall health risk. You can also use our weight converter to switch between kg, stone, and pounds depending on how you prefer to track progress.
- 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.
How often should I weigh myself for an accurate weight graph?
The NHS recommends weighing yourself once weekly, ideally on the same day and time (typically Monday morning or similar). Daily weighing can be misleading because weight naturally fluctuates due to water, food, and hormones. Weekly measurements give a more accurate picture of your true trend.
Why does my weight graph show increases some weeks even though I'm trying to lose weight?
Weight naturally varies week-to-week due to water retention, hormones, food intake, and exercise. A single week's increase doesn't mean your efforts have failed. Look at your overall trend over 4–8 weeks — that's what tells the true story of your progress.
What weight loss rate should I expect on my weight graph?
The NHS recommends a safe, sustainable weight loss rate of 0.5–1 kg per week. If your weight graph shows this trend over several weeks, you're on track. Faster loss is possible but should only be attempted under medical supervision.
Should I use kg, stone, or pounds on my weight graph?
Choose whichever unit you're most comfortable with — consistency matters more than which unit you pick. Most UK adults use stone and pounds, but kg is equally valid. Use our weight converter to switch between units whenever you like.
Can my GP help me interpret my weight graph?
Yes — bringing your weight graph to GP appointments is helpful. Your doctor can review your trend, assess whether your weight management approach is working, and provide personalised health advice based on your individual health conditions and 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.