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 Charts โ How to Track Your Progress
Weight loss charts help you monitor your journey and stay motivated, showing whether you're losing weight at a healthy, sustainable rate. In the UK, the NHS recommends losing weight gradually at around 0.5 to 1 kg per week for best results. Understanding how to read and use weight loss charts, alongside knowing your BMI and healthy weight management options, gives you a clear picture of your progress. Whether you're managing weight through lifestyle changes, prescription weight loss medication, or a combination of approaches, tracking your weight over time is one of the most effective ways to stay accountable and understand what's working for you.
10,000+ calculations today ยท NHS-aligned thresholds ยท 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/mยฒ).
While BMI isn't a perfect measure โ it doesn't account for muscle mass, bone density, or fat distribution โ 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 โ 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.
Understanding Safe Weight Loss Rates and Charts
A weight loss chart plots your weight over time, allowing you to see trends rather than focusing on daily fluctuations. The NHS recommends losing weight at a sustainable rate of 0.5 to 1 kg (1 to 2 lbs) per week โ anything faster risks losing muscle mass alongside fat and may be harder to maintain long-term.
When creating your own weight loss chart, plot your weight weekly (same day and time each week is most accurate). Your chart should show:
- Starting weight โ your baseline before beginning any weight loss programme
- Goal weight โ based on a healthy BMI range for your height (18.5 to 24.9 BMI)
- Target line โ showing expected progress at 0.5โ1 kg per week
- Actual weekly weight โ plotted as you progress
Use our free BMI calculator to determine your healthy weight range for your height, then work backwards to set a realistic goal. Our free weight converter makes it easy to track in stone, kilograms, or pounds โ whichever you prefer.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care โ 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 โ 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 โ completely free.
Using Weight Loss Charts with Prescription Medication
If you're using prescription weight loss medication such as GLP-1 injections (like Wegovy or Mounjaro), your chart becomes even more valuable. Clinical trials show these medications may help with weight loss when combined with lifestyle changes โ your chart will show whether you're experiencing the expected effects.
With GLP-1 weight loss medication, many people see initial weight loss within the first 4 weeks, with continued loss over 16โ20 weeks of treatment. Your chart helps you and your prescriber monitor response. Our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses, giving you realistic expectations alongside your tracking chart. Remember: individual results vary significantly, and weight loss charts show your unique journey โ not a assures.
- 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 โ 5mg โ 7.5mg โ 10mg โ 12.5mg โ 15mg
- GLP-1 receptor agonist
- Up to 15โ17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg โ 0.5mg โ 1mg โ 1.7mg โ 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 | 15โ22.5% | 12โ17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20โ32 weeks | 16โ20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | ยฃ150โยฃ250/month | ยฃ150โยฃ300/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 โ 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 and record on a weight loss chart?
Weigh yourself once per week, ideally on the same day and time each week (such as Monday morning). Daily weighing shows natural fluctuations (water, food) that can be discouraging. Weekly measurements reveal true progress trends. Record your weight immediately โ whether it's up or down โ to avoid bias.
What is a healthy weight loss rate shown on charts?
The NHS recommends 0.5 to 1 kg (1 to 2 lbs) per week as a healthy, sustainable rate. This means losing roughly 2 to 4 kg per month. Faster loss is possible under medical supervision but increases the risk of muscle loss and is harder to maintain. Slower loss is perfectly acceptable and often more sustainable long-term.
Should my weight loss chart be perfectly linear?
No โ weight loss is rarely a straight line downward. Expect plateaus, small increases, and weekly variations from water retention, hormones, and food timing. A good chart shows the overall downward trend over weeks, not day-to-day changes. If you see no progress over 4โ6 weeks despite effort, discuss with your GP or prescriber.
How do I set a realistic goal weight using a weight loss chart?
Calculate your healthy BMI range using our free BMI calculator. For most adults, a healthy BMI is 18.5 to 24.9. For South Asian, Chinese, Black African, or Caribbean backgrounds, lower thresholds apply (18.5 to 22.9). Set your goal at the upper end of your healthy range initially โ it's more achievable and healthier long-term.
Can I use weight loss charts with NHS weight management services?
Yes โ in fact, NHS specialist weight management services often ask patients to keep weight records. These services may include prescription medication, behaviour support, and exercise advice. Your chart provides valuable data for your healthcare team to assess your response to treatment and adjust your plan if needed.
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.