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 Weekly Tracker: How to Monitor Your Progress
Tracking your weight loss weekly is an effective way to stay motivated and identify patterns in your weight management uk journey. Whether you're following a reduced-calorie diet, increasing physical activity, or considering prescription weight loss medication, consistent weekly tracking helps you understand what's working. The NHS recommends a sustainable weight loss rate of 0.5 to 1 kg per week. This guide covers how to track effectively, what to expect, and the prescription weight loss options available to eligible adults in the UK.
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.
UK-Licensed Weight Loss Medication Options
For adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, prescription weight loss medications are available in the UK. Three medications are currently licensed for weight management:
- Mounjaro (tirzepatide) — a dual GIP/GLP-1 receptor agonist. Clinical trials showed average weight loss of approximately 15–21% body weight over 72 weeks at the maximum 15 mg dose, alongside diet and exercise.
- Wegovy (semaglutide) — a GLP-1 receptor agonist. STEP-1 trial data showed average weight loss of approximately 14.9% body weight at 68 weeks on the maximum 2.4 mg dose.
- Saxenda (liraglutide) — a once-daily GLP-1 injection. Average weight loss is typically 5–10% body weight over 52 weeks.
Individual results vary significantly. All three are prescription-only and require a clinical assessment before being prescribed. Your GP can discuss which option, if any, may be appropriate for your circumstances.
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.
NHS vs Private Access — How to Get Started
NHS access: Weight loss medication is available through NHS specialist tier 3 weight management services. You'll need a GP referral. Availability varies significantly by region, and waiting lists can be lengthy. Contact your GP practice to ask about local specialist services.
Private access: Available through GPhC-registered online prescribers following a clinical assessment. This route doesn't require NHS referral and can be faster. Always ensure the prescriber is UK-licensed.
Your weekly tracker becomes more powerful when combined with professional support. Whether you choose NHS or private care, consistent weekly monitoring helps you and your healthcare provider assess whether your chosen approach is working and make adjustments if needed.
- 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 should I record in my weekly weight loss tracker?
Record your weight at the same day and time each week (typically a Monday morning). Note any significant factors affecting that week: diet changes, medication dose changes, illness, or increased exercise. Weight naturally fluctuates 1–2 kg daily due to water retention, hormones, and food intake. Weekly tracking smooths these fluctuations and shows true progress.
How quickly should I expect to lose weight with prescription medication?
The NHS recommends sustainable weight loss of 0.5–1 kg per week. With prescription GLP-1 medication like Mounjaro or Wegovy, clinical trials show average weight loss of 15–21% body weight over several months, though individual results vary significantly. Your weekly tracker will show when you reach a stable pattern, typically weeks 4–8 into treatment.
Can I use a weight tracker alongside GLP-1 medication?
Yes. In fact, tracking your weight weekly while using glp-1 weight loss medication helps you monitor effectiveness and identify any side effects affecting appetite or digestion. Use our free progress tracker on this page to log weekly results and spot patterns. Share your tracking data with your GP or prescriber at follow-up appointments.
What's the difference between daily and weekly weigh-ins?
Daily weigh-ins can be demoralising because weight fluctuates naturally by 1–2 kg due to water, food, and hormones. Weekly weigh-ins at the same time give a clearer picture of actual fat loss. The NHS recommends weekly weigh-ins as part of weight management uk programmes for this reason. Monthly tracking can miss important changes.
What should I do if my weekly weight loss stops?
A plateau is normal and usually temporary. It can last 1–3 weeks. Ensure you're maintaining a calorie deficit through diet and activity. If you're on prescription medication, discuss the plateau with your GP or prescriber—dose adjustments or lifestyle tweaks may help. Use our BMI calculator and weight converter to track changes in proportion to your health range, not just the number.
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.