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
Mounjaro Weight Loss Tracker — Monitor Your Progress
Tracking your weight loss progress while taking Mounjaro (tirzepatide) helps you stay motivated and understand how the prescription injection is working for you. A weight loss tracker is especially useful for Mounjaro because the medication works gradually over weeks and months—many people don't see significant changes week-to-week, but tracking creates a clear picture of your overall progress. MyWeightCheck offers a free progress tracker designed for UK adults managing weight with prescription medications like Mounjaro. You can log your weight regularly, watch your BMI shift, and review your journey alongside dose increases as you titrate through the 2.5 mg starting dose up to the 15 mg maximum dose.
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.
Why Track Your Mounjaro Progress?
Mounjaro is a once-weekly GIP and GLP-1 receptor agonist injection that supports appetite control and may help you lose weight alongside a reduced-calorie diet and increased physical activity. Clinical trials showed that people using Mounjaro lost an average of 15–21% of their body weight over 72 weeks—but individual results vary significantly, and progress isn't always steady week-to-week.
A weight loss tracker helps you:
- Monitor subtle weekly changes that add up over months
- Spot patterns and trends in your weight loss journey
- Stay motivated by seeing real progress logged over time
- Track alongside your Mounjaro dose titration (starting at 2.5 mg and increasing every 4 weeks)
- Calculate your BMI at each milestone using our free BMI calculator to understand your progress against NHS healthy weight guidelines
- Identify any weeks where weight stabilises (common and normal on Mounjaro)
Unlike a simple bathroom scale, a structured tracker turns weekly numbers into a clear health picture you can share with your GP if needed.
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.
How to Use a Weight Loss Tracker with Mounjaro
Start by logging your beginning weight and height—this calculates your starting BMI and gives you a baseline for comparison. Then, log your weight once or twice per week at the same time of day (many people choose Monday mornings). A tracker records the date and weight, automatically calculating the weekly change and cumulative loss.
Use our free progress tracker on this page to log alongside your Mounjaro prescription journey. As you move through dose increases—from 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, to the 15 mg weekly injection—you can add notes about how you're feeling and any side effects, helping you and your prescriber understand how the medication is working for you. Converting your weight between kg, stone, and lbs is built into our weight converter tool, so tracking in whichever unit feels most natural to you.
- 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 much weight can I expect to lose on Mounjaro?
Clinical trials showed people lost an average of 15–21% of their body weight over 72 weeks on Mounjaro at various doses. However, individual results vary significantly depending on your starting weight, diet, exercise, genetics, and how your body responds to tirzepatide. Your GP or prescriber can give you a personalised estimate based on your health profile.
When should I start seeing weight loss results on Mounjaro?
Many people notice the first subtle changes between weeks 4–8, though some don't see significant loss until weeks 12–16. Mounjaro works gradually, and weight loss acceleration often happens after dose increases. Tracking weekly helps you spot gradual progress that might not feel obvious on the scales.
Why does my weight stay the same some weeks on Mounjaro?
Weight fluctuates naturally due to water retention, hormones, gut contents, and sodium intake—this is normal even when losing weight steadily. A tracker smooths out these weekly fluctuations and shows the true trend over 4–8 weeks. If weight plateaus for 4+ weeks, discuss this with your GP or prescriber.
Can I use a weight loss tracker if I'm on the NHS Mounjaro pathway?
Yes. Tracking your own weight complements NHS tier 3 specialist services. Your specialist team may track your progress at clinic appointments, but a personal tracker helps you stay engaged between visits and provides data to discuss with your healthcare team.
What's the difference between tracking Mounjaro and Wegovy weight loss?
Both are once-weekly injections with similar tracking principles. Mounjaro is a dual GIP + GLP-1 agonist (doses up to 15 mg), while Wegovy is a GLP-1 agonist only (doses up to 2.4 mg). Average weight loss is slightly higher with Mounjaro in trials, but both require prescription and clinical assessment. Track the same way regardless—use our free progress tracker above.
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.