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 Tracker App — How to Monitor Your Progress
If you're taking Mounjaro (tirzepatide) for weight management, tracking your progress is a practical way to stay motivated and monitor how the medication is working for you. While there isn't an official "Mounjaro app" from the manufacturer, several approaches can help you document your weight loss journey. MyWeightCheck offers a free progress tracker that works alongside your GLP-1 weight loss calculator to help you record weekly weigh-ins, dose information, and how you're responding to treatment. Whether you use a simple spreadsheet, a general fitness app, or our dedicated tracking tool, keeping records helps you and your GP understand your progress over time.
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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.
Tracking Options for Your Mounjaro Journey
There is no official Mounjaro app from Eli Lilly, but several practical tracking methods work well:
- MyWeightCheck Progress Tracker — Our free tool lets you log your weight weekly, record your Mounjaro dose (2.5mg to 15mg), note any side effects, and view your progress visually. It's specifically designed for UK users and works in kg, stone, and lbs.
- General fitness apps — Apps like MyFitnessPal, Lose It!, or Samsung Health have weight logging features and can track weekly trends.
- NHS weight management apps — Free NHS apps such as "Change4Life" or local NHS digital weight management programmes often include progress tracking.
- Simple spreadsheet — A basic Excel or Google Sheets tracker with weekly dates and weight readings is often the most reliable and private option.
- Paper diary — Some users prefer handwritten weekly records alongside their injection schedule notes.
The best tracker is the one you'll actually use consistently. Most people benefit from weekly weigh-ins on the same day at the same time for accuracy.
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.
What to Track Alongside Weight Loss
Weight is just one marker of progress. Consider recording:
- Current Mounjaro dose — Track which dose you're on (starting at 2.5mg and titrating up to 15mg) so you can connect dose changes to any shifts in appetite or side effects.
- Side effects — Note nausea, constipation, or injection site reactions so you can discuss patterns with your GP and know if they improve over time.
- Hunger and cravings — Log subjective appetite changes week-to-week, which often shift during dose escalation.
- Energy levels — Mounjaro can affect energy; tracking this helps you identify patterns.
- Clothes fit and measurements — Weight alone doesn't capture the full picture; waist circumference and how clothes feel matter too.
This wider picture helps your GP or prescriber understand how well Mounjaro is working for you individually.
- 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.
Is there an official Mounjaro tracking app from Eli Lilly?
No. Eli Lilly has not released an official Mounjaro app. However, MyWeightCheck offers a free progress tracker designed for UK weight loss patients, and many general fitness apps (MyFitnessPal, Lose It!) include weight logging. Your NHS weight management service may also provide digital tracking tools.
What's the best way to track my Mounjaro dose changes?
Record your current dose (2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, or 15mg) alongside your weekly weight. Note the date you increased your dose so you can review whether appetite, side effects, or weight loss patterns changed after each escalation. This helps your prescriber optimise your dose.
How often should I weigh myself on Mounjaro?
The NHS recommends weekly weigh-ins on the same day and time for consistency. Weekly tracking shows clearer trends than daily weighing, which fluctuates. Most Mounjaro users find once-weekly tracking motivating and accurate for monitoring real progress.
Should I track side effects in my Mounjaro app?
Yes. Logging when side effects occur (nausea, constipation, injection site reactions) helps you spot patterns and predict when they might improve. It also gives your GP useful information at your next review. Most side effects improve over time as your body adjusts.
Can I use MyWeightCheck's progress tracker with my Mounjaro prescription?
Yes. Our free progress tracker is designed to work alongside Mounjaro, Wegovy, and other weight loss medications. It allows you to log your weight in kg, stone, or lbs, record your current dose, and monitor your weight loss trajectory over weeks and months. Use it together with our GLP-1 weight loss calculator to estimate your expected progress.
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.