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 Tracker App — How to Track Your Progress
A weight loss tracker app helps you monitor your weight management journey by recording daily weigh-ins, tracking progress towards goals, and keeping you motivated. Whether you're losing weight through lifestyle changes, prescription medication like GLP-1 injections, or a combination of both, tracking your progress is one of the most effective ways to stay accountable. MyWeightCheck offers a free progress tracker designed specifically for UK adults, helping you see real results over time and understand what's working for your weight management plan.
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 Weight Tracking Matters for Your Weight Loss Success
Research shows that people who track their weight loss are significantly more likely to achieve their goals. A weight loss tracker app provides several key benefits: it creates accountability, helps you identify patterns (such as which weeks show the best results), and gives you visual proof of progress—which is especially motivating during plateaus. If you're using prescription weight loss medication through NHS weight loss services or private prescribing, tracking becomes even more valuable, as it helps your prescriber assess how you're responding to treatment. Our free progress tracker on this page lets you log weigh-ins, set target weights, and see your progress visualised over weeks and months. The app works in both kg and stone—matching how UK adults naturally think about their weight.
- Track daily, weekly, or monthly weigh-ins depending on what suits you
- See trends and patterns in your weight management journey
- Stay motivated with visual progress graphs
- Share data with your GP if needed for clinical decisions
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.
Key Features to Look for in a Weight Tracker
The best weight loss tracker apps include: easy data entry (a few taps to log your weight), progress visualisation (charts showing your trajectory), goal setting (defining realistic targets), and consistency reminders (notifications to help you stay on track). For UK adults managing weight loss with or without medication, your tracker should support both metric (kg) and imperial (stone and pounds) measurements. MyWeightCheck's free progress tracker integrates seamlessly with our BMI calculator, so you can see how your weight loss impacts your BMI category. This is particularly helpful if you're working towards a target BMI for health reasons or to qualify for weight loss treatment on the NHS.
- 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's the best weight loss tracker app in the UK?
The best app is one you'll actually use consistently. MyWeightCheck's free progress tracker is designed specifically for UK adults, supporting stone and kg measurements. It integrates with our free BMI calculator and weight converter, making it easy to monitor both weight and health metrics together. Choose an app with simple interface, regular reminders, and progress visualisation.
How often should I weigh myself when tracking weight loss?
Most evidence suggests once per week (same day, same time) gives the clearest picture. Daily weighing can cause discouragement due to natural fluctuations from water retention and digestion. If tracking weekly, weigh yourself before breakfast and after the toilet for consistency. The NHS recommends weekly monitoring for sustainable weight management.
Can a weight tracker help if I'm using weight loss injections like Mounjaro or Wegovy?
Yes—tracking is particularly valuable with prescription weight loss medication. Your progress tracker creates a record of how you're responding to treatment, which helps your prescriber assess whether dose adjustments are needed. It also shows you the real impact of medication combined with lifestyle changes, keeping you motivated through your weight loss journey.
How do I set realistic weight loss goals?
The NHS recommends losing 0.5–1 kg (1–2 lbs) per week for sustainable results. Use our free BMI calculator to find your target healthy weight range, then work backwards. For example, if your target is 10 kg loss over 12 weeks, that's reasonable and achievable. Your progress tracker helps you break this into weekly milestones and celebrate progress.
Should I share my weight tracker data with my GP?
Yes—if you're working with your GP on weight management (especially if considering prescription weight loss medication), sharing your tracking data helps them understand your commitment and progress. Many GPs use this information to inform decisions about NHS weight loss services. Your consistency in tracking often strengthens your case for accessing specialist tier 3 services.
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.