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
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Best Free Weight Loss Apps for UK Users
Finding the right weight loss app can make a real difference to your weight management journey. Whether you're tracking calories, monitoring progress, or seeking motivation, free weight loss apps offer accessible tools to support lifestyle changes. This guide covers the best free options available to UK users, from calorie counters to progress trackers, and how they fit into a broader weight management approach alongside diet and physical activity.
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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.
Top Free Weight Loss Apps and Features
Several free weight loss apps are popular with UK users and offer valuable features:
- Calorie tracking apps — Log meals and monitor daily intake against your goal (typically 500 kcal deficit supports ~0.5 kg weekly loss)
- Food database apps — Access to thousands of UK food entries with nutritional information
- Progress tracking tools — Log weight, measurements, and photos to visualise your journey over time
- Exercise logging — Record workouts and estimate calorie burn to balance energy intake
- Hydration reminders — Simple tools to track water intake throughout the day
- Meal planning guides — Some apps offer recipe suggestions aligned with calorie targets
Most free versions include basic logging and tracking features, with premium options unlocking advanced analytics. When choosing an app, look for UK food database options, metric measurements (kg and stone), and integration with other health apps or wearables you use.
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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.
Apps Work Best Alongside Other Tools and Support
Weight loss apps are most effective when combined with other strategies. Track your BMI and healthy weight range using our free BMI calculator to understand your personal targets — this gives apps a clear goal to work towards. Many users find success pairing app tracking with a reduced-calorie diet and increased physical activity. For weight management in the UK, the NHS recommends losing weight at a rate of 0.5 to 1 kg per week for sustainable results. If you're considering prescription weight loss medication as part of your approach, our GLP-1 weight loss calculator can help you estimate potential outcomes. Apps provide the daily accountability that supports long-term success — consistency matters more than perfection.
- 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.
Are free weight loss apps as effective as paid versions?
Free apps often include the core features most users need — calorie logging, weight tracking, and progress visualisation. Paid versions typically add advanced analytics, personalised coaching, or ad-free experiences. Effectiveness depends more on consistent use than the paid status. Choose based on features you'll actually use.
What features should I look for in a UK weight loss app?
Prioritise UK food databases with accurate nutritional data, support for metric measurements (kg and stone), and an intuitive logging interface. Integration with other health apps, offline functionality, and community features can also enhance engagement and motivation.
Can weight loss apps replace professional support?
Apps are excellent tracking tools but should complement, not replace, advice from your GP or a registered dietitian. If you have underlying health conditions or are considering prescription weight loss medication, always consult your healthcare provider for personalised guidance.
How often should I log my progress in a weight loss app?
Daily food logging is most effective for awareness and accountability, though some users prefer weekly summaries. Weigh yourself once weekly on the same day and time for accurate progress tracking — daily fluctuations are normal and don't reflect true fat loss.
Do weight loss apps work for NHS weight loss goals?
Yes, many users find apps helpful for NHS weight management programmes. The NHS emphasises sustainable lifestyle changes alongside calorie deficit — apps support this by providing structure, tracking, and motivation over the weeks and months of your weight loss journey.
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.