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
Free Weight Loss App — Track and Manage Your Progress
A free weight loss app can be an essential tool for tracking your progress and staying motivated on your weight management journey in the UK. Whether you're following a reduced-calorie diet, increasing physical activity, or considering prescription weight loss medication, having a simple way to record your weight, BMI, and goals makes a real difference. MyWeightCheck offers free tools including a progress tracker, BMI calculator, and weight converter — all designed to support your weight loss efforts without any cost or subscription required.
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.
How Free Weight Loss Apps Support Your Goals
Free weight loss apps work by helping you track progress over time, which increases accountability and motivation. Research shows that keeping records of weight, diet, and exercise is strongly linked to successful, sustainable weight loss. Our free progress tracker lets you log your weight weekly or daily, visualise trends, and celebrate milestones without hidden fees or paywalls.
- Record weight changes in kg, stone, or lbs — whatever measurement you prefer
- Calculate your BMI instantly using our free calculator to monitor health metrics
- Set realistic targets aligned with NHS guidance (losing 0.5–1 kg per week)
- Track progress even if you're using prescription weight loss medication alongside lifestyle changes
Most weight management experts agree that self-monitoring is one of the most effective strategies for sustained weight loss in the UK. Free apps remove financial barriers to accessing these tools.
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.
Free vs Paid Weight Loss Apps — What You Need to Know
Paid weight loss apps often promise exclusive features, but research shows that basic tracking is just as effective. A free weight loss app gives you the core tools needed: weight logging, BMI calculation, and progress visualisation. MyWeightCheck includes everything you need at no cost.
For prescription weight loss medication like Mounjaro or Wegovy, a free app paired with clinical monitoring from your GP or prescriber is all you need. Our GLP-1 weight loss calculator can help estimate potential outcomes at different doses alongside your app tracking. Paid apps rarely add clinical value — your prescriber's guidance matters far more than premium features.
- 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 good as paid ones?
Yes. Research shows basic tracking features are equally effective for weight loss. The best app is the one you'll actually use consistently. Free apps give you BMI calculation, weight logging, and progress tracking — the core tools that matter. Paid apps add convenience but not extra weight loss benefit.
Can I use a free weight loss app if I'm taking Mounjaro or Wegovy?
Absolutely. A free weight loss app tracks your progress perfectly alongside prescription medication. Our progress tracker works with any weight management approach. Your prescriber will monitor your health separately — the app is for your personal motivation and accountability.
How often should I log my weight using a free app?
Once weekly is ideal for sustainable weight loss tracking. Daily weighing can be misleading because weight fluctuates due to water, food, and hormones. Weekly logs give you clearer trends. Our progress tracker makes weekly logging simple and shows your true progress over time.
What's the difference between MyWeightCheck and other free weight loss apps?
MyWeightCheck is designed specifically for UK adults with NHS-aligned measurements and guidance. We provide free BMI calculators using NHS thresholds, weight converters between kg and stone, and a progress tracker — no ads, no upsells, no premium tiers. All tools are completely free.
Can a free weight loss app replace GP support?
No. A free app is a tracking tool, not medical advice. If you're overweight or obese, speak to your GP about weight management support. Your GP can refer you to NHS weight management services or discuss prescription weight loss options if appropriate. Use the app alongside professional guidance, not instead of it.
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.