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 Tracker for UK Adults
A weight loss tracker is one of the most effective tools for managing your weight and staying motivated throughout your weight loss journey. Whether you're following a reduced-calorie diet, increasing physical activity, or using prescription weight loss medication, tracking your progress helps you see real results and identify patterns that support your goals. MyWeightCheck offers a completely free weight loss tracker designed for UK adults, helping you monitor your weight, celebrate milestones, and stay accountable to 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.
How a Weight Loss Tracker Supports Your Goals
Tracking your weight loss provides several evidence-based benefits for sustainable weight management in the UK context. Regular monitoring helps you see progress over time — even when weekly changes are small — which boosts motivation and confidence. A tracker also reveals patterns: whether you lose weight more steadily during certain weeks, how your progress relates to lifestyle changes, or if you need to adjust your approach.
For those using prescription weight loss medication like Mounjaro or Wegovy as part of an NHS weight management programme or private prescription, a tracker becomes even more valuable. It helps you and your prescriber assess whether the medication is working as expected, supporting decisions about dose adjustments or continued treatment. Use our free progress tracker above to log your weight weekly — consistency matters more than daily weighing, which can fluctuate due to water retention, food intake, and hormonal changes.
- Weekly logging is more reliable than daily weighing
- Visual progress charts help identify real trends
- Shared data with your GP supports clinical conversations
- Milestone celebrations maintain long-term motivation
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.
Setting Realistic Goals Within Weight Management UK
The NHS recommends losing 0.5 to 1 kg per week as a sustainable and healthy rate of weight loss. This means a realistic 10-week goal might be losing 5–10 kg, depending on your starting weight and calorie deficit. Setting specific, measurable targets — such as "support gradual weight management" — helps you track real progress rather than vague aspirations.
Your weight loss tracker should also help you monitor BMI changes and health improvements alongside the numbers on the scale. Calculate your starting BMI using our free BMI calculator to understand your baseline, then track how your BMI category changes as you progress. Many people find that non-scale victories — improved energy, better sleep, easier movement, or improved blood sugar control — matter just as much as the weight itself. Record these alongside your weight to see the full picture of your weight management journey.
- 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 a weight loss tracker really effective?
Yes. Research shows that self-monitoring and regular tracking are strongly associated with successful, sustainable weight loss. Tracking creates awareness, helps you spot patterns, and keeps you accountable. Combined with diet and physical activity changes, a tracker significantly improves outcomes.
How often should I weigh myself when using a tracker?
The NHS recommends weighing yourself once per week at the same time of day (e.g., Monday morning before breakfast). Daily weighing can be demoralising due to normal water and food-related fluctuations. Weekly consistency gives a clearer picture of real progress.
Can I use a weight loss tracker if I'm on Mounjaro or Wegovy?
Absolutely. A tracker is especially useful when taking prescription weight loss medication. It helps you and your prescriber monitor whether the medication is supporting your goals, making informed decisions about doses, and ensuring you're combining medication with the recommended lifestyle changes.
What should I track besides weight?
Beyond weight, consider tracking waist circumference, BMI (calculate using our free BMI calculator), energy levels, how clothes fit, and how you feel. These non-scale victories are just as important as the number on the scale and often improve before significant weight loss occurs.
Is MyWeightCheck's weight loss tracker really free?
Yes, our progress tracker is completely free — no registration, no premium tier, no hidden costs. We also offer free BMI calculator, weight converter, and GLP-1 weight loss calculator tools to support your entire weight management journey in the UK.
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.