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
Printable Weight Loss Tracker Free — Track Your Progress with UK Weight Loss Options
A free printable weight loss tracker helps you monitor your progress when managing your weight in the UK. Whether you're using lifestyle changes alone or exploring prescription weight loss medication options like Mounjaro and Wegovy, tracking your results is essential. This guide explains how to use a tracker effectively, what metrics matter most, and how prescription weight management options work for eligible UK adults. We'll also help you understand whether you might qualify for medication-based support through the NHS or private prescribing.
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.
UK Prescription Weight Loss Options and Tracking Progress
Three prescription weight loss medications are currently licensed in the UK for weight management. Mounjaro (tirzepatide) is a once-weekly injection that works as a dual GIP and GLP-1 receptor agonist. Wegovy (semaglutide) is also once-weekly and activates the GLP-1 pathway alone. Saxenda (liraglutide) is a daily injection. All three require a prescription following a clinical assessment.
In clinical trials, Mounjaro helped participants lose an average of 15–21% of their body weight, whilst Wegovy showed average weight loss of approximately 15%. However, individual results vary significantly. These medications work best alongside a reduced-calorie diet and increased physical activity — this is where your tracker becomes invaluable. Recording your weight, measurements, energy levels, and how you feel helps you and your prescriber assess whether the medication is working effectively for you.
- Track weekly weight (use our free weight converter to switch between kg, stone, and lbs)
- Note any side effects or tolerance changes
- Record dietary and exercise habits
- Monitor non-scale victories (energy, clothes fit, sleep quality)
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.
NHS vs Private Access — How to Find Out If You're Eligible
NHS route: Eligibility for prescription weight loss medication through the NHS typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. You'll need referral to a specialist tier 3 weight management service — ask your GP. However, NHS waiting lists vary significantly by region, and availability is limited in many areas. Our free BMI calculator above can help you check whether you might meet the initial eligibility threshold.
Private route: Available through UK-licensed prescribers following an online clinical assessment, without needing an NHS referral. This option is typically faster, though it involves a cost. Use our GLP-1 weight loss calculator to estimate potential outcomes at different medication doses. Either way, tracking your progress from day one helps you and your prescriber make informed decisions about 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.
What should I track on my weight loss tracker?
Track weekly weight (in your preferred unit — kg, stone, or lbs), waist measurements, how you feel physically and emotionally, any side effects if taking medication, dietary habits, exercise, and non-scale victories like improved energy or better sleep. This rounded picture helps your GP or prescriber assess progress beyond the number on the scale.
Do I need to print a tracker or can I use a digital one?
Both work equally well. Printed trackers are tactile and many people find writing by hand motivating. Digital trackers (spreadsheets, apps) are convenient and can calculate averages automatically. Choose whichever suits your lifestyle best — consistency matters more than format.
Who is eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Eligibility is assessed individually by a prescriber following a clinical consultation. Your GP can advise whether you might qualify.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% for Mounjaro and approximately 15% for Wegovy alongside diet and exercise changes. However, individual results vary significantly — some people lose more, others less. Your tracker helps you see your personal progress over time.
Can I use a weight loss tracker without medication?
Absolutely. Tracking is valuable whether you're managing weight through diet, exercise, lifestyle changes, or medication. Regular monitoring helps you identify patterns, stay motivated, and make evidence-based adjustments. It's a tool for any weight management approach.
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.