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 Weekly Tracker — Monitor Your Progress
A weight loss weekly tracker is one of the most effective ways to stay motivated and accountable during your weight management journey. Tracking your weight regularly helps you identify patterns, celebrate progress, and make adjustments to your approach. Whether you're using lifestyle changes, prescription weight loss medication, or a combination of both, keeping a simple weekly record can make a real difference to your success. Our free progress tracker on this page makes weekly logging quick and easy.
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 Weekly Tracking Matters for Weight Loss
Tracking your weight weekly provides valuable insights into your weight management progress. Weekly measurements are more reliable than daily weigh-ins, which can fluctuate by 1–2 kg due to water retention, food intake, and hormonal changes. A weekly tracker helps you see the genuine trend without getting discouraged by normal daily variations.
- Identifies sustainable patterns over time rather than focusing on daily fluctuations
- Provides motivation by showing real progress, even if gradual
- Helps you adjust diet and exercise habits based on what's actually working
- Creates accountability — research shows people who track weight lose more consistently
- Supports adherence to prescription weight loss medication like Mounjaro or Wegovy by demonstrating results
Studies show that people who track their weight management progress are significantly more likely to achieve and maintain their goals. Use our free progress tracker above to log your weekly weight, and combine this with our BMI calculator to monitor whether your weight loss is moving you towards a healthier BMI range.
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.
How to Use a Weekly Tracker Effectively
For best results, weigh yourself at the same time each week — ideally on the same day and time of day, wearing similar clothing. Morning weigh-ins before breakfast give the most consistent readings. Record your weight in the unit you prefer: stone and pounds (UK standard), or kilograms. Look at the trend over 3–4 weeks rather than individual measurements.
Combine weekly tracking with our GLP-1 weight loss calculator to see whether your actual results align with clinical expectations for your dose. A safe, sustainable rate of weight loss is 0.5–1 kg per week according to NHS guidance. If you're using prescription weight loss medication, your weekly tracker helps your prescriber assess whether the dose is working effectively for you. Don't aim for perfection — consistent tracking builds habits and long-term success.
- 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.
How often should I weigh myself for accurate tracking?
Weigh yourself once per week at the same time and day — ideally in the morning before breakfast. Daily weigh-ins fluctuate too much and don't reflect true progress. Weekly measurements show the genuine trend and prevent motivation dips from normal water weight variations.
What's a realistic weekly weight loss target?
The NHS recommends losing 0.5–1 kg (1–2 lbs) per week for sustainable, healthy weight loss. This typically requires a calorie deficit of around 500 kcal per day. Faster loss is possible with prescription medication and medical support, but consistency beats speed for long-term success.
Should I record weight in kg, stone, or pounds?
Use whichever unit you're most comfortable with — the conversion doesn't change the trend. Many UK adults prefer stone and pounds. Our weight converter makes it easy to switch between kg, stone, and lbs. Choose the measurement system you'll stick with consistently.
Can I use a weekly tracker with weight loss medication like Mounjaro or Wegovy?
Yes, absolutely. Weekly tracking is particularly valuable with prescription weight loss medication. It helps you monitor whether your dose is working effectively and provides clear evidence of results. Combine your tracker with our GLP-1 weight loss calculator to compare your actual results with clinical trial averages.
What should I do if my weight doesn't change for a week?
One week without change isn't concerning — weight loss isn't always linear. Look at your 3–4 week trend instead. Factors like hormones, water retention, and exercise timing affect weekly measurements. Stick to your approach for at least 2–3 weeks before adjusting. If progress stalls for several weeks, discuss with your GP or prescriber.
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.