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
What Is Bare Weight and Why Does It Matter for Your Health?
Bare weight refers to your body weight measured without clothing or shoes—the most accurate baseline for health tracking. In the UK, measuring bare weight is the standard approach used by the NHS and most healthcare professionals when assessing your health status. Whether you're converting between kg and stone, calculating your BMI, or tracking weight management progress, bare weight provides the consistent, comparable measurement needed for meaningful health decisions and personalised guidance from your GP.
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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.
How to Measure Your Bare Weight Accurately
For the most reliable measurement, weigh yourself bare (without clothes, shoes, or jewellery) at the same time each day, ideally in the morning before eating or drinking. Use digital scales on a flat, hard surface rather than carpet, as uneven ground can affect accuracy. The NHS recommends consistent daily or weekly measurement as part of effective weight management.
- Weigh yourself at the same time daily for consistency
- Use the same scales each time
- Record your weight in kg for clinical accuracy
- Track weekly averages rather than daily fluctuations
- Share measurements with your GP during health reviews
When measuring weight for health assessments, bare weight eliminates variables that could skew results. This is why your GP always requests bare weight during health checks and why our free weight converter and BMI calculator both work with bare weight measurements for accurate UK health guidance.
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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.
Bare Weight and Your Health Assessment
Your bare weight is the foundation for calculating your BMI (Body Mass Index), which the NHS uses as the primary screening tool for healthy weight status. A healthy BMI sits between 18.5 and 24.9, though for adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds due to increased health risk at lower BMI levels.
Beyond BMI, bare weight forms the basis for weight management discussions with your GP and helps track progress if you're making lifestyle changes or considering treatment options. Use our free BMI calculator above to understand your personal health context, or try our weight converter to switch between kg, stone, and pounds instantly.
- 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 bare weight the same as actual body weight?
Yes, bare weight is your actual body weight without clothing, shoes, or accessories. It's the standard measurement used by the NHS and healthcare professionals for accurate health assessment. This is why it's essential to measure consistently using the same method and scales for reliable tracking.
Should I measure bare weight in kilograms or stone?
Both are valid, but the NHS uses kilograms for clinical records and health calculations. Our weight converter makes it easy to switch between kg, stone, and pounds. For health tracking, recording in kg provides the most accurate basis for BMI calculation and comparison with NHS guidelines.
Why does my weight fluctuate daily if I measure bare weight?
Daily fluctuations (typically 1–2 kg) are normal due to hydration levels, food intake, hormonal changes, and time of day. This is why the NHS recommends tracking weekly averages rather than obsessing over daily changes. Consistent measurement at the same time each morning gives a clearer picture of actual weight trends.
How does bare weight relate to healthy weight for my height?
Your bare weight determines your BMI, which shows whether you fall within the healthy weight range for your height. Use our free BMI calculator to find your personal healthy weight range in stone and pounds. Your GP can also provide personalised healthy weight guidance based on your individual health factors.
Can I use bare weight to track weight loss progress?
Absolutely. Bare weight is the best baseline for tracking weight loss over time, especially alongside our free progress tracker. Weekly measurements taken at the same time each day provide the clearest picture of your progress, particularly if you're making lifestyle changes or considering weight management options.
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.