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 an LB Score in Weight Health?
An LB score (often written as "lb score") typically refers to weight measurements in pounds, a unit commonly used in the UK alongside stone and kilograms. Understanding your weight in different units helps you track health progress and compare measurements across NHS guidance, weight management tools, and healthy weight UK standards. Your GP may discuss your weight using various measurements, so knowing how to convert and interpret them is important for health literacy and informed decision-making about your wellbeing.
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 LB and Stone Measurements Work Together
In the UK, body weight is traditionally measured using stone and pounds (lbs), though healthcare professionals increasingly use kilograms for clinical precision. One stone equals exactly 14 pounds, making conversions straightforward: an adult weighing 70kg converts to approximately 11 stone (154 lbs). The NHS uses kilogram measurements in medical records but recognises that UK adults are more familiar with stone and pounds in everyday life.
- 1 stone = 14 pounds exactly
- 1 kilogram = 2.20462 pounds
- 1 kilogram = 0.157473 stone
- Most UK gym and home scales display both kg and st/lbs
Understanding these measurements matters because healthy weight ranges, BMI categories, and weight loss targets are all expressed in these units. Use our free weight converter above to instantly switch between kg, stone, and pounds for your personal measurements.
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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.
LB Score, BMI, and Healthy Weight Context
Your weight in pounds alone doesn't determine health — height matters equally. This is why NHS health guidance focuses on BMI (Body Mass Index) rather than absolute weight. BMI combines your weight with your height to estimate whether you're in a healthy range. A healthy BMI for UK adults is between 18.5 and 24.9 kg/m². Two people weighing the same in lbs may have very different BMI values based on their height.
Calculate your personal BMI instantly using our free BMI calculator above to see where you fall on NHS healthy weight guidelines. Your GP can provide personalised advice about what your weight and BMI mean for your individual health, especially if you have existing health conditions or are considering weight management options.
- 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 does "lb score" mean in health contexts?
LB score refers to weight measured in pounds (lbs), a traditional UK unit. It's part of the stone and pounds system (1 stone = 14 lbs). Healthcare professionals use lbs alongside kilograms to help patients understand their weight in familiar UK measurements. Your actual health status depends on your BMI, not just your weight in pounds.
How do I convert my weight from pounds to kilograms?
Divide your weight in pounds by 2.20462 to get kilograms. For example, 154 lbs ÷ 2.20462 = approximately 70 kg. Our free weight converter above instantly converts between kg, stone, and pounds — just enter your weight and switch units.
Does my weight in pounds tell me if I'm overweight?
Not on its own — your height is equally important. BMI combines weight and height to assess whether you're in a healthy range according to NHS guidelines. Two people weighing 154 lbs may have very different BMI values. Use our BMI calculator to see your personal healthy weight range for your height.
What's the difference between stone and pounds measurements?
Stone and pounds are both imperial units. 1 stone = 14 pounds exactly. UK adults traditionally describe weight in stone and pounds (e.g., "11 stone 3 pounds"), while the NHS uses kilograms clinically. Both measurements are equally valid — it's about what's familiar to you.
Can I use "lb score" to track weight loss progress?
Yes, tracking weight in pounds works fine for progress monitoring. However, weight naturally fluctuates daily due to hydration, food, and hormones. Use our free progress tracker on this page to log weight over weeks and months — this reveals true trends. Your GP can also discuss sustainable weight loss targets based on your BMI and health.
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.