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 Scale for Body — Understanding Body Weight Measurement
A weight scale for body is a device that measures your total body weight, which is one of the most basic yet important health metrics. In the UK, body weight is typically measured in kilograms (kg), stone, or pounds (lbs), and forms the foundation for calculating your BMI and assessing whether you fall within a healthy weight range according to NHS guidance. Understanding how to use a weight scale effectively and interpret your measurements is essential for tracking your health and making informed decisions about weight management.
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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 Body Weight Scales Work and Why They Matter
A body weight scale measures the force of gravity acting on your body mass, displaying your weight in your chosen unit — kg, stone, or lbs. Modern digital scales are highly accurate and often provide additional metrics like body fat percentage, muscle mass, and water weight, though these secondary measurements can vary in accuracy.
- Consistency is key: Weigh yourself at the same time each day (usually morning, after using the toilet, before eating) for the most reliable measurements
- Weekly tracking: Rather than obsessing over daily fluctuations, aim to record your weight once weekly to spot genuine trends
- UK measurements: Use our free weight converter to switch between kg, stone, and lbs easily — knowing your weight in all three formats helps you understand NHS health guidance and communicate with your GP
- Individual variation: Your weight naturally fluctuates by 1–2 kg day-to-day due to hydration, food intake, hormones, and digestion
Body weight is just one indicator of health. The NHS also recommends measuring waist circumference and calculating your BMI alongside your weight to get a complete picture of your health status.
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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.
Weight Scales and Health Assessment in the UK
Your body weight measurement is used to calculate your BMI (Body Mass Index), which the NHS uses to assess whether you are in a healthy weight range. Use our free BMI calculator to check your personal BMI instantly — simply enter your weight (in kg, stone, or lbs) and height. A healthy BMI ranges from 18.5 to 24.9 for most adults, though South Asian, Chinese, Black African, and Black Caribbean adults have lower recommended thresholds starting at 18.5 to 22.9.
If you're interested in weight management and lifestyle support, our free GLP-1 weight loss calculator can help you explore potential weight loss projections if you're considering prescription weight management options. Track your progress over time using our weight progress tracker to stay motivated and informed.
- 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 on a body weight scale?
The NHS recommends weighing yourself once weekly for the most accurate picture of your health trends. Daily weighing can be demotivating due to natural water retention, digestion, and hormonal fluctuations. Pick the same day and time each week — typically Monday morning — and record it consistently.
Which unit should I use to record my body weight in the UK?
In the UK, all three units are useful: kilograms (kg) for NHS health guidance and clinical settings, stone and pounds (st/lbs) for everyday conversation, and pounds (lbs) for comparing with international health data. Our free weight converter lets you switch between all three instantly, so you can understand your weight in whichever format is most meaningful to you.
Is a body weight scale accurate for assessing health?
Body weight alone is not a complete health assessment. The NHS recommends using weight scales alongside BMI calculation, waist circumference measurement, and other health markers. Muscle weighs more than fat, so two people at the same weight can have very different body compositions. Use our free BMI calculator to get a more complete picture of your health status.
What's the difference between body weight measured at home versus at a clinic?
Clinical scales (used at GPs' surgeries and hospitals) are often calibrated more precisely than home scales, but quality home digital scales are accurate within 0.1–0.5 kg. For personal tracking, consistency matters more than absolute accuracy — use the same scale each time. If your GP records your weight, you can compare it to your home measurements to see if calibration differs.
How does body weight relate to healthy weight management?
Your body weight measurement is the starting point for weight management. Calculate your healthy weight range using our BMI calculator based on NHS guidelines. For South Asian adults and other high-risk groups, lower thresholds apply. If you're interested in prescription weight management options like GLP-1 injections, eligibility is typically based on BMI calculated from your current weight, so accurate measurement is important for clinical assessment.
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.