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 — UK Health Guide
A weight scale for body measurement is a tool that records your body weight, but understanding what that number means requires context. In the UK, we use stone, pounds, and kilograms to express weight, and the NHS provides guidance on healthy weight ranges based on height and age. A scale is just one part of health monitoring — your GP can help you understand whether your weight falls within a healthy range and what lifestyle changes might support your wellbeing.
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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 Weight Scales Work And What They Measure
A body weight scale measures the total force of gravity acting on your body mass, displaying this as weight in kilograms, stone, or pounds. However, a scale cannot distinguish between muscle, fat, bone, and water — it simply provides a total number. This is why the NHS emphasises that weight alone is not a complete picture of health.
- Digital scales are most common in UK homes and provide readings in kg or stone and pounds
- Bathroom scales vary in accuracy depending on placement (should be on a hard, level surface, not carpet)
- Bioelectrical impedance scales claim to estimate body fat percentage, but these readings can be affected by hydration levels and are less reliable than clinical methods
- Clinical scales (used in GP surgeries and hospitals) are calibrated and more accurate for medical assessment
For health monitoring, weighing yourself once weekly at the same time of day (typically morning, before eating) provides the most consistent data. Daily fluctuations of 0.5–1.5 kg are normal due to water retention, food intake, and hormones.
Clinically BackedWeight Loss
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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.
UK Health Guidance And Weight Management
The NHS recommends assessing weight using BMI (body mass index) alongside waist circumference rather than weight alone. A healthy BMI falls between 18.5 and 24.9 for most UK adults — though lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean populations. Use our free BMI calculator above to find your personal BMI based on your height and weight, which provides immediate context for your scale reading.
If you're considering weight management, our weight converter tool helps translate your weight between kg, stone, and pounds for clarity. For those exploring prescription weight loss support, our GLP-1 weight loss calculator can project potential outcomes. Sustainable weight management combines regular monitoring with lifestyle changes — your GP can provide personalised advice for your situation.
Weight loss, if recommended by your GP, should happen gradually at a rate of 0.5–1 kg per week for sustainable results. Scales are useful for tracking progress, but remember that weight fluctuates naturally due to hormones, sodium intake, and physical activity. If you're not seeing progress on the scale but feel stronger or your clothes fit differently, this may reflect positive changes in body composition (muscle gain or fat loss) that the scale alone won't show. Your GP can help you set realistic targets and monitor whether your weight management approach is working for your individual health needs.
- 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's the best type of weight scale for home use in the UK?
Digital bathroom scales are practical for most people and provide readings in stone and pounds or kilograms. Place the scale on a hard, flat surface (not carpet) for accuracy. Check that it's calibrated correctly, and weigh yourself at the same time each day for consistent measurements. Clinical scales in GP surgeries are more accurate if you need precise readings for medical purposes.
How often should I weigh myself?
Once weekly is ideal for tracking long-term trends without becoming obsessed with daily fluctuations. Weigh yourself at the same time of day (usually morning, before eating and after using the bathroom) for consistency. Daily weighing can be misleading because weight naturally varies by 0.5–1.5 kg due to water retention, food, and hormones.
Does my weight on a scale tell me if I'm healthy?
Weight is just one indicator of health. The NHS recommends using BMI (calculated from weight and height), waist circumference, and overall fitness level for a fuller picture. Someone with more muscle may weigh more but be very healthy. Your GP can assess whether your weight is healthy in context of your age, health conditions, and lifestyle.
What's the difference between weight and body composition?
Weight is your total mass; body composition is the breakdown of muscle, fat, bone, and water. A scale only measures weight. Two people at the same weight can look different and have different health profiles depending on their muscle-to-fat ratio. Scales that claim to measure body fat are less accurate than clinical methods like DEXA scans.
Should I use a weight scale if I'm trying to lose weight?
Yes, scales are useful for tracking progress, but combine them with other measures like how you feel, fitness improvements, and how clothes fit. Aim for 0.5–1 kg weight loss per week with sustainable lifestyle changes. If you're considering medication-supported weight loss, our weight loss calculator can help estimate potential outcomes based on clinical data. Always discuss your weight management plan with your GP. ```
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.