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
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Digital Body Weight Scale — Accuracy & Health Tracking
A digital body weight scale is an essential tool for monitoring your weight as part of any health management plan. Unlike traditional mechanical scales, digital scales use electronic sensors to measure body weight with greater precision and often provide additional health metrics. Whether you're tracking progress for general wellness or monitoring weight changes as part of a weight management journey under NHS guidance, understanding how digital scales work and their limitations helps you use them effectively alongside other health metrics like BMI and waist circumference.
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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 Digital Scales Work and Their Accuracy
Digital bathroom scales use load cell technology — electronic sensors that detect the pressure of your weight and convert it into a digital reading. Most consumer digital scales are accurate to within 0.1–0.5 kg (approximately 0.2–1 lb) when used correctly. For weight management and UK health tracking, this precision is generally sufficient for monitoring trends over time, though it may not be suitable for precise clinical measurements.
- Most digital scales work best on hard, level surfaces (not carpet)
- Weight fluctuates throughout the day based on hydration, meals, and hormones — weigh yourself at the same time daily (morning, before eating) for consistent readings
- Scales need regular battery replacement; low batteries reduce accuracy
- High-quality digital scales cost £20–£100 and are more reliable than budget models
For health monitoring purposes, track your weight trend over weeks and months rather than daily variations. Use our free weight converter to understand your weight in both kg and stone, and try our BMI calculator to see how your weight relates to healthy weight ranges according to NHS guidelines.
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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.
Advanced Features and Weight Management Integration
Many modern digital scales offer additional health metrics including body fat percentage, muscle mass, bone density, and BMI. However, accuracy of these bioelectrical impedance analysis (BIA) features varies significantly and is generally less reliable than weight measurement alone. Body fat percentage readings from home scales can have a margin of error of ±3–5%, making them less useful for precise clinical assessment.
For UK weight management — whether through lifestyle changes or prescription treatments — your digital scale is most valuable as a simple weight-tracking tool. Combine regular weighing with our free progress tracker to log your journey over time, and use the weight management resources on this site for broader health context including NHS healthy weight guidance and eligibility information for weight management support.
- 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.
Are digital scales more accurate than mechanical scales?
Yes, digital scales are generally more accurate than mechanical scales, typically accurate to within 0.1–0.5 kg when used correctly on a hard level surface. However, all household scales have limitations — daily fluctuations in weight are normal and not always reflective of actual fat loss or gain.
How often should I weigh myself for accurate health tracking?
Weigh yourself once or twice per week at the same time of day (ideally morning before eating) for the most useful tracking. Daily weighing can be misleading due to water retention, food intake, and hormonal changes. Weekly or monthly trend tracking is more informative than daily readings.
Can digital scales measure body fat percentage accurately?
Digital scales can estimate body fat percentage, but accuracy varies significantly (±3–5% error margin). For clinical assessment, professional methods like DEXA scans or underwater weighing are more accurate. For home monitoring, weight and BMI trends are more reliable indicators.
Do I need an expensive digital scale for weight management?
No — mid-range digital scales (£30–£60) offer the same core accuracy as premium models for weight measurement. Advanced features like body fat analysis or WiFi connectivity add cost but not necessarily accuracy for home health tracking.
How does digital scale monitoring fit into NHS weight management?
Regular weighing is part of effective weight management within NHS guidance. Use your digital scale weekly to track progress, alongside our BMI calculator to understand your health context. If you're exploring weight management options, understanding your baseline weight helps when discussing options with your GP or healthcare provider.
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.