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
Good Scales for Weight Loss — What Matters Most
Choosing the right scales is one of the most overlooked parts of weight management in the UK. If you're serious about tracking progress—whether through diet changes, increased physical activity, or prescription weight loss medication—accurate, reliable scales make a real difference. This guide explains what features to look for, how often to weigh yourself, and how to use scales effectively as part of your weight loss journey.
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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.
Key Features of Weight Loss Scales
The best scales for weight loss do more than just show your weight. Look for digital displays that are easy to read, with measurements in both kg and stone—important for UK users who often think in stone and pounds. High accuracy is essential; choose scales that measure to 0.1 kg (100g) precision, not larger increments. Some scales offer body composition analysis (body fat percentage, muscle mass, water weight), which can be useful alongside BMI tracking, though these estimates vary in accuracy.
- Digital readout in kg, stone, and lbs
- Precision of ±0.1 kg or better
- Non-slip surface for safety
- Large display visible from standing position
- Battery indicator and low-battery warning
- Optional: Bluetooth connectivity to sync with apps for weight loss tracking
Budget options start around £15–£30 for basic digital scales. Premium scales with Bluetooth and body composition analysis cost £50–£150. For most weight loss tracking, a basic accurate scale is perfectly sufficient—the features matter less than consistency and reliability.
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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.
Weighing Yourself Effectively for Weight Loss
Frequency matters less than consistency. NHS weight management guidance suggests weighing yourself once weekly, ideally at the same time each day (morning, after using the bathroom, before eating) to reduce natural fluctuations from food and water. Daily weighing can be demotivating because weight naturally varies 0.5–2 kg day-to-day due to hydration, digestion, and hormones.
If you're using prescription weight loss medication like GLP-1 injections as part of NHS weight loss or private prescription weight loss treatment, weekly weigh-ins help track medication effectiveness over 4–8 week cycles. Use our free progress tracker above to log weekly weights and spot trends—a gradual downward line matters far more than day-to-day changes. Consider taking body measurements (waist, hip, chest) alongside scale weight, as some weight loss involves fat loss while muscle is preserved.
- 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.
Which scales are best for tracking weight loss in the UK?
Digital scales accurate to 0.1 kg, displaying results in kg, stone, and pounds, are ideal for UK weight loss tracking. Brands like Tanita, Salter, and basic Withings models are reliable and affordable. Choose non-slip, easy-to-read displays over fancy features—consistency and accuracy matter more than Bluetooth connectivity for effective tracking.
How often should I weigh myself during weight loss?
The NHS recommends weighing yourself once weekly at the same time (morning, after bathroom, before food) to track progress reliably. Daily weighing isn't recommended because natural fluctuations from hydration and digestion can be demotivating. Weekly weigh-ins give a clearer picture of actual weight trends over time.
Can smart scales with body composition analysis help with weight loss?
Body composition scales estimate body fat, muscle, and water percentage, which can provide motivation beyond scale weight alone. However, these estimates are less accurate than professional measurements. They're useful as a tracking tool if you want more detail, but a basic accurate scale is sufficient for effective weight loss monitoring.
How do I use scale readings alongside BMI tracking?
Use the free BMI calculator on this page to calculate your BMI from your weekly scale weight and height. Combined with scale numbers and measurements, this gives you a complete picture of progress. Our weight converter also helps you track in stone if you prefer UK measurements—many find stone more motivating than kg alone.
Should I use scales if I'm taking prescription weight loss injections?
Yes—weekly weighing is standard practice when using prescription weight loss medication like Mounjaro or Wegovy. Scales help you and your prescriber assess how well the medication is supporting your weight management alongside diet and exercise changes. Track weekly and log results using our progress tracker for clear trends.
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.