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's the Best Scale for Weight Loss?
Choosing the right scale is more important than many people realise when tracking weight loss progress. A good scale provides accurate, consistent measurements that help you monitor real changes in body weight over time. Whether you're following an NHS weight management programme, using prescription weight loss injections like Mounjaro or Wegovy, or simply working towards a healthier weight through diet and exercise, having a reliable scale ensures your efforts are properly tracked. The best scales for weight loss combine accuracy with user-friendly features that support your UK weight management journey.
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.
Types of Scales and Their Accuracy
Digital scales are the most popular choice for home weight tracking and generally offer accuracy to within 0.1 kg. They're affordable, easy to read, and provide consistent results when used correctly. Bathroom scales with body composition analysis (bioelectrical impedance scales) measure more than just weight — they estimate body fat percentage, muscle mass, water retention, and BMI. These can be helpful for understanding overall body composition changes, though their fat percentage estimates are less accurate than professional methods.
Smart scales connect to smartphone apps and automatically track your weight loss over time, making it easier to spot trends and monitor progress. However, they're more expensive (typically £40–£150+). For most people working on prescription weight loss medication or general weight management in the UK, a basic digital scale (£10–£30) is perfectly adequate and just as accurate as premium models.
- Mechanical scales are outdated and far less accurate than digital alternatives
- Accuracy matters most — look for ±0.1 kg consistency
- Features like connectivity are convenient but not essential for effective tracking
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
How to Weigh Yourself Accurately
The scale you choose is only half the equation — how you use it matters equally. Weigh yourself at the same time each day, ideally first thing in the morning before eating or drinking, as this gives the most consistent reading. Place your scale on a hard, level surface (not carpet), and step on gently without shifting your weight around. Remember that natural weight fluctuations of 0.5–1 kg daily are completely normal due to water retention, digestion, and hormonal changes.
When using our free progress tracker to log your weight loss, focus on weekly or fortnightly trends rather than daily numbers. This approach works especially well if you're tracking results with weight loss injections or following an NHS-recommended calorie deficit. Weight loss medications like Mounjaro and Wegovy work best alongside consistent tracking and lifestyle changes — use your scale as a tool to monitor success, not as a source of daily stress.
- 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 accurate do home scales need to be for weight loss tracking?
Digital scales accurate to ±0.1 kg are sufficient for home tracking. What matters most is consistency — using the same scale at the same time daily. Small variations between days are normal and usually reflect water retention or food in your digestive system, not actual fat loss.
Are body composition scales worth buying for weight loss?
Body composition scales can provide useful additional context — they show changes in muscle and fat alongside weight. However, their body fat percentage estimates aren't as accurate as professional methods. For weight loss monitoring alone, a basic digital scale is just as effective.
Should I weigh myself daily or weekly when losing weight?
Weigh yourself daily if you find it motivating, but focus on weekly averages rather than daily fluctuations. Natural weight changes of 0.5–1 kg daily are completely normal. Track trends over weeks rather than obsessing over single-day changes.
Can I use my BMI calculator and scale together for weight loss?
Yes — weigh yourself regularly, then use our free BMI calculator to track how your BMI changes over time. This gives you two important measurements: your actual weight in kg or stone, and your BMI category according to NHS guidelines.
How does accurate weighing help with prescription weight loss medication?
If you're using Mounjaro, Wegovy, or other weight loss medications, accurate tracking shows whether the medication is working for you. Regular measurements help your prescriber or GP assess effectiveness and adjust doses if needed, and they support your weight management uk progress.
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.