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
Understanding Your Kg Scale for Accurate Weight Measurement
A kilogramme (kg) scale measures your body weight in metric units and is the standard measurement used by the NHS and healthcare professionals across the UK. Whether you're tracking progress toward a healthy weight, monitoring a medical condition, or checking your BMI, understanding how to use and read your kg scale correctly is essential for accurate health monitoring. Many UK adults find kg measurements useful alongside stone and pounds for weight management purposes.
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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 to Use Your Kg Scale Accurately
To get reliable weight measurements from your kg scale, weigh yourself at the same time each day—ideally in the morning before eating or drinking, and after using the toilet. Wear minimal clothing and stand with your feet centred on the scale, distributing weight evenly across both feet. For consistency, use the same scales each time you weigh yourself, as different scales may show slight variations.
- Check that your scale is on a flat, hard surface (not carpet)
- Calibrate your scale monthly if it has a reset function
- Replace batteries regularly if it's electronic
- Record measurements weekly rather than daily to avoid obsessing over minor fluctuations
Your weight naturally varies by 1–2 kg throughout the day due to hydration, food intake, and hormonal changes. This is completely normal and does not reflect actual fat loss or gain. Using our free BMI calculator above alongside your kg scale reading helps you understand whether your weight falls within a healthy range for your height according to NHS guidance.
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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.
Interpreting Your Kg Scale Reading in UK Health Context
Once you have your kg measurement, you can interpret it using NHS healthy weight guidelines. A healthy BMI range is 18.5 to 24.9, which corresponds to different kg weights depending on your height. For example, at 1.70m tall, a healthy weight range is approximately 53–72 kg. Our free weight converter on this page instantly converts your kg reading to stone and pounds if you prefer imperial measurements, which are commonly used in the UK.
If you're tracking weight loss or considering lifestyle changes, recording your kg scale reading weekly in our free progress tracker helps you visualise trends over time. A sustainable rate of weight loss is approximately 0.5–1 kg per week according to NHS guidance, achieved through a balanced diet and increased physical activity.
- 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 kg scale?
The NHS recommends weighing yourself once a week at the same time of day for tracking progress. Daily weighing can be demotivating due to natural weight fluctuations. Record weekly measurements to spot genuine trends rather than reacting to daily changes caused by hydration, food, or hormones.
Why does my kg scale show different readings each time?
Minor variations (0.5–1 kg) are normal and reflect hydration levels, food intake, bowel movements, and hormonal changes. Always weigh yourself under the same conditions: same time of day, same clothing, same scale. This reduces variation and makes measurements comparable over time.
What's a healthy weight in kg for my height?
Use our free BMI calculator above to find your healthy weight range based on your height and personal health profile. As a general guide, a healthy BMI of 18.5–24.9 corresponds to different kg weights for different heights. Your GP can also advise you on a healthy target weight.
How do I convert my kg scale reading to stone?
Divide your kg reading by 6.35 to convert to stone. For example, 70 kg ÷ 6.35 = 11 stone. Try our free weight converter on this page for instant conversions between kg, stone, and pounds—useful if you prefer imperial measurements.
Should I use my kg scale if I'm taking weight loss medication?
Yes, regular kg scale measurements are helpful when taking prescription weight loss medication. Record weekly readings in our progress tracker to monitor results alongside lifestyle changes. Your prescriber will also track your weight during treatment to assess progress and adjust doses if needed.
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.