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 Kg Weight and Your Health
Kilogrammes (kg) is the standard metric unit for measuring body weight used by the NHS and most health professionals across the UK. Whilst many UK adults prefer to think in stone and pounds, understanding your weight in kg is important for accessing health guidance, calculating BMI, and tracking progress with weight management. This guide explains kg weight, how to convert it to UK measurements, and what your weight means for your health using NHS thresholds.
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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.
Converting Kg to UK Measurements
The UK uses a mixed system for weight — whilst healthcare professionals use kilograms, many adults still prefer stone and pounds. Understanding both is helpful for healthy weight UK conversations with your GP.
- 1 kg = 0.157 stone (or 2.20 pounds)
- 1 stone = 6.35 kg exactly
- 1 pound = 0.454 kg
For example, 70 kg equals 11 stone (154 lbs). Use our free weight converter above to instantly switch between kg, stone, and pounds. This makes it easy to understand your weight in whichever measurement feels natural to you, whether you're reading NHS guidance (which uses kg) or discussing your weight with family and friends (who may use stone).
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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.
Kg Weight and NHS Health Thresholds
The NHS uses kg to define healthy weight ranges based on your height via BMI (Body Mass Index). According to nhs guidance, a healthy BMI is 18.5 to 24.9, which translates to different kg weights depending on your height.
For instance, a person who is 5ft 8in (173 cm) tall has a healthy weight range of approximately 55–74 kg (8st 9lbs to 11st 10lbs). Our free bmi calculator above shows your personal BMI instantly and tells you where your kg weight falls on the NHS scale. You can also use our weight converter to see your target healthy weight range in both metric and imperial measurements.
Weight management in the UK context often involves understanding your kg weight relative to NHS categories. Being overweight (BMI 25–29.9) or obese (BMI 30+) increases health risks including type 2 diabetes, high blood pressure, and heart disease. Even a modest 5–10% reduction in kg weight can improve health markers. If you're interested in exploring prescription weight management options alongside lifestyle changes, speak to your GP about referral to specialist services or discuss eligibility for medications like Mounjaro or Wegovy — both require clinical assessment and are prescription-only.
- 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 does kg weight mean in the UK context?
Kg (kilogrammes) is the metric unit used by the NHS and UK health professionals to measure body weight. Whilst many UK adults think in stone and pounds, NHS guidance uses kg to define healthy weight ranges and calculate BMI. Understanding both measurements helps you interpret health advice and track progress.
How do I convert my kg weight to stone and pounds?
Divide your kg by 6.35 to get stone, or multiply by 2.20 to get pounds. For example, 70 kg ÷ 6.35 = 11 stone. Use our free weight converter above for instant conversions across all three measurements without a UK pharmacy calculation.
What is a healthy kg weight according to the NHS?
Healthy weight depends on your height and is defined by BMI (18.5–24.9). For a 5ft 8in adult, healthy weight is roughly 55–74 kg. Use our BMI calculator above to check your personal healthy range based on your exact height and current weight.
Does my kg weight alone determine if I'm overweight?
No. Your kg weight must be assessed against your height using BMI. BMI doesn't distinguish between muscle and fat, so it's one tool among others. Waist circumference and body composition also matter. Your GP can provide personalised health advice about your kg weight.
Can I track my kg weight loss using MyWeightCheck tools?
Yes. Our free progress tracker allows you to log your weight in kg, stone, or pounds and see trends over time. Combined with our BMI calculator and weight converter, you can monitor both your absolute weight loss and changes in your BMI as you progress toward your health goals.
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.