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
Weight Converter Calculator — Convert kg, Stone & Pounds
A weight converter calculator is an essential tool for anyone managing their health in the UK, where weight is commonly expressed in stone and pounds, yet medical professionals use kilograms. Whether you're tracking weight loss, checking your BMI, or following weight management guidance from your GP, converting between units quickly and accurately is vital. Our free weight converter above helps you switch between kg, stone, and pounds instantly, giving you immediate clarity on your weight in the measurement system you prefer.
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.
How Weight Conversion Works in the UK
The UK uses a unique mix of metric and imperial measurements for weight. While the NHS and medical professionals use kilograms (kg), most UK adults prefer to discuss their weight in stone and pounds — a tradition that remains deeply embedded in British culture. Understanding these conversions is important for health management.
- 1 kilogram = 0.157 stone (or 2.2 pounds)
- 1 stone = 6.35 kilograms
- 1 stone = 14 pounds exactly
For example, 70kg converts to 11 stone 0.1 pounds. Medical BMI charts use kg, but knowing your weight in stone helps you relate to NHS healthy weight guidance and understand your health context. Use our free weight converter above to switch between any units instantly.
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.
Using Weight Conversion for Health Management
Converting your weight is more than just changing units — it's about understanding your health in context. Once you know your weight in kg, use our free BMI calculator to check where you sit on the NHS healthy weight scale. A healthy BMI ranges from 18.5 to 24.9 for most UK adults, though South Asian, Chinese, Black African, and Black Caribbean adults have lower thresholds (18.5 to 22.9).
If you're tracking weight loss or considering weight management options, our weight converter works alongside our GLP-1 weight loss calculator, which can help you project potential outcomes if you're exploring prescription weight loss options. Combined with our progress tracker, these free tools give you a complete picture of your health journey in measurements that make sense to you.
- 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.
Why do UK doctors use kg when we talk about weight in stone?
The NHS adopted metric measurements for clinical consistency and accuracy. Kilograms are the international standard in medicine, making it easier to compare health data across countries and follow evidence-based guidance. However, many UK adults still prefer stone and pounds for everyday conversation — which is why weight converters are so useful.
Is 70kg a healthy weight?
That depends on your height. At 70kg, if you're 1.73m tall (5ft 8in), your BMI would be approximately 23.4 — which falls in the healthy weight range (18.5–24.9). Use our free BMI calculator above to check your personal healthy weight range based on your exact height and weight.
What's the difference between stone and pounds?
Stone and pounds are both imperial measurements. One stone equals exactly 14 pounds. So 12 stone 7 pounds is the same as 175 pounds total. Our weight converter handles these conversions automatically, letting you switch seamlessly between stone, pounds, and kilograms.
How accurate are online weight converters?
Mathematical weight converters are 100% accurate — they use fixed conversion formulas. One kg always equals 2.20462 pounds and 0.157473 stone. The only variation comes from rounding to sensible decimal places. Our converter uses standard UK rounding conventions.
Should I track my weight loss in kg or stone?
Use whichever unit feels most natural to you. Some people prefer kg because it shows smaller, measurable weekly changes (0.5kg loss feels significant). Others prefer stone because larger numbers feel more rewarding. Our progress tracker lets you log in any unit — consistency matters more than choice.
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.