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
How Much Is 66kg In Stone?
66 kilograms is equivalent to 10 stone and 5.3 pounds in UK measurements. This conversion uses the standard metric-to-imperial formula where 1 stone equals 6.35029 kg. If you're checking your weight in different units or comparing against NHS health guidance, our free weight converter above makes it easy to switch between kg, stone, and pounds instantly. Understanding your weight in the measurement system you're most comfortable with is an important part of tracking your health.
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.
What Does 66kg Mean For Your Health?
At 66kg, whether this is a healthy weight depends on your height and individual circumstances. Using NHS health guidance, you can check your BMI to understand where your weight sits. For example, a person who is 5 feet 6 inches (168cm) tall with a weight of 66kg would have a BMI of approximately 21.3, which falls in the healthy weight range according to NHS guidelines (18.5 to 24.9). However, if you're taller or shorter, your BMI will be different. Our free BMI calculator on this page instantly shows your personal BMI and where it sits against NHS thresholds. Remember that BMI is a screening tool — it doesn't account for muscle mass or where fat is stored, so it's always worth discussing your personal health with your GP alongside any BMI result.
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.
Converting 66kg to Stone & Other Measurements
Using the standard conversion formula: 66kg ÷ 6.35029 = 10.4 stone (or 10 stone 5.3lbs). Some people find it helpful to remember that 1 stone always equals exactly 14 pounds, making it easy to calculate the pounds portion. If you work with healthcare professionals or follow UK weight management programmes, you'll often see both kilograms and stone used interchangeably. Our weight converter tool above lets you convert between any measurements — whether you're tracking progress, comparing NHS data, or simply prefer working in different units. Quick reference: 66kg is also 145.5 pounds if you need imperial pounds 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.
Is 66kg a healthy weight?
It depends on your height. At 66kg, calculate your BMI using our free BMI calculator above to see if you're in the healthy range (18.5–24.9 according to NHS guidelines). For example, someone 5ft 6in tall at 66kg has a BMI of about 21.3, which is healthy. Discuss any concerns with your GP.
How do I convert 66kg to stone and pounds?
Divide 66kg by 6.35029 to get stone: 66 ÷ 6.35029 = 10.4 stone, which is 10 stone 5.3lbs. Use our free weight converter on this page for instant conversions between kg, stone, and pounds.
What's the difference between stone and kilograms?
Stone and kilograms are both units of weight. The UK predominantly uses stone and pounds for body weight, while kilogrammes are used in healthcare and most of Europe. 1 stone = 6.35029 kg exactly. Both are equally valid — choose whichever you're most comfortable with.
How does 66kg compare to average UK weight?
According to ONS data, the average UK adult woman weighs about 71.6kg (11st 3lbs) and the average UK adult man weighs about 85.7kg (13st 7lbs). At 66kg, you're below the average for men and slightly below average for women, though healthy weight varies by height and individual health.
Should I lose weight if I'm 66kg?
Weight management is personal and depends on your height, BMI, age, and health conditions. Check your BMI using our free calculator on this page, and discuss any concerns with your GP. They can advise on whether weight loss is appropriate for your individual circumstances.
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.