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 is 66kg in Stone?
66kg is equivalent to 10 stone and 5.5 pounds (10st 5.5lbs). In the UK, we commonly use stone and pounds for body weight, so converting between kilograms and stone is useful for understanding your weight in familiar terms. Our free weight converter above can convert any weight instantly between kg, stone, and pounds. For context on what this weight means for your health, it's helpful to know your height and check your BMI using NHS guidelines.
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.
UK Health Context for 66kg
At 66kg, whether your weight is healthy depends entirely on your height and individual health circumstances. According to NHS guidance, a healthy BMI range is 18.5 to 24.9 for most adults — though lower thresholds (18.5–22.9) apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage, as these groups face higher health risks at lower BMI levels.
- At 5ft 6in (168cm), 66kg gives a BMI of 21.3 — within the healthy range
- At 5ft 2in (157cm), 66kg gives a BMI of 27 — overweight category
- At 5ft 10in (178cm), 66kg gives a BMI of 19.1 — healthy weight
Use our free BMI calculator above to check your personal BMI based on your exact height and weight. Your GP can also provide personalised guidance about what your weight means for your individual health.
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.
UK Health Resources and Next Steps
If you're concerned about your weight, the NHS offers free support through its tiered weight management pathway. Start by speaking with your GP, who can assess your overall health and refer you to appropriate services if needed. The NHS Weight Loss Plan provides evidence-based guidance on sustainable nutrition and physical activity.
You can also use our free progress tracker to log your weight over time and identify trends. Remember that weight fluctuates naturally based on hydration, hormones, and food intake — what matters most is sustainable, healthy habits rather than day-to-day changes. Your GP is the best source of personalised advice for your situation.
- 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, your BMI could be anywhere from healthy to overweight depending on how tall you are. Use the BMI calculator above with your height to see your personal BMI category according to NHS guidelines. Your GP can give you personalised advice.
How do I convert 66kg to pounds?
66kg equals approximately 145.5 pounds. You can convert any weight instantly using our free weight converter on this page. The exact conversion is kg × 2.20462 = pounds.
What is 66kg in stone and pounds?
66kg is 10 stone and 5.5 pounds (often written as 10st 5.5lbs). This is the standard way UK adults express body weight. Our weight converter above can convert between all three units instantly.
Should I try to lose weight if I'm 66kg?
This is a personal question best discussed with your GP, as it depends on your height, health conditions, and individual circumstances. Your GP can assess whether weight loss would benefit your health and recommend appropriate support options.
Where can I get NHS weight management support?
Contact your GP to discuss weight management. The NHS offers free support through its weight management pathway, starting with tier 1 self-help resources, and escalating to specialist services if needed. Waiting times vary by region (ICB area).
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.