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
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What Is 66.6kg in Stone and Pounds?
66.6 kilograms is equal to 10 stone and 6.8 pounds (or approximately 10st 7lbs in everyday terms). This is a straightforward metric to imperial conversion used throughout the UK. Whether you're checking your weight on a metric scale or comparing health information, understanding how to convert kilograms to stone is helpful. You can use our free weight converter above to switch between metric and imperial measurements instantly, or follow the simple conversion formula below.
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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.
66.6kg Weight Conversion Table and Formula
To convert 66.6kg to stone and pounds, use this standard kilogram to stone conversion formula:
- Divide kg by 6.35029 to get stone: 66.6 ÷ 6.35029 = 10.498 stone
- Multiply the decimal by 14 to get pounds: 0.498 × 14 = 6.97 pounds
- Result: 10 stone 6.97 pounds (rounded to 10st 7lbs)
The table below shows how 66.6kg compares to nearby weight values. This helps you see the conversion in context across a range of common weights used in UK health assessments and personal weigh-ins.
| Kilograms | Stone | Pounds |
| 61.6 | 9st 9.3lbs | 135.8 |
| 63.6 | 10st 0.1lbs | 140.1 |
| 65.6 | 10st 5lbs | 144.6 |
| 66.6 | 10st 6.8lbs | 146.8 |
| 67.6 | 10st 8.6lbs | 149.0 |
| 69.6 | 10st 13.4lbs | 153.4 |
| 71.6 | 11st 3.2lbs | 157.8 |
Clinically BackedWeight Loss
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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.
66.6kg BMI and Healthy Weight Context
At 66.6kg, your BMI depends on your height. For example, at an average UK height of 1.70m (5ft 7in), a weight of 66.6kg gives a BMI of approximately 23.0 — which falls in the healthy weight range according to NHS guidelines (18.5–24.9). At 1.75m (5ft 9in), the BMI would be 21.8, also healthy. If you're taller or shorter, your BMI will differ. Use our free BMI calculator above to check your personal BMI instantly. Even small lifestyle changes like increasing daily activity or adjusting portions can support long-term weight management and overall health.
- 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 66.6kg a healthy weight?
It depends on your height and age. At average UK heights (5ft 7–9in), 66.6kg typically results in a healthy BMI of 21–23. Use our free BMI calculator to check your specific BMI. Your GP can also advise on what weight range is healthy for you personally.
How do I convert kilograms to stone quickly?
Divide kilograms by 6.35029 to get stone, then multiply any decimal by 14 to get pounds. For 66.6kg: 66.6 ÷ 6.35029 = 10.5 stone = 10st 7lbs. Our weight converter tool does this instantly.
What's the difference between stone and pounds?
One stone equals exactly 14 pounds. Stone is used in the UK for body weight; pounds are smaller units. 66.6kg = 10 stone 7 pounds, meaning 10 full stones plus 7 individual pounds on top.
How does 66.6kg compare to average UK weight?
The average UK adult woman weighs approximately 71.6kg and the average man weighs 85.7kg. At 66.6kg, you weigh slightly less than the average woman, though healthy weight varies widely by height and build.
Can I use this conversion for health assessments?
Yes. NHS health records and fitness trackers often use kg, but UK adults typically discuss weight in stone. Converting 66.6kg to stone (10st 7lbs) helps you compare with UK health guidelines and personal benchmarks accurately.
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.