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
66.6 Kg To Stones And Pounds — Healthy Weight Guide
66.6 kg converts to 10 stone and 6.5 pounds in UK measurements. Whether this weight is healthy for you depends entirely on your height, age, and individual circumstances. Using our free BMI calculator above, you can instantly check where your weight falls on the NHS healthy weight scale. This guide shows you how to convert kilograms to stone, provides healthy weight ranges for different heights, and explains what the NHS recommends for maintaining a healthy weight.
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.
Healthy Weight Ranges By Height
At 66.6 kg (10 stone 6.5 lbs), whether you're in a healthy weight range depends on your height. The NHS healthy weight range is a BMI of 18.5 to 24.9 for most UK adults. Here are three practical examples:
- At 160 cm (5ft 3in): 66.6 kg gives a BMI of 26 — this is overweight. Healthy range: 47–63 kg (7st 6lbs to 9st 13lbs)
- At 170 cm (5ft 7in): 66.6 kg gives a BMI of 23 — this is healthy. Healthy range: 53–72 kg (8st 5lbs to 11st 5lbs)
- At 180 cm (5ft 11in): 66.6 kg gives a BMI of 20.5 — this is healthy. Healthy range: 60–81 kg (9st 6lbs to 12st 10lbs)
Use the metric to imperial weight conversion above to check your own height-to-weight ratio. The BMI calculator on this page will show your exact healthy weight range and current category.
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.
NHS Guidance And Next Steps
The NHS recommends checking your waist measurement as well as weight. A larger waist circumference (over 94 cm for men, over 80 cm for women) indicates higher health risk even at a healthy BMI. If your weight is outside the healthy range for your height, the NHS advises focusing on sustainable lifestyle changes: a balanced diet, regular physical activity, and realistic goals of 0.5–1 kg per week weight loss. Your GP can provide personalised advice about your health and whether any intervention is needed. Remember, weight is influenced by many factors including genetics, medications, and medical conditions — a single number doesn't define your 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.
How do I convert 66.6 kg to stones and pounds exactly?
66.6 kg equals 10 stone and 6.5 pounds (10st 6.5lbs). To convert any kilogram to stone and pounds, divide kg by 6.35 for stone, then multiply the decimal remainder by 14 for pounds. You can also use our free weight converter above for instant conversions between kg, stone, and lbs.
Is 66.6 kg a healthy weight for everyone?
No — it depends on your height, age, sex, and muscle mass. At 170 cm it's likely healthy (BMI ~23), but at 160 cm it's overweight (BMI ~26). Use the BMI calculator on this page to check your personal healthy weight range based on your exact height.
What should I do if I'm outside my healthy weight range?
The NHS recommends consulting your GP for personalised guidance. Sustainable approaches include a balanced diet, 150 minutes of weekly physical activity, and aiming for 0.5–1 kg weight loss per week. Small lifestyle changes often have significant health benefits without extreme measures.
How does stone and pounds compare to kg in the UK?
Stone is the traditional UK measurement for body weight, though NHS clinical records use kilograms. One stone equals 6.35 kg or 14 pounds exactly. Most UK adults still refer to their weight in stones, while health professionals use kg for consistency. Our weight converter helps switch between all three units instantly.
What does BMI tell me about my health?
BMI is a useful screening tool showing whether your weight falls in a healthy range for your height. However, it has limitations — it doesn't account for muscle mass, bone density, or where fat is stored. Your GP can assess your overall health using BMI alongside waist measurement, fitness level, and medical history.
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.