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's 66 Kilo in Stone and What Does It Mean for Your BMI?
66 kilograms equals 10 stone 5 pounds in UK measurements. However, your BMI at this weight depends entirely on your height — the same weight can be healthy for a taller person but overweight for someone shorter. Use our free BMI calculator above to find your exact BMI, or read on to see what 66kg means across different heights according to NHS guidelines.
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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.
66kg BMI at Different Heights
Here's what a weight of 66kg means for your BMI across common UK heights:
- 160cm (5ft 3in): BMI of 25.8 — overweight category
- 165cm (5ft 5in): BMI of 24.2 — healthy weight category
- 170cm (5ft 7in): BMI of 22.8 — healthy weight category
- 175cm (5ft 9in): BMI of 21.5 — healthy weight category
- 180cm (5ft 11in): BMI of 20.4 — healthy weight category
- 185cm (6ft 1in): BMI of 19.3 — healthy weight category
As you can see, 66kg is a healthy weight for most adults above 165cm tall, but falls into the overweight category for shorter individuals. Use our free weight converter to switch between kg, stone, and pounds if you need other measurements.
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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.
NHS BMI Categories and Limitations
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9. At 66kg, your category depends on your height, as shown above. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a higher BMI without excess body fat. It also doesn't account for age, bone density, or where fat is stored. Your GP can provide personalised advice about what your specific BMI means for your health, especially if you have weight-related health conditions or family history concerns.
- 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 66kg to stone and pounds?
66kg equals exactly 10 stone 5.1 pounds. To convert kg to stone, divide the kilogram value by 6.35029. For stone and pounds, first convert to stone (10.36), then multiply the decimal by 14 to get pounds (5.1 lbs).
Is 66kg a healthy weight?
At 66kg, whether you're at a healthy weight depends on your height. For heights above 165cm, it's likely a healthy weight. Below 165cm, it may be classed as overweight. Your GP or our BMI calculator can give you a personalised assessment.
What's the difference between BMI in kg and stone measurements?
BMI is calculated the same way regardless of units — weight divided by height squared. The weight unit (kg or stone) doesn't change the BMI result. Many UK people prefer seeing weight in stone, but BMI itself is universal.
Should I lose weight if I'm 66kg?
That depends on your individual height, health history, and whether you have weight-related health conditions. Only your GP can advise whether weight loss would benefit you. Use our free BMI calculator to see where you fall in NHS categories, then discuss with your doctor.
Can I track weight changes from 66kg using MyWeightCheck?
Yes. Our free progress tracker lets you log your weight in kg, stone, or pounds and monitor changes over time. You can also use our BMI calculator regularly to track how your BMI changes as your weight or fitness improves.
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.