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 66.5kg in Stones and Pounds?
66.5kg is equal to 10 stone 7.3 pounds (or 10st 7.3lbs). However, whether this weight is healthy for you depends entirely on your height. Use our free BMI calculator above to check your personal BMI instantly — it only takes seconds and will tell you whether 66.5kg falls into a healthy weight range for your specific height according to 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.
66.5kg BMI at Different Heights
66.5kg converts to 10 stone 7.3 pounds — but BMI depends on your height. Here's what BMI you'd have at common heights:
- At 160cm (5ft 3in): BMI of 25.9 — falls into the overweight category (25.0–29.9)
- At 165cm (5ft 5in): BMI of 24.4 — falls into the healthy weight category (18.5–24.9)
- At 170cm (5ft 7in): BMI of 23.0 — falls into the healthy weight category
- At 175cm (5ft 9in): BMI of 21.7 — falls into the healthy weight category
- At 180cm (5ft 11in): BMI of 20.5 — falls into the healthy weight category
Use the weight converter on this page to switch between kilograms, stone, and pounds for any weight you want to check.
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.
Understanding BMI Categories and Limitations
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9. The example BMI values above show that 66.5kg can be either healthy or overweight depending on your height — taller people will have a lower BMI at this weight. However, BMI has important limitations: it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite being fit. BMI also doesn't account for where fat is stored. Waist circumference and overall fitness matter too. If you're concerned about your weight and health, your GP can provide personalised advice based on your individual circumstances.
- 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 66.5kg to stone?
Divide 66.5 by 6.35029 to get 10.47 stone. This equals 10 stone 7.3 pounds (multiply the decimal 0.47 by 14 to get the pounds). Alternatively, use our free weight converter on this page — it converts kilograms to stone and pounds instantly.
Is 66.5kg a healthy weight?
It depends on your height. At 165cm or taller, 66.5kg typically gives a healthy BMI. At 160cm, it falls into the overweight category. Use our free BMI calculator above to check your personal BMI — it takes seconds and gives you an NHS-based assessment.
What's the healthy weight range for my height?
Your healthy weight range depends on your height. The NHS recommends a BMI between 18.5 and 24.9. For example, at 170cm, a healthy weight range is approximately 53.4kg to 71.6kg (roughly 8st 5lbs to 11st 3lbs). Calculate yours using our free BMI calculator on this page.
How do I use the weight converter?
Enter your weight in kilograms (or stone and pounds), and the converter instantly shows the equivalent in other units. It's perfect for comparing your weight across metric and imperial measurements — useful if you're tracking weight loss or checking NHS guidelines.
What should I do if my BMI is outside the healthy range?
If your BMI is above 25, speak with your GP. They can assess your individual health, discuss any weight-related concerns, and suggest appropriate support — which might include lifestyle changes, referral to specialist weight management services, or discussion of prescription weight loss options.
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.