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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66.6 Kg To Lbs — Is This A Healthy Weight?
66.6 kilograms equals 146.8 pounds (or 10 stone 6.8 lbs in traditional UK measurements). Whether this is a healthy weight depends entirely on your height, age, and overall health profile. The NHS uses BMI to assess whether a weight falls within a healthy range, but BMI varies significantly based on your height. This guide shows you how to interpret your weight in context and what the NHS recommends for your personal situation.
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 (146.8 lbs), your healthy weight status depends on your height. Use our free BMI calculator above to check your personal BMI instantly — this gives the clearest picture of whether 66.6 kg is healthy for you. Here are three real examples:
- At 5ft 2in (157 cm): 66.6 kg gives a BMI of 27.1 — this is overweight (NHS healthy range is 18.5–24.9). Healthy weight range: 45–59 kg (99–130 lbs).
- At 5ft 6in (168 cm): 66.6 kg gives a BMI of 23.6 — this is within the healthy weight range. Healthy weight range: 52–70 kg (115–154 lbs).
- At 5ft 10in (178 cm): 66.6 kg gives a BMI of 21.1 — this is comfortably within the healthy range. Healthy weight range: 59–79 kg (130–174 lbs).
The same weight can be healthy or overweight depending on your height. Convert your weight using our free weight converter to see your measurements in stone, lbs, and kg side by side.
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.
NHS Guidance And What To Do Next
The NHS recommends a healthy BMI of 18.5–24.9 for most UK adults. If you have a South Asian, Chinese, Black African, or Black Caribbean background, your GP may suggest lower thresholds (18.5–22.9) because these groups face higher health risks at the same BMI. Alongside BMI, waist measurement matters: men should aim for under 94 cm (37 inches), women under 80 cm (31.5 inches). If 66.6 kg puts you outside a healthy range for your height, your GP can suggest sustainable approaches — whether dietary changes, activity increases, or other support. Weight is just one aspect of health, and many factors influence it. Always discuss your personal situation with your GP or use our free BMI calculator to assess your individual risk profile.
- 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 66.6 kg (146.8 lbs) overweight?
It depends on your height. At 5ft 2in, it's overweight. At 5ft 6in or taller, it falls within or near the healthy range. Use the BMI calculator on this page to check your personal BMI — this gives a definitive answer based on your exact height and weight.
What is the healthy weight range at 66.6 kg?
If your height means 66.6 kg is within your healthy BMI range (18.5–24.9), then it's healthy for you. If your BMI is above 24.9, a healthy target would be lower. Your GP can help personalise this — individual health, muscle mass, and frame size all matter.
How do I convert 66.6 kg to stone and pounds?
66.6 kg equals 10 stone 6.8 pounds (or 146.8 lbs). Use our free weight converter above to check conversions between kg, stone, and lbs instantly.
What should I do if 66.6 kg is outside a healthy range for my height?
Talk to your GP. Sustainable weight loss of 0.5–1 kg per week is recommended by the NHS. Your GP can suggest dietary approaches, activity increases, or other support tailored to your health. Small changes often lead to lasting results.
Does BMI tell the whole story about weight and health?
BMI is useful but has limitations — it doesn't account for muscle mass, where fat is stored, or medical conditions. Waist measurement is equally important. Your GP can assess your individual health picture beyond BMI alone.
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.