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
Is 66.5 kg a Healthy Weight?
66.5 kg is equivalent to approximately 146.6 pounds, but whether this weight is healthy depends entirely on your height. The NHS uses BMI (body mass index) to assess healthy weight ranges, and a weight of 66.5 kg can fall anywhere from the healthy range to overweight, depending on how tall you are. Use our free BMI calculator above to find your personal BMI instantly, or read on to see how 66.5 kg compares to NHS healthy weight guidelines for different heights.
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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.
Healthy Weight Ranges by Height
At 66.5 kg, your weight falls into different NHS categories depending on your height. Here's how to assess whether it's healthy for you:
- At 160 cm (5ft 3in): 66.5 kg gives a BMI of 26, which falls in the overweight range (25–29.9). Healthy weight at this height is 47–64 kg.
- At 170 cm (5ft 7in): 66.5 kg gives a BMI of 23, which falls in the healthy range (18.5–24.9). Healthy weight at this height is 53–72 kg.
- At 180 cm (5ft 11in): 66.5 kg gives a BMI of 20.5, which falls in the healthy range (18.5–24.9). Healthy weight at this height is 60–80 kg.
To convert your weight between kilograms and stone, or to find your exact healthy weight range, use our free weight converter above. For a more detailed assessment, calculate your BMI using the metric to imperial weight conversions — your height makes all the difference.
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 Next Steps
The NHS recommends a healthy BMI of 18.5 to 24.9 for most UK adults. If 66.5 kg puts you in the overweight range (BMI 25–29.9), the good news is that even modest weight loss—as little as 5–10% of your body weight—can have significant health benefits including lower blood pressure and improved blood sugar control.
Beyond BMI, the NHS also recommends checking your waist circumference: over 94 cm for men or 80 cm for women indicates increased health risk. If you're concerned about whether your weight is healthy for you, your GP can provide personalised guidance. Track your progress with our free progress tracker to monitor changes over time.
- 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.
What is 66.5 kg in stone and pounds?
66.5 kg equals approximately 10 stone 6.2 pounds (10st 6lbs). To understand whether this weight is healthy for your height, use our free weight converter or BMI calculator above to check your personal BMI and healthy weight range according to NHS guidelines.
Is 66.5 kg overweight?
It depends on your height. At 160 cm, 66.5 kg is overweight (BMI 26). At 170 cm or taller, it falls within the healthy range. Use our BMI calculator to find out your personal BMI — enter your height and weight to see which category you fall into.
What's the healthy weight for my height?
Healthy weight ranges vary significantly by height. For example, at 165 cm (5ft 5in), healthy weight is 50–68 kg. At 175 cm (5ft 9in), it's 57–77 kg. Use our free BMI calculator above to enter your exact height and see your personal healthy weight range according to NHS guidelines.
How do I convert kilograms to pounds accurately?
The conversion is: 1 kg = 2.20462 pounds. So 66.5 kg × 2.20462 = 146.6 lbs. For quick conversions between kg, stone, and lbs, use our free weight converter — it handles all metric to imperial weight conversions instantly.
What should I do if my weight isn't in the healthy range?
If your BMI falls outside the healthy range, the NHS recommends starting with small, sustainable changes: aim to lose 0.5–1 kg per week through a reduced-calorie diet and increased physical activity. If you need support, your GP can refer you to weight management services. Track your progress with our free progress tracker.
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.