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 70kg Overweight? Find Out With Your BMI
Whether 70kg is considered overweight depends on your height and overall health profile. The NHS uses BMI (Body Mass Index) as the primary screening tool to determine if you're in a healthy weight range. At 70kg, you may be overweight, at a healthy weight, or underweight — it all depends on how tall you are. Use our free BMI calculator above to check instantly, then read on to understand what your result means according to NHS guidelines for UK adults.
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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.
NHS BMI Categories and Overweight Thresholds
The NHS classifies overweight as a BMI between 25.0 and 29.9. If your BMI falls into this range, you're in the overweight category. Beyond that, a BMI of 30.0 or above is classified as obese.
- Healthy weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese (Class I): BMI 30.0–34.9
- Obese (Class II): BMI 35.0–39.9
- Severely obese (Class III): BMI 40.0+
For example, if you're 173cm (5ft 8in) tall and weigh 70kg (11 stone), your BMI is approximately 23.4 — which falls in the healthy weight range. However, if you're 160cm (5ft 3in) tall and weigh 70kg, your BMI is around 27.3 — which is in the overweight category. This shows why height matters so much when assessing weight health.
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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.
What to Do If You're Overweight: Next Steps
If your BMI calculation shows you're overweight, there are several practical steps you can take. First, measure your waist circumference — the NHS recommends keeping it below 80cm (31.5 inches) for women and 94cm (37 inches) for men. A larger waist can indicate excess abdominal fat, which carries higher health risks even if your BMI seems borderline.
Next, speak with your GP about your weight and overall health. They can assess whether you'd benefit from lifestyle changes such as a balanced diet and regular physical activity, or if you might be eligible for support through NHS weight management services. Even a modest 5–clinically studied weight loss can bring meaningful health improvements.
- 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 70kg (11 stone) a healthy weight?
It depends entirely on your height. At 70kg, use our free BMI calculator above to determine your personal BMI. If you're around 173cm (5ft 8in) tall, 70kg is healthy. If you're shorter, such as 160cm (5ft 3in), 70kg would be overweight according to NHS thresholds. BMI is the standard NHS screening tool for adults.
What is the difference between overweight and obese?
The NHS classifies overweight as a BMI of 25.0–29.9 and obese as BMI 30.0 or above. Obesity is further divided into Class I (30.0–34.9), Class II (35.0–39.9), and Class III (40.0+). These categories help assess health risk, though BMI has limitations and doesn't account for muscle mass.
Is waist measurement important if my BMI is healthy?
Yes. Even at a healthy BMI, where you carry fat matters. The NHS recommends measuring waist circumference: below 80cm (31.5in) for women and 94cm (37in) for men indicates lower risk. Excess abdominal fat carries greater health risks than fat stored elsewhere, so waist measurement complements BMI assessment.
What health risks are linked to being overweight?
Being overweight increases the risk of type 2 diabetes, high blood pressure, heart disease, and certain cancers. Even modest weight loss of 5–10% can reduce these risks significantly. Your GP can discuss personalised health recommendations based on your individual circumstances and any existing health conditions.
Should I see my GP about my weight?
Yes. Your GP can provide personalised advice about whether your weight poses health risks based on your full health picture, family history, and any existing conditions. They can also signpost you to NHS weight management programmes or discuss lifestyle changes that may be appropriate for you.
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.