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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Age Height And Weight Table — What's Healthy For You?
An age height and weight table helps you understand what a healthy weight range is for your height, age, and body type. In the UK, the NHS uses BMI (body mass index) as the primary screening tool to assess whether a weight is healthy, rather than age-specific tables. However, your age, height, metabolism, and individual health factors all matter when considering healthy weight management. This guide explains how to use height and weight information alongside NHS guidance to make sense of what's healthy for you.
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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.
How Height And Weight Relate To Healthy Weight
The NHS defines a healthy weight range using BMI categories rather than fixed weight-for-age tables. Your healthy weight depends primarily on your height, not your age. For example, a woman who is 5ft 5in (165cm) tall has a healthy weight range of approximately 8st 8lbs to 11st 7lbs (55–74kg), regardless of whether she is 25 or 55 years old.
However, age does matter indirectly: as we age, we naturally lose muscle mass and may need fewer calories, making weight maintenance more challenging. The NHS recommends using our free BMI calculator to establish your personal healthy weight range based on your height, then working with your GP if you have concerns about your weight or health.
- Healthy BMI range: 18.5–24.9 for most adults
- For South Asian, Chinese, Black African, or Caribbean adults: 18.5–22.9 (lower thresholds apply)
- Weight management is about sustainable habits, not age-specific targets
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 Height And Weight In The UK Context
In the UK, height is typically measured in feet and inches, while weight is expressed in stone and pounds (or kilograms). Using our free weight converter, you can instantly switch between these units to compare yourself against NHS guidance.
Rather than relying on generic age-height-weight tables—which can vary widely depending on frame size, muscle mass, and individual genetics—the NHS approach is more practical: calculate your BMI using your height and current weight, then discuss the result with your GP if you have questions. Your GP can consider your individual health history, medications, and circumstances to give personalised guidance that a standard table cannot provide.
- 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 there a UK age height and weight table that tells me exactly what I should weigh?
The NHS does not publish fixed age-based weight tables. Instead, healthy weight is determined by BMI relative to height. Use the free BMI calculator on this page to find your healthy weight range based on your height alone. Your GP can discuss whether your individual weight is healthy for your circumstances.
Does age affect what a healthy weight is?
Age does not change the BMI formula, so a healthy weight range for a given height is the same at 25 and at 65. However, age affects metabolism and muscle mass. Older adults may need fewer calories but still aim for the same BMI range. Discuss age-related weight changes with your GP if concerned.
What's the healthy weight range for a 5ft 8in (173cm) adult in the UK?
For someone 5ft 8in tall, the healthy weight range is approximately 8st 3lbs to 11st 3lbs (52–71kg). This applies regardless of age. Use the weight converter to switch between stone and kilograms, and the BMI calculator to check your personal BMI.
Why does the NHS use BMI instead of age-height-weight tables?
BMI is a screening tool that works for most adults and is evidence-based. Age-weight tables don't account for muscle mass, frame size, or individual differences. The NHS recommends BMI as the starting point; your GP can then consider your full health picture for personalised advice.
Should I aim for a different weight if I'm over 50?
Not necessarily—the healthy BMI range remains 18.5–24.9 at any age. However, maintaining muscle mass becomes more important as you age. Focus on strength training and adequate protein alongside a healthy diet. Your GP can advise if age-related changes affect your weight management approach.
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.