Determine your healthy weight range using standard medical formulas adapted for UK measurements.
Find your ideal weight in stones, pounds, and kilograms instantly.
Biological sex affects bone density and muscle mass calculations.
Feet
Inches
Please enter a valid height.
Centimeters
Please enter a valid height.
BMI Healthy Range (WHO Standard)
Devine Formula (1974) – Most Common
Robinson Formula (1983)
Miller Formula (1983)
Select the medical formula used to estimate ideal body weight.
Your Estimated Ideal Weight
10st 11lbs – 14st 10lbs
(68.5 kg – 93.4 kg)
Target BMI Range
18.5 – 24.9
Devine Ideal Weight
11st 5lbs
Robinson Ideal Weight
11st 2lbs
Healthy BMI RangeSpecific Formulas
Formula / Method
Weight (Stones/Lbs)
Weight (Kg)
What is My Ideal Weight Calculator UK?
The my ideal weight calculator uk is a specialized tool designed to help individuals determine a healthy body weight range based on their height and gender. Unlike generic calculators that often only provide results in kilograms or pounds, this tool is specifically adapted for UK users, offering results in the traditional stones and pounds format alongside metric values.
Knowing your ideal weight is a fundamental aspect of health management. It helps in setting realistic fitness goals, monitoring nutritional status, and assessing the risk of weight-related health conditions such as cardiovascular disease or diabetes. This calculator utilizes medically recognized formulas—including the Devine, Robinson, and Miller equations—alongside the World Health Organization's Body Mass Index (BMI) standards to provide a comprehensive view of where your weight should ideally sit.
It is important to note that "ideal weight" is a statistical estimate. It does not account for muscle mass, bone density, or body composition distribution. Therefore, athletes or individuals with high muscle mass may find their "ideal" weight differs from these calculations.
My Ideal Weight Calculator UK Formula and Mathematical Explanation
Calculating ideal body weight (IBW) is not a one-size-fits-all process. Over the decades, medical researchers have developed several formulas. The my ideal weight calculator uk employs the most widely accepted ones to give you a robust estimate.
1. The Devine Formula (1974)
Originally developed to calculate drug dosages, this is the most commonly used formula for IBW.
Men: 50.0 kg + 2.3 kg per inch over 5 feet
Women: 45.5 kg + 2.3 kg per inch over 5 feet
2. The Robinson Formula (1983)
A modification of the Devine formula, often used for slightly different population averages.
Men: 52.0 kg + 1.9 kg per inch over 5 feet
Women: 49.0 kg + 1.7 kg per inch over 5 feet
3. BMI Method (WHO Standard)
The Body Mass Index (BMI) method calculates a weight range rather than a single number. A healthy BMI is considered to be between 18.5 and 24.9.
Formula: Weight = BMI × (Height in meters)²
Variables Table
Variable
Meaning
Unit
Typical Range
Height
Vertical measurement of the body
ft/in or cm
4'10" – 6'10"
Base Weight
Starting constant for calculation
kg
45.5 – 56.2 kg
Increment
Weight added per inch over 5ft
kg/inch
1.36 – 2.3 kg
BMI
Body Mass Index
kg/m²
18.5 – 24.9 (Healthy)
Practical Examples (Real-World Use Cases)
Example 1: The Average UK Male
Consider John, who is 5ft 10in (178 cm) tall. He wants to know his ideal weight using the my ideal weight calculator uk.
BMI Range: A healthy weight range for Sarah is between 7st 2lbs and 9st 9lbs.
Interpretation: The Robinson formula suggests a lighter target (8st 3lbs) compared to the upper limit of the BMI scale, giving Sarah a precise goal for optimal health.
How to Use This My Ideal Weight Calculator UK
Using this tool is straightforward. Follow these steps to get accurate results:
Select Units: Choose "Imperial" if you know your height in feet and inches, or "Metric" for centimeters.
Select Gender: Choose Male or Female. This adjusts the base weight and increment values in the formulas.
Enter Height: Input your height accurately. For the most precise results, measure yourself without shoes against a flat wall.
Choose Formula (Optional): The calculator defaults to the BMI range, but you can select specific formulas like Devine or Robinson to see a single target number.
Review Results: The large highlighted box shows your primary result. The table below breaks down different formulas, and the chart visualizes your healthy range.
Decision Making: If you are currently outside the calculated range, use this data to discuss a safe weight management plan with your GP or a dietitian.
Key Factors That Affect My Ideal Weight Calculator UK Results
While the my ideal weight calculator uk provides a scientific estimate, several biological and lifestyle factors influence what your true "ideal" weight should be.
1. Muscle Mass vs. Body Fat
Muscle tissue is denser than fat. An athletic individual may weigh more than the calculator suggests but still be healthy. The calculator does not distinguish between 12 stone of muscle and 12 stone of fat.
2. Bone Density (Frame Size)
People with larger bone structures (large frame) naturally weigh more. Some variations of ideal weight formulas adjust for frame size, allowing for a 10% variation above or below the standard result.
3. Age
As we age, muscle mass tends to decrease and fat accumulation shifts. While the formulas don't explicitly change with age, older adults are often advised to maintain a weight slightly higher in the healthy range to provide a buffer against illness.
4. Height Accuracy
Even a one-inch difference can shift the ideal weight calculation by over 2kg (approx 5lbs). Accurate measurement is critical for valid results.
5. Gender Differences
Men generally have more muscle mass and heavier skeletons than women. This is why the formulas have different base weights (e.g., 50kg for men vs 45.5kg for women in the Devine formula).
6. Health Conditions
Certain conditions like fluid retention (edema) or pregnancy render standard weight calculators inaccurate. In these cases, medical supervision is required to determine a healthy weight target.
Frequently Asked Questions (FAQ)
1. Is the my ideal weight calculator uk accurate for children?
No. Children and teenagers are still growing, and their healthy weight is determined using growth charts (centiles) rather than adult formulas. Consult a pediatrician for under-18s.
2. Why does the calculator give me a range instead of one number?
A single number is rarely realistic. A "healthy range" (based on BMI) accounts for natural fluctuations in hydration, digestion, and minor body composition differences.
3. Which formula is the best?
The Devine formula is the most widely used in medical settings. However, the BMI range is the official standard used by the NHS and WHO for general health assessment.
4. What is 10 stone in kg?
10 stone is approximately 63.5 kg. Our calculator handles these conversions automatically so you don't have to do the math.
5. Does this calculator measure body fat?
No, it only measures weight relative to height. To measure body fat percentage, you would need calipers, a DEXA scan, or a bioimpedance scale.
6. I am a bodybuilder, should I use this?
Likely not. Bodybuilders often have high BMIs due to muscle mass, which these formulas might misinterpret as being overweight. A body fat percentage test is better for you.
7. How often should I check my ideal weight?
Adult height rarely changes, so your ideal weight calculation remains constant. However, you should weigh yourself weekly to see how close you are to your target.
8. Is being under the ideal weight dangerous?
Yes. Being underweight can lead to a weakened immune system, osteoporosis, and nutritional deficiencies. Aim to stay within the lower end of the healthy BMI range provided.
Related Tools and Internal Resources
Explore our other health and fitness tools to support your journey:
BMI Calculator – Calculate your Body Mass Index specifically.
Daily Calorie Needs – Find out how many calories you need to maintain or lose weight.