About this Ideal Weight Calculator
The Ideal Weight Calculator in this script does not try to derive one universal body weight from height alone. It starts with the sex-specific Devine formula shown on the page, adjusts that estimate for the selected body-frame size, and then displays a broader range around the adjusted value.
For men, the source uses 50 + 0.9 × (Height in cm − 152); for women, it uses 45.5 + 0.9 × (Height in cm − 152). Small frame multiplies the estimate by 0.90, medium frame leaves it unchanged, and large frame multiplies it by 1.10.
The reference tables also place Devine estimates beside a wider healthy-BMI range and explicitly note that a range is more useful than treating one figure as a perfect target. Age is collected for guidance but, as the source states, it is not part of the weight formula itself.
The result is therefore a formula-based reference, not a direct measurement of body composition or individual health.
What Is an Ideal Weight Calculator?
An Ideal Weight Calculator applies a height-based reference equation and returns a single estimated weight plus the range defined by the page. In this script, the Devine formula provides the starting value according to sex. The selected body frame then adjusts that figure by minus 10%, no change, or plus 10%.
The source defines the displayed healthy range as 90% to 110% of the adjusted ideal weight. This construction is different from the Healthy Weight Calculator’s BMI-based range, even though the page’s reference tables show BMI ranges for comparison.
The output should therefore be understood as a Devine-and-frame estimate produced by the stated formula rather than an independently measured or clinically determined ideal body weight.
Reading Your Results
Your result shows an estimated ideal weight in kilograms or pounds based on your height and gender. Treat this as a general reference point rather than a strict target, since healthy weight also depends on frame size, muscle mass, and individual body composition.
How to use this calculator
The calculator determines your ideal weight using the Devine formula and shows your healthy weight range.
For Men (Devine Formula)
For Women (Devine Formula)
Body Frame Adjustment
Small Frame
Medium Frame
Large Frame
Healthy Weight Range
Where
Ideal Weight = Weight estimated using the Devine formula
Ideal Weight by Height (Male)
| Height | Devine Formula | Healthy BMI Range |
|---|---|---|
| 160 cm | 56.9 kg | 47 – 64 kg |
| 165 cm | 61.6 kg | 50 – 68 kg |
| 170 cm | 66.2 kg | 53 – 72 kg |
| 175 cm | 70.8 kg | 57 – 76 kg |
| 180 cm | 75.5 kg | 60 – 81 kg |
| 185 cm | 80.1 kg | 63 – 85 kg |
| 190 cm | 84.7 kg | 67 – 90 kg |
A healthy BMI range is broader and more useful than any single ideal weight figure.
Ideal Weight by Height (Female)
| Height | Devine Formula | Healthy BMI Range |
|---|---|---|
| 150 cm | 45.5 kg | 42 – 56 kg |
| 155 cm | 50.1 kg | 44 – 60 kg |
| 160 cm | 54.7 kg | 47 – 64 kg |
| 165 cm | 59.4 kg | 50 – 68 kg |
| 170 cm | 64.0 kg | 53 – 72 kg |
| 175 cm | 68.6 kg | 57 – 76 kg |
| 180 cm | 73.3 kg | 60 – 81 kg |
Formula weights are population averages and do not account for build or muscle mass.
Ideal Weight Formulas Compared
| Formula | Male Baseline | Female Baseline | Per Inch Over 5 ft |
|---|---|---|---|
| Devine (1974) | 50.0 kg | 45.5 kg | +2.3 kg |
| Robinson (1983) | 52.0 kg | 49.0 kg | +1.7 / +1.4 kg |
| Miller (1983) | 56.2 kg | 53.1 kg | +1.41 / +1.36 kg |
| Hamwi (1964) | 48.0 kg | 45.5 kg | +2.7 / +2.2 kg |
Different formulas give different answers, which is why a range beats a single number.
Factors Affecting Your Ideal Weight Result
Height is the main continuous variable in the Devine formula; each centimetre above the 152 cm reference point changes the estimated weight through the 0.9 multiplier used by the script. Sex changes the starting constant, with 50 kg used for men and 45.5 kg for women in the source formula.
Body-frame selection then scales that estimate by 0.90, 1.00, or 1.10, so the same height can produce different adjusted values. The source explicitly states that age is used only for guidance and recommendations, not in the weight formula, so changing age alone should not be interpreted as mathematically changing the Devine estimate.
The reference table also compares the single estimate with a broader healthy-BMI range, highlighting that body composition and individual differences are not captured by a simple height formula. Unit accuracy matters because the equation expects height in centimetres.
Treat the output as a standardized reference rather than evidence that a person must reach one exact number.
Benefits of Using the Ideal Weight Calculator
- Apply the exact Devine formula shown in the script without manually converting height differences and adding the sex-specific base value.
- See how the page’s small, medium, and large frame adjustments change the single formula estimate by the stated 10% factors.
- View a range around the adjusted estimate rather than treating one calculated kilogram value as the only acceptable result.
- Compare the Devine-based figure with the broader healthy-BMI ranges provided in the reference tables and recognize that the methods answer different questions.
- Keep age separate from the formula itself, matching the source note that age is collected for guidance rather than used in the Devine calculation.
Frequently asked questions
What formula does the Ideal Weight Calculator use for men?
The source uses Ideal Weight = 50 + 0.9 × (Height in cm − 152). The result is then adjusted by the selected body-frame factor.
What formula does it use for women?
The script uses Ideal Weight = 45.5 + 0.9 × (Height in cm − 152), followed by the same frame adjustment of 0.90, 1.00, or 1.10.
How does body frame change the estimate?
Small frame multiplies the Devine result by 0.90, medium frame leaves it unchanged, and large frame multiplies it by 1.10. The displayed range is then based on the adjusted value.
Does age change the calculated ideal weight?
Not in the formula stated in the source. The script notes that age is used only for guidance and recommendations, while height, sex, and selected frame size determine the weight estimate.
Why is the reference table’s healthy BMI range wider than the ideal-weight number?
They are different methods. The Devine formula produces a single reference estimate, while the BMI table spans a range of weights corresponding to standardized BMI boundaries. The source itself notes that a range can be more useful than one ideal figure.
Final Words
Think of the Ideal Weight Calculator as a way to apply the exact Devine formula shown in the script without manually converting height differences and adding the sex-specific base value, rather than as a source of one unquestionable answer.
The result still reflects the fact that sex changes the starting constant, with 50 kg used for men and 45.5 kg for women in the source formula. Before you finish, see how the page’s small, medium, and large frame adjustments change the single formula estimate by the stated 10% factors.
Use the Ideal Weight Calculator again whenever the situation changes enough to make the earlier result stale.
Disclaimer
This calculator provides estimates for general informational and educational purposes only and should not be treated as financial, medical, legal, or professional advice. Results depend entirely on the accuracy of the figures you enter.
Always verify important decisions with a qualified professional, official documentation, or your financial institution before acting on any result shown here.
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