Health & Wellness Tools
Ideal Weight Calculator
Find your ideal body weight range using multiple proven formulas.
This tool provides an estimate or a starting draft. Check the assumptions and current official requirements before relying on the result. It does not replace qualified financial, legal or medical advice.
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The Ideal Weight Calculator uses four medically established formulas to estimate the ideal body weight (IBW) for your height and gender. While 'ideal weight' is a simplified concept, IBW formulas are widely used in clinical settings for medication dosing (tidal volume in ventilated patients, chemotherapy doses), nutritional assessments, and BMI interpretation.
The four formulas used: Hamwi (1964) — the original clinical standard used in pharmacy; Devine (1974) — most widely used in pharmacology and ICU settings; Robinson (1983) — a revised formula addressing Hamwi's tendency to underestimate for tall individuals; Miller (1983) — more conservative, often used in geriatrics. All formulas use height above 5 feet (152 cm) as the base.
Important context: IBW formulas were developed for clinical dosing calculations, not fitness or aesthetic goals. The WHO BMI healthy range (18.5–24.9) is a better public health indicator of healthy weight. Muscle-heavy individuals (athletes, bodybuilders) will be 'overweight' by both BMI and IBW despite excellent health. These tools are starting points for conversation, not definitive health standards.
How to use this utility
- Use the controls below—paste text, pick files, or adjust options as described on the tool.
- Click the main action button. Processing runs in your browser on this device.
- Download or copy the output. Check the processing note for any external services used by this operation.
Common use cases
- Understanding what 'healthy weight' means for your height according to multiple medical frameworks
- Using IBW as one reference point when setting a weight loss or gain goal
- Medical reference: healthcare providers use IBW for drug dosing calculations
- Comparing your current BMI-based healthy range with formula-based estimates
- Understanding that healthy weight varies with body composition, not just height
Tips for best results
- 1Focus on the BMI range (18.5–24.9 for your height) rather than a single ideal number
- 2Muscle weighs 3x more than fat — an athletic person at 'ideal BMI' weighs more than a formula prediction
- 3Use body composition measurements (body fat % via DEXA scan) for more accurate health assessment
- 4IBW formulas were designed for clinical use, not fitness goals — they may seem 'too low' for muscular individuals
- 5Track waist-to-height ratio (waist ÷ height < 0.5) as a better metabolic health indicator than weight alone
Frequently asked questions
- Is Konnect2Tools free?
- Yes. These in-browser tools are completely free to use with no account required for core functionality.
- Do my files leave my device?
- Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.
- Is the Ideal Weight Calculator tool safe to use?
- Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.
- Are ideal weight formulas accurate for Indians?
- Standard IBW formulas were derived from Western populations. For Indians, research suggests a lower BMI threshold for metabolic risk — Indians have higher body fat percentage at the same BMI compared to Europeans, and metabolic risk (diabetes, hypertension) increases at lower BMI values. Indian Council of Medical Research recommends BMI 18.5–22.9 as healthy for Indians, versus 18.5–24.9 in Western guidelines.
- Why do the four formulas give different results?
- Each formula was developed with different patient populations and purposes. Hamwi was developed for army medical use; Devine was developed for pharmacokinetic dosing; Robinson and Miller revised earlier formulas with new data. They all produce similar results for average height adults but diverge for very short (<155cm) or very tall (>185cm) individuals.
- What if I'm significantly above or below my ideal weight?
- IBW is a reference point, not a strict target. Focus on healthy behaviors: regular physical activity, balanced diet, adequate sleep, and stress management — these improve health outcomes regardless of weight. If you're significantly above healthy BMI (>30), consult a registered dietitian and doctor for a medically supervised plan. Rapid weight loss is counterproductive long-term.
- Is ideal weight different for men and women?
- Yes — men have higher average muscle mass (which is denser than fat), so IBW is higher for men at the same height. All four formulas have gender-specific versions. Example for 170cm: Devine formula gives 70.2kg for men vs 65.5kg for women. In practice, BMI range (18.5–24.9) accounts for gender naturally since women tend toward lower BMI values within the healthy range.
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