Ideal Weight Calculator by Age
Ideal body weight using the Devine, Robinson, Miller and Hamwi formulas.
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About the Ideal Weight Calculator by Age
Ideal Weight Calculator by Age estimates your ideal body weight (IBW) using four widely-used clinical formulas — Devine, Robinson, Miller and Hamwi — and averages them so you end up with a single, defensible target.
How to use
- Choose gender.
- Enter age and height in centimetres.
- Click Calculate to see each formula's result and the average.
Benefits & key features
- Four trusted formulas let you triangulate instead of trusting one.
- Separate baselines for men and women.
- Returns a ±5% range — weight is a band, not a single number.
- Pairs with the TDEE calculator for daily calorie planning.
Pro tip
Clinical IBW formulas ignore frame size. Someone with a 'large frame' can be 5-10% above the formula average and still be perfectly healthy.
Why choose toolsfy for Health & Fitness tools?
A BMI calculator that harvests your email address, a TDEE estimator that upsells coaching — the health-and-fitness web is riddled with dark patterns. toolsfy's tools compute the same peer-reviewed equations (Mifflin-St Jeor for TDEE, WHO BMI bands, U.S. Navy body-fat formula) without asking for anything more than the numbers needed to run the math.
Common use cases
- Personal trainers running quick BMI and body-fat estimates for new clients during their first consultation, with nothing logged or stored.
- Home cooks planning a short calorie-deficit cycle and wanting the daily target in plain numbers rather than a vague "app score".
- Patients preparing for a doctor's appointment by converting a mg/dL blood-sugar reading into mmol/L (or vice versa) before their consult.
Frequently asked questions
Is this medical advice?
No. These tools are educational and use standard published equations. Always discuss real health decisions with a licensed clinician.
How accurate are estimates like TDEE or body fat?
They are good screening estimates for a general adult population. Individual metabolism can vary ±10–15%, so treat the number as a starting point, not a target.
Do you store my weight, height or health data?
Never. The values are only used inside this tab to compute the result. Close the tab and every trace is gone.