Calculate your estimated ideal body weight
Use this ideal body weight (IBW) calculator for women to estimate a target weight based on height and well-known clinical formulas.
What is an ideal body weight for women?
Ideal body weight for women is a practical estimate of a healthy target weight based mainly on height. Most calculators use medical formulas created for clinical dosing and screening. These formulas are simple, fast, and useful for setting a baseline.
That said, your healthiest weight is not just one number. Muscle mass, body composition, age, genetics, activity level, and medical history all matter. So think of IBW as a useful starting point rather than a strict goal you must hit exactly.
How this ideal body weight for women calculator works
This calculator converts your height to inches, then applies one or more evidence-based IBW formulas. You can use a single formula or the average of all four:
- Devine formula: 45.5 kg + 2.3 kg per inch over 5 feet
- Robinson formula: 49 kg + 1.7 kg per inch over 5 feet
- Miller formula: 53.1 kg + 1.36 kg per inch over 5 feet
- Hamwi formula: 45.5 kg + 2.2 kg per inch over 5 feet
You can also apply a small frame or large frame adjustment to get a more personalized estimate. The calculator then shows your target in kilograms and pounds, plus a practical 10% range.
How to use the calculator correctly
1) Enter accurate height
Measure without shoes. Even a one-inch difference changes your IBW estimate.
2) Pick a formula strategy
If you are unsure which formula to trust, choose Average of all formulas. It smooths out differences and gives a balanced estimate.
3) Add frame size if needed
Smaller frames may naturally sit lower, and larger frames may sit higher. Frame adjustment is optional and should be interpreted with common sense.
4) Use the range, not only one exact number
A healthy weight target is usually a zone. The 10% range helps avoid all-or-nothing thinking and supports sustainable progress.
IBW vs BMI vs body fat percentage
People often compare IBW with BMI and body fat percentage. They each answer different questions:
- IBW: Height-based target estimate (simple and quick).
- BMI: Weight-for-height screening index (population-level tool).
- Body fat %: Better insight into composition (fat vs lean mass).
If you can, combine all three with waist circumference and lab markers (such as blood sugar and lipids) for a better health picture.
What affects a healthy weight beyond formulas
Two women with the same height can have very different healthy weights. Important factors include:
- Lean muscle mass and strength training history
- Bone structure and frame size
- Hormonal status and age
- Pregnancy/postpartum history
- Medication use and chronic conditions
- Sleep quality, stress load, and daily activity
Setting realistic goals with your IBW estimate
Focus on behavior targets first
Use habits that move your health in the right direction: regular walking, progressive strength training, protein at meals, fiber-rich foods, and consistent sleep.
Aim for gradual change
If fat loss is your goal, modest weekly progress usually beats extreme diets. Sustainable plans protect mood, metabolism, and long-term adherence.
Track non-scale wins
Watch improvements in energy, confidence, exercise performance, blood pressure, and blood test trends. These often matter more than one scale number.
Frequently asked questions
Is ideal body weight the same as my best weight?
Not always. Your best weight is the one where your health markers, lifestyle, and quality of life are all in a good place.
Can this calculator be used during pregnancy?
Not as a standalone guide. Pregnancy weight targets should be personalized by your obstetric provider.
Why do different formulas give different answers?
Each formula was developed from different patient populations and assumptions. That is why the average option can be useful for general planning.
Should I worry if my current weight is above the estimate?
No panic needed. Use the result as information, not judgment. Small, consistent health changes are far more effective than crash approaches.
Bottom line
This ideal body weight for women calculator gives a practical starting point grounded in standard clinical equations. Use it to guide goals, conversations with your healthcare professional, and long-term healthy habits. Think in ranges, stay consistent, and optimize health—not just the number on the scale.