Ideal Weight Calculator
Find your ideal body weight range based on your height and sex using four evidence-based clinical formulas. See how your current weight compares, what a realistic target looks like, and what to do next to get there.
Enter your details
Ideal weight is estimated from height and sex using clinical formulas developed for medical dosing and screening. All four formulas are shown so you can see the range rather than a single arbitrary number.
4 formulas, not 1
No single formula is universally "correct." Showing all four gives you a range — your realistic ideal weight likely sits somewhere in the middle.
Why current weight matters
Entering your current weight shows how much you are above or below each formula's estimate — turning an abstract number into a concrete gap to close.
What is ideal weight?
Ideal body weight (IBW) is an estimate of the weight considered optimal for a given height and sex. The concept was originally developed in the 1960s–70s for clinical medicine — specifically for calculating drug dosages that are weight-dependent, where using actual body weight in obese patients would lead to overdosing.
Over time, IBW formulas became used more broadly as screening references for healthy weight ranges. They are not a precise target — a weight 5–10% above the formula result is still clinically reasonable for most adults. Think of it as a range, not a number.
The four formulas explained
This calculator uses all four major clinical IBW formulas. Each uses the same inputs but different coefficients:
Example calculation — 5'9" male
Height: 5'9" = 69 inches. Excess inches above 60 = 9.
A 5'9" male currently at 185 lb is approximately 26–33 lb above these estimates. That does not mean 185 lb is unhealthy — it depends heavily on muscle mass. But it gives a concrete reference point for goal-setting.
Limitations of ideal weight formulas
- No muscle vs fat distinction: A 185 lb bodybuilder and a 185 lb sedentary person get the same "above ideal" reading, but their health situations are completely different.
- No age adjustment: IBW formulas don't change with age. An 70-year-old and a 25-year-old of the same height get the same estimate, despite different healthy weight ranges.
- No frame size: A person with a large skeletal frame will naturally weigh more than a small-framed person of the same height. Frame size matters.
- Originally designed for dosing, not goals: These formulas were created so doctors could calculate medication doses — not as fitness targets. Using them as weight goals without clinical context can be misleading.
- Not validated for all ethnicities: Body composition norms vary by ethnicity. The formulas were developed on specific populations and may not translate equally across all groups.
Frequently asked questions
Which ideal weight formula is the most accurate?
No single formula is definitively most accurate for all individuals. The Devine formula is the most widely used in clinical settings. The Miller formula tends to produce lower estimates. Using the range across all four gives a more realistic picture than relying on any one formula alone.
What if my current weight is above the ideal range?
Being above the ideal weight range does not automatically mean you are unhealthy. Athletic individuals with high muscle mass frequently exceed IBW estimates. BMI, body fat percentage, blood pressure, and blood work together give a more complete picture than weight alone.
Is ideal weight the same as a healthy BMI weight?
Not exactly. A healthy BMI (18.5–24.9) typically implies a weight range, while IBW formulas give a single point estimate. The IBW range tends to fall within the lower portion of the healthy BMI weight band — roughly BMI 20–23.
How is ideal weight different from goal weight?
Ideal weight is a formula-based clinical estimate. Goal weight is a personal target you set based on how you want to feel, look, and perform. Your goal weight may be above, below, or at the ideal weight estimate — and that is completely valid.
Should I try to reach my ideal weight?
The ideal weight range is a useful reference point, not a mandate. Many people are healthy at weights above the estimate. Rather than targeting a specific number, focus on sustainable habits — consistent activity, balanced nutrition, and adequate sleep — and let the weight follow.
Related health calculators
These tools build naturally on your ideal weight result.
Disclaimer
This ideal weight calculator provides estimates based on clinical formulas originally developed for drug dosing. Results do not account for age, muscle mass, bone density, ethnicity, or individual health conditions. Use as a general reference only. Consult a qualified healthcare professional before setting weight loss or gain targets.