Ideal Weight Calculator
Calculate your ideal body weight range based on multiple scientifically proven formulas
This Ideal Weight Calculator provides an estimate of a healthy body weight based on your height and gender. It uses four different medically accepted formulas to give you a comprehensive range rather than a single number.
Calculator Inputs
Enter height in cm (metric) or inches (imperial)
Age is not used in most IBW formulas but provides context
Results
Enter values above to see your results
How It Works
We use the Devine, Robinson, Miller, and Hamwi formulas. These were originally developed for calculating drug dosages but are widely used to estimate healthy body weight. We also calculate the "Healthy BMI Range" (BMI 18.5 - 25).
Tips & Best Practices
- •These formulas do not account for muscle mass or body frame size.
- •Athletes may weigh more than the "ideal" due to muscle, which is healthy.
- •Treat the result as a general range, not a strict target.
- •The BMI range (18.5-24.9) is the broadest and most commonly used medical standard.
Frequently Asked Questions
Which formula is the most accurate?
The Devine formula is the most widely used medically. However, no single formula is perfect for everyone, which is why we show you results from multiple methods.
Why is the range so wide?
Healthy bodies come in many shapes and sizes. The BMI range accounts for different frame sizes and muscle compositions, providing a safe weight zone rather than a single "perfect" number.
Guides & Articles
Due Date From Ovulation or Conception Date
Add 266 days to an ovulation date or a conception date. A worked example, why both dates use the same rule, and when the period method is the better start.
How Accurate Are Pregnancy Due Dates?
A due date is the 40-week mark from a period, or 38 weeks from ovulation. Most births are not on that exact day. What moves the estimate, and what replaces it.
How Many Days Is a Pregnancy?
280 days (40 weeks) from the last menstrual period, or 266 days (38 weeks) from conception. Same model, different starting point, plus the term labels clinicians use.
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