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Ideal Weight Calculator

Find your ideal body weight using 5 commonly referenced formulas (Robinson, Miller, Devine, Hamwi, BMI‑based). See an ideal range, how far you are from it, and a clean visual comparison vs your current weight.

✅ 5 formulas in one view ✅ Ideal range + difference from current ✅ Visual chart for quick clarity
Last updated: March 2026

📝 Enter Your Details

Height and sex are used by the classic formulas. Add your current weight to see how far you are from the ideal range.

Most ideal‑weight formulas use sex‑specific constants.
Note: Classic ideal‑weight formulas are most commonly used for adults.
Please enter a valid age (2–100).
Optional adjustment: small frame trends a bit lower, large frame a bit higher.
Please enter a valid height (80–250 cm).
Recommended for the “how far from ideal” result.
Please enter a valid weight (20–400 kg).

Results & Insights

Your ideal weight updates live as you type.

👈 Enter your height to see your ideal weight

Required: height. Recommended: current weight for “difference” + chart.
📌 Professional note

Ideal weight is best used as a range

People search “what should I weigh?” because they want a simple answer. A better approach is a reasonable range plus a plan you can sustain. This calculator shows 5 common methods at once so users can compare and avoid extreme conclusions.

What Is an Ideal Weight Calculator?

An ideal weight calculator estimates a target body weight based on height (and sometimes sex and frame size). Many calculators use historical “Ideal Body Weight (IBW)” formulas like Devine, Robinson, Miller, and Hamwi, plus a BMI-based estimate.

How to Use This Ideal Weight Calculator

  1. Choose Metric or Imperial (kg/cm or lbs/ft/in).
  2. Select biological sex (used by classic IBW formulas).
  3. Select frame size if you want a small/medium/large adjustment.
  4. Enter height (required).
  5. Enter current weight (recommended) to see how far you are from the ideal range and view the chart.

Which Formulas Are Used?

Classic IBW formulas (point estimates)

  • Devine
  • Robinson
  • Miller
  • Hamwi

These typically use a “base weight” at 5'0" and add weight per inch above 5'0".

BMI-based method (a modern cross-check)

This tool includes a BMI-based estimate (using a mid-range BMI reference) and also shows the healthy BMI weight range (BMI 18.5–24.9) for your height.

How to Interpret Your Result (Without Overthinking)

  • Use the combined range (min→max across formulas) as a flexible target band.
  • If your current weight is outside the band, focus on habits (steps, strength, protein, sleep) before chasing a single number.
  • If you’re inside the band, that’s often a good sign—aim for strength, energy, and consistency.

Quick Reference: Healthy BMI Weight Range

Many health systems use BMI categories for adults. A common “healthy weight” BMI range is 18.5–24.9. This calculator shows the weight range that corresponds to that BMI interval for your height.

BMIMeaning (simple)
< 18.5Below typical adult healthy range
18.5–24.9Typical adult healthy range
25.0–29.9Above typical adult healthy range
≥ 30.0Higher-risk screening category

Important: BMI is a screening tool and does not measure body composition.

Frequently Asked Questions (Ideal Weight)

It’s an estimated target body weight for a given height, often calculated using classic IBW formulas or BMI-based methods. It’s a guideline, not a diagnosis.
No single formula is perfect. Many people use a range across multiple formulas (like this tool does) to get a realistic band instead of one rigid number.
They were developed in different contexts and use slightly different constants and increments per inch/cm. Differences are expected and usually small.
Frame size isn’t directly measured here, so the adjustment is optional. It can help some users interpret a range more comfortably (small frame slightly lower, large frame slightly higher).
Not always. Healthy weight is often shown as a BMI-based range. Ideal-weight formulas give point estimates that may sit inside that BMI range, but they are not identical concepts.
Use with caution. If you have higher muscle mass, formulas may underestimate your “best” weight. Consider performance, waist measures, and body composition instead of chasing a formula number.
For ages 2–19, weight is usually assessed with growth charts and BMI-for-age percentiles. Adult ideal-weight formulas are not the standard approach for children and teens.
Focus on sustainable habits (sleep, steps, strength training, protein + fiber) and consider medical guidance if you have health concerns. Small consistent changes beat extreme plans.