Ideal Weight Calculator - Based on Height & Age

Compare classic ideal weight formulas.

Devine (kg)

70.5

Robinson (kg)

68.9

Miller (kg)

68.7

Hamwi (kg)

72

Average ideal weight

70 kg

Ideal vs Current Weight

Formula Comparison

Formula Comparison

FormulaIdeal Weight (kg)Difference (kg)
Devine70.5 kg-0.5 kg
Robinson68.9 kg+1.1 kg
Miller68.7 kg+1.3 kg
Hamwi72 kg-2 kg

Understanding Ideal Weight

The ideal weight calculator shows you your target healthy weight according to four well-established medical formulas: Devine, Robinson, Miller, and Hamwi. Each formula was developed by physicians and researchers using different population data and methodologies, which means they can produce somewhat different results. This calculator presents all four estimates side by side so you can see the range and find a realistic target that makes sense for your body type and health profile. The Devine formula is the most widely used in clinical settings and was originally developed for medicinal dosage calculations. The Robinson formula tends to produce slightly lower ideal weights, while the Miller formula often gives higher values that some people find more realistic. The Hamwi formula was developed specifically for nutritional assessment and accounts for different body frame sizes. It is important to remember that ideal weight formulas are general guidelines, not absolute standards. They do not account for individual factors like muscle mass, bone density, body frame size, age, or overall health status. A muscular athlete may weigh significantly more than the calculated ideal weight while being perfectly healthy. Use these estimates as reference points in conversation with your healthcare provider rather than rigid targets. This free calculator gives you multiple perspectives to help you set realistic, healthy weight goals.

Practical Example

Real scenario: Alex, 32, earns a steady income and is making a real financial decision this month. They need to figure out their Ideal Weight for a specific situation — comparing options, planning a purchase, or stress-testing a strategy they're considering. They plug in the values below to see the actual number, not just a rough mental estimate.

Step 1 — The core financial input: The first value Alex enters is the headline number that drives everything else: the principal, the rate, the income, the cost. Let's say they enter $45,000 as the principal amount and a 6.5% annual interest rate over 30 years. This is a realistic figure for someone in Alex's position — not best case, not worst case, just the kind of number that actually shows up in real life for people with similar circumstances.

Step 2 — The supporting financial details: With the main number locked in, Alex adds the variables that fine-tune the answer: the time horizon, the rate of return, the inflation adjustment, the tax bracket. These don't define the result, but they shift it by 5-30% in either direction. Alex enters a monthly payment of $2,212, an extra $200/month toward principal, and a target payoff date 8 years sooner than scheduled.

Step 3 — Reading the result: The calculator returns: [result]. Before trusting it, Alex sanity-checks in two ways. First: does this number fall in the range they'd expect based on what they know about their own situation? Second: if they nudge the headline input by 10% in either direction, does the result move in a way that makes intuitive sense? Both questions answer yes, so the number is good to act on.

What Alex does next: Alex bookmarks the result and re-runs the calculation next month, or whenever one of the inputs changes materially. The point isn't to memorize one number — it's to build intuition for how each variable connects to the outcome, so future decisions can be made faster without having the calculator open every time.

Try it yourself: The numbers above are just an example. Plug in your own values, and the result will update instantly. Run it a few times with different inputs to see which variable has the biggest impact on the result — that's the one to focus your attention on for your specific situation.

Frequently Asked Questions

How is ideal weight calculated?

Common formulas (Hamwi, Devine, Robinson) use height and gender to estimate a healthy weight range, typically within ±10%.

Is ideal weight the same as healthy weight?

Not always — these formulas don't account for muscle mass or body type, so use them as a guideline alongside BMI and body fat.

Should I follow this strictly?

No — it's an estimate, not medical advice; talk to a doctor or dietitian about a healthy weight for your individual body.

How accurate are these calculations?

These calculations use scientifically validated formulas and provide good estimates for most people. However, individual factors like genetics, medical conditions, and medications can cause variations. Use results as guidelines, not definitive medical diagnoses.

When should I consult a healthcare professional?

Consult a doctor if your results are consistently outside normal ranges, if you experience related symptoms, or before making significant changes to your diet or exercise routine based on calculator results.

Disclaimer: This calculator provides estimates for informational purposes only. Actual results may vary. Consult a qualified professional for personalized advice.

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