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Homeโ€บ Health Calculatorsโ€บ Body & Fitnessโ€บ Ideal Weight Calculator

Ideal Weight Calculator
with Healthy Weight Range by Height

Estimate ideal body weight using several common formulas and compare them with the healthy BMI range for your height. See current weight difference using metric or imperial units.

๐ŸŽฏ
Ideal Weight Calculator
โšฅ
Some classic ideal-weight formulas differ by sex.
๐Ÿง
Applies a light adjustment to the blended reference result.
Metric inputs
cm
Required for both formula-based and BMI-based ranges.
kg
Optional. Used to show the difference from the reference result.
Imperial inputs
ft
Feet part of height.
in
Inches part of height.
lb
Optional. Used to show the difference from the reference result.
Reference note
This calculator shows several classic ideal-weight formulas plus the healthy BMI range. The blended reference result averages the formula outputs and then applies a light frame-size adjustment.
Blended Reference Weight
โ€”
average of classic formula outputs with frame-size adjustment
Healthy BMI Range
โ€”
BMI 18.5 to 24.9 for your height
Healthy Midpoint
โ€”
middle of the healthy BMI range
Current Weight Difference
โ€”
difference from the blended reference result
Relative Interpretation
โ€”
context of current position vs reference and range
Hamwi
โ€”
Classic height-based estimate.
Devine
โ€”
Widely referenced medical dosing formula.
Robinson
โ€”
Alternative classic height formula.
Miller
โ€”
Another commonly cited estimate.
Healthy BMI range detail
Lower healthy weightโ€”
Upper healthy weightโ€”
Range widthโ€”
Range midpointโ€”
Context
Sexโ€”
Frame sizeโ€”
Height usedโ€”
Interpretationโ€”
Ideal Weight Interpretation
Unit systemโ€”
Sexโ€”
Frame sizeโ€”
Height usedโ€”
Hamwi estimateโ€”
Devine estimateโ€”
Robinson estimateโ€”
Miller estimateโ€”
Formula averageโ€”
Frame adjustmentโ€”
Blended reference weightโ€”
Healthy BMI rangeโ€”
Current weightโ€”
Current differenceโ€”
Relative interpretationโ€”
This calculator provides general estimates and is not medical advice. โ€œIdeal weightโ€ is not a single medically fixed number and can vary by body composition, muscle mass, frame, and health context.
โœฆ Cal, AI Explanation
Cal is reviewing your ideal weight result...
๐Ÿ’ฌ Ask Cal about your ideal weight result
Cal
Your ideal weight estimate is ready. Ask me how the formulas differ, how the healthy BMI range relates to the reference value, or how current weight is compared.

๐Ÿ’ก Ideal Weight Notes

Classic ideal-weight formulas are height-based estimates, not exact health targets.
The healthy BMI range gives a range of weights for the same height, not one single number.
Different formulas can produce slightly different results even with the same height.
This tool blends several common formulas and shows the BMI healthy range alongside them.
Body composition can matter more than any single โ€œidealโ€ number.
Related Calculators
BMI Calculatorโ†’ Body Fat Calculatorโ†’ Lean Body Mass Calculatorโ†’ Calorie Deficit Calculatorโ†’ Waist to Height Ratioโ†’
Related Guides
What Is Ideal Body Weightโ†’ Ideal Weight vs BMI Rangeโ†’ How Height-Based Weight Formulas Workโ†’

How ideal weight is estimated

โ€œIdeal weightโ€ is usually estimated from height-based formulas rather than measured directly. Several classic formulas, such as Hamwi, Devine, Robinson, and Miller, start from a base value and then adjust upward with height. Because these formulas differ, they often produce slightly different results for the same person.

This calculator shows the individual formula outputs, their average, and a lightly frame-adjusted blended reference value. It also shows the healthy BMI range for the same height so the reference number can be viewed in context rather than in isolation.

Core structure

Formula Estimate = base weight + height adjustment above 5 ft
Formula Average = mean of Hamwi, Devine, Robinson, and Miller
Blended Reference = Formula Average + frame adjustment
Healthy BMI Range = BMI 18.5 to 24.9 converted to weight at your height
This calculator combines several classic approaches to show a reference estimate, not a fixed medical target.

Why formulas and BMI range differ

Classic ideal-weight formulas aim to produce a single reference estimate. By contrast, the BMI healthy range produces a lower and upper boundary for a given height. That means the formula outputs and the BMI range are related, but they are not built to answer exactly the same question.

For that reason, it is often more useful to look at the formula average together with the healthy BMI range rather than relying on one formula alone. The blended result gives a center-style reference, while the BMI range shows the broader span around it.

Classic formulas shown here

Formula Male Base Female Base Height Increment
Hamwi48.0 kg at 5 ft45.5 kg at 5 ft2.7 kg per inch
Devine50.0 kg at 5 ft45.5 kg at 5 ft2.3 kg per inch
Robinson52.0 kg at 5 ft49.0 kg at 5 ft1.9 / 1.7 kg per inch
Miller56.2 kg at 5 ft53.1 kg at 5 ft1.41 / 1.36 kg per inch

Current weight difference and reference context

If current weight is entered, the calculator shows the difference from the blended reference result. This does not mean that the reference number is the only acceptable outcome. It simply provides a structured comparison point against the formula average and the BMI healthy range.

For many people, the BMI range may be more useful as a broader context, while the blended reference serves as a single anchor point for interpretation.

Frequently Asked Questions

What is an ideal weight calculator?+
An ideal weight calculator estimates a reference body weight using height-based formulas and often compares that estimate with a healthy BMI weight range for the same height. Use the result as a screening-style estimate, not as a diagnosis. Body measurements and formula results can be affected by muscle mass, bone structure, fat distribution, age, pregnancy, hydration, and measurement technique. The output is useful for context, but it should not replace medical assessment.
Why are there several formula results?+
Because classic ideal-weight formulas are not identical. Each one uses a slightly different starting point and height increment, so the outputs vary somewhat. Use the result as a screening-style estimate, not as a diagnosis. Body measurements and formula results can be affected by muscle mass, bone structure, fat distribution, age, pregnancy, hydration, and measurement technique. The output is useful for context, but it should not replace medical assessment.
Is the blended reference weight a medical target?+
No. It is a blended estimate created from several formula outputs. It is best treated as a reference value rather than a fixed medical requirement. Use the result as a screening-style estimate, not as a diagnosis. Body measurements and formula results can be affected by muscle mass, bone structure, fat distribution, age, pregnancy, hydration, and measurement technique. The output is useful for context, but it should not replace medical assessment.
How is the healthy BMI range used here?+
The calculator converts BMI 18.5 to 24.9 into a lower and upper weight boundary for your height. This shows a broader healthy-range context alongside the formula estimates. Use the result as a screening-style estimate, not as a diagnosis. Body measurements and formula results can be affected by muscle mass, bone structure, fat distribution, age, pregnancy, hydration, and measurement technique. The output is useful for context, but it should not replace medical assessment.
Does this account for muscle mass or body composition?+
No. These formulas and the BMI range are mainly based on height and weight, not a full body composition assessment. That is why they should be used as general reference tools only. Use the result as a screening-style estimate, not as a diagnosis. Body measurements and formula results can be affected by muscle mass, bone structure, fat distribution, age, pregnancy, hydration, and measurement technique. The output is useful for context, but it should not replace medical assessment.