How to use the ideal weight calculator
Prepare the values for this calculation
Show several common adult ideal-body-weight reference formulas from height and sex used by the formula. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Sex used by reference formulas: choose Male, Female. Match this selection to the data you enter.
- Height (in): enter a value at least 48 and no more than 96. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Devine reference weight first. With the unchanged example inputs, it is 73 kg. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Height (in) from 70 to 77. The resulting Devine reference weight is 89.1 kg. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Ideal Weight Calculator formula
Devine, Robinson, Miller and Hamwi reference equations use a base weight at 5 ft plus an increment per inch above 5 ft.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Sex used by reference formulas | Select an option | Male |
| Height (in) | minimum 48; maximum 96 | 70 |
Worked example
Using the example inputs above, the devine reference weight is 73 kg.
- Devine reference weight
- 73 kg
- Robinson
- 71 kg
- Miller
- 70.3 kg
- Hamwi
- 75 kg
Results and assumptions
These are historical reference equations, not individualized healthy-weight targets.
Fix an input or unexpected result
Height (in) is required. Enter height (in) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.