How to use the teen bmi weight loss calculator
Prepare the values for this calculation
Calculate the body weight corresponding to a target BMI and compare it with current weight. 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
- Current weight (kg): enter a value at least 1 and no more than 500. Use the unit named in the label or selected above. Do not leave this required field blank.
- Height (cm): enter a value at least 30 and no more than 260. Use the unit named in the label or selected above. Do not leave this required field blank.
- Target BMI: enter a value at least 10 and no more than 60. 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 Weight at target BMI first. With the unchanged example inputs, it is 67.38 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 (cm) from 175 to 192.5. The resulting Weight at target BMI is 81.52 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.
Teen BMI Weight Loss Calculator formula
Target weight=target BMI×height(m)²; modeled change=target weight−current weight.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Current weight (kg) | minimum 1; maximum 500 | 85 |
| Height (cm) | minimum 30; maximum 260 | 175 |
| Target BMI | minimum 10; maximum 60 | 22 |
Worked example
Using the example inputs above, the weight at target bmi is 67.38 kg.
- Weight at target BMI
- 67.38 kg
- Modeled weight change
- -17.63 kg
- Target BMI
- 22
Results and assumptions
A BMI-derived target is a mathematical reference, not an individualized health recommendation.
Fix an input or unexpected result
Current weight (kg) is required. Enter current weight (kg) 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.