BMI at Delivery Calculator
Actual delivery-period versus prepregnancy BMI reconciliation. Pregnancy contents/fluids contribute to mass; not classify adiposity, diagnose risk or apply adult BMIcategories as pregnancy goals.
Description
Body mass index uses weight divided by squared height.
Body mass index uses weight divided by squared height.1
A delivery-weight BMI differs from a prepregnancy BMI used to establish some reference categories.
When to use BMI at Delivery Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
How to use BMI at Delivery Calculator and understand its results
- Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
- Enter independentlyRecordedDeliveryWeightKg, independentlyRecordedPrepregnancyWeightKg, independentlyMeasuredAdultHeightMeters, using the field meanings and rules below, then run the tool.
- Read result.observedDeliveryBmi, result.signedDeliveryMinusPrepregnancyBmi. Use the units and sign conventions below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyRecordedDeliveryWeightKg | Independently recorded delivery weight kg | number | Required |
| independentlyRecordedPrepregnancyWeightKg | Independently recorded prepregnancy weight kg | number | Required |
| independentlyMeasuredAdultHeightMeters | Independently measured adult height meters | number | Required |
Require positive delivery weight, prepregnancy weight and height in meters. Return delivery weight divided by squared height and the weight difference divided by squared height.
deliveryBMI=deliveryKg/heightMeters²; signedBMIChange=(deliveryKg−prepregnancyKg)/heightMeters² Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.observedDeliveryBmi | Observed Delivery Bmi | number |
| result.signedDeliveryMinusPrepregnancyBmi | Signed Delivery Minus Prepregnancy Bmi; preserve the subtraction order and sign defined in the mechanics | number |
{
"input": {
"independentlyRecordedDeliveryWeightKg": 70,
"independentlyRecordedPrepregnancyWeightKg": 60,
"independentlyMeasuredAdultHeightMeters": 1.5
},
"output": {
"result": {
"observedDeliveryBmi": 31.11111111111111,
"signedDeliveryMinusPrepregnancyBmi": 4.444444444444445
}
}
}Limitations and assumptions
Dating evidence, acquisition conditions and applicable clinical references remain independently established. The output describes supplied observations or a conditional model without diagnosing an outcome, choosing a dose or verifying clinical applicability.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Postpartum Weight Loss Rate Calculator: Postpartum weight-loss rate compares matched body-weight measurements over elapsed time. For a complementary comparison, use Maternal Weekly Weight Gain Calculator: Weekly maternal weight gain compares two matched weights over an explicitly supplied interval.
References
-
BMI at Delivery Calculator — tool.io
Similar or alternative tools
- Postpartum Weight Loss Rate Calculator
Postpartum weight-loss rate compares matched body-weight measurements over elapsed time.
- Maternal Weekly Weight Gain Calculator
Weekly maternal weight gain compares two matched weights over an explicitly supplied interval.