Fetal Weight Estimator

Fetal Weight Estimator is evaluated from Gestational Age. The calculation reports Estimated Fetal Weight, Estimated Fetal Weight and Estimated Fetal Weight.

Results

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About the Fetal Weight Estimator

Fetal Weight Estimator is treated here as a quantitative relation between Gestational Age and Estimated Fetal Weight, Estimated Fetal Weight, Estimated Fetal Weight and 10th Percentile.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Estimated percentile ranges: ±25 - 30% of mean represents the 10th - 90th percentile range.

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Estimated percentile ranges: ±25 - 30% of mean represents the 10th - 90th percentile range.

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: 28 Weeks Gestation — Third Trimester Start

Inputs

gestational_weeks: 28
Estimated Fetal Weight: 9,683 grams. Estimated Fetal Weight: 341.5 oz. Estimated Fetal Weight: 21.35 lbs. 10th Percentile: 7,262 g. 90th Percentile: 12,588 g. Size Category: Appropriate for Gestational Age (AGA)

With Gestational Age = 28 as the stated inputs, the result is Estimated Fetal Weight = 9,683 grams, Estimated Fetal Weight = 341.5 oz and Estimated Fetal Weight = 21.35 lbs. Each value corresponds to the declared output fields.

Example 2: 36 Weeks — Late Preterm

Inputs

gestational_weeks: 36
Estimated Fetal Weight: 22,507 grams. Estimated Fetal Weight: 793.8 oz. Estimated Fetal Weight: 49.62 lbs. 10th Percentile: 16,880 g. 90th Percentile: 29,259 g. Size Category: Appropriate for Gestational Age (AGA)

With Gestational Age = 36 as the stated inputs, the result is Estimated Fetal Weight = 22,507 grams, Estimated Fetal Weight = 793.8 oz and Estimated Fetal Weight = 49.62 lbs. Each value corresponds to the declared output fields.

Example 3: 40 Weeks — Full Term

Inputs

gestational_weeks: 40
Estimated Fetal Weight: 28,953 grams. Estimated Fetal Weight: 1,021.2 oz. Estimated Fetal Weight: 63.83 lbs. 10th Percentile: 21,715 g. 90th Percentile: 37,639 g. Size Category: Appropriate for Gestational Age (AGA)

With Gestational Age = 40 as the stated inputs, the result is Estimated Fetal Weight = 28,953 grams, Estimated Fetal Weight = 1,021.2 oz and Estimated Fetal Weight = 63.83 lbs. Each value corresponds to the declared output fields.

Example 4: 20 Weeks — Anatomy Scan Week

Inputs

gestational_weeks: 20
Estimated Fetal Weight: 2,648 grams. Estimated Fetal Weight: 93.4 oz. Estimated Fetal Weight: 5.84 lbs. 10th Percentile: 1,986 g. 90th Percentile: 3,442 g. Size Category: Appropriate for Gestational Age (AGA)

With Gestational Age = 20 as the stated inputs, the result is Estimated Fetal Weight = 2,648 grams, Estimated Fetal Weight = 93.4 oz and Estimated Fetal Weight = 5.84 lbs. Each value corresponds to the declared output fields.

Common Use Cases

  • Estimate expected fetal weight by gestational week
  • Compare fetal weight against population percentiles
  • Understand fetal growth milestones by trimester
  • Educational reference for pregnancy weight gain planning