Evidence-informed energy estimate

Breastfeeding Calorie Calculator

Estimate daily energy needs during the first 12 months of breastfeeding using adult Dietary Reference Intake energy equations plus the lactation calorie adjustments used in U.S. dietary guidance.

DRI-based baseline0–12 months postpartumNo weight-loss deficit
Calculation modelBaseline energy + lactation adjustment

The estimate starts with age, body size, and activity level. It then adds the breastfeeding energy adjustment for your postpartum stage.

0–6 months+330 kcal/day
7–12 months+400 kcal/day
01 · Your details

Build your breastfeeding energy estimate

02 · Activity level

Choose the description that best matches your usual week

03 · Breastfeeding stage

Tell us where you are in the first postpartum year

Approximate share of feeds that are breast milk

For mixed feeding, the calculator proportionally scales the lactation adjustment. That scaling is a practical estimate, not a separate official calorie recommendation.

Method & sources

What this calculator is based on

The baseline calculation uses the adult female Estimated Energy Requirement equation from the Dietary Reference Intakes. The lactation adjustment uses the commonly cited U.S. guidance of about 330 additional calories per day in the first 6 months and 400 additional calories per day in months 7–12 for well-nourished breastfeeding women.

CDC: Maternal Diet and BreastfeedingNCBI: DRI energy equations and activity coefficients

This tool is for general education only and does not diagnose, treat, or replace individualized medical or nutrition advice.