How many extra calories does breastfeeding require?

Breastfeeding commonly increases energy needs by about 300–500 kcal/day. Exclusive breastfeeding may require around 500 kcal/day, while partial breastfeeding may require about 300 kcal/day.

Is it safe to diet while breastfeeding?

Moderate calorie reduction (about 300–500 kcal/day) can be safe, but rapid or aggressive dieting is not recommended. Always consult a healthcare provider before starting a diet while breastfeeding.

Breastfeeding Calorie Deficit Calculator

Estimate daily calorie needs while breastfeeding, safe deficit, and projected weight change. Designed for postpartum individuals who are breastfeeding. For educational purposes only.

⚠️ Important Warning: Breastfeeding increases nutritional needs. This calculator provides estimates only. Consult a healthcare provider or lactation consultant before changing your diet or starting a weight-loss plan while breastfeeding.

Age (years)

Height (cm)

Current weight (kg)

Activity level

Breastfeeding type

Desired weekly weight change

BMR (estimated): —

Maintenance calories (TDEE): —

Breastfeeding additional kcal: —

Recommended daily intake for goal: —

Estimated weekly weight change: —

Breastfeeding Calorie Deficit Calculator — Complete Guide

This tool estimates basal metabolic rate (BMR), total daily energy expenditure (TDEE), adds breastfeeding needs, and then calculates a recommended daily calorie intake for your selected weight-change goal. It includes step-by-step explanations and practical tips for safely managing weight while breastfeeding.

How the calculator estimates calories (formulas)

We use the Mifflin–St Jeor equation to estimate BMR:

BMR (women) = 10 × weight_kg + 6.25 × height_cm − 5 × age − 161

TDEE = BMR × activity_factor. Then add breastfeeding additional kcal (300–500 kcal/day) depending on exclusivity.

Example scenario

30 years, 165 cm, 70 kg, moderately active, exclusive breastfeeding (~500 kcal/day), goal: lose 0.5 kg/week. The calculator will show estimated BMR, TDEE, breastfeeding kcal, recommended daily calories and projected weekly weight change.

Safety and clinical considerations

Rapid weight loss can reduce milk supply. Aim for modest deficits and check infant growth and milk supply. Work with a lactation consultant or registered dietitian if needed.

Practical tips

Prioritize nutrient-dense foods and adequate protein.
Stay hydrated — fluid needs increase during breastfeeding.
Monitor infant weight gain and milk supply when changing diet.

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