Breastfeeding Calorie Calculator

Most breastfeeding women need an additional 400–500 calories per day on top of their normal maintenance calories. The exact amount depends on your age, weight, height, and activity level. This calculator uses the Mifflin-St. Jeor Equation to personalize the estimate for you.

Exclusive breastfeeding burns roughly 400–500 calories per day, as your body uses energy to produce breast milk. Partial or combo feeding burns around 250 calories per day. These calories come from your diet and, to some extent, stored body fat.

Yes — pumping burns roughly the same number of calories as nursing directly, because the energy cost is in producing the milk, not the act of nursing itself. Whether you breastfeed or exclusively pump, your calorie needs remain similar.

Most lactation experts and dietitians advise against strict intermittent fasting while breastfeeding. Severely restricting your eating window can reduce milk supply and deprive you of essential nutrients. Focus on meeting your total daily calorie needs consistently throughout the day.

Weight gain during breastfeeding can happen if your calorie intake exceeds your total needs, which includes your activity level and the extra calories burned by milk production. Hormonal changes, water retention, and fatigue-driven eating can also play a role. Using this calculator helps you understand your true calorie target.

Start with your Basal Metabolic Rate (BMR) calculated using the Mifflin-St. Jeor Equation, multiply by your activity factor to get your maintenance calories, then add approximately 250–400 calories for breastfeeding. This calculator does all of that automatically based on your inputs.

After six months, when many babies start solid foods and nurse less frequently, your extra calorie needs may decrease slightly. However, if you are still exclusively or predominantly breastfeeding, continuing to add around 400 calories per day is generally recommended. Consult your dietitian for personalized guidance.

Eating too few calories — generally below 1,500–1,800 kcal/day — can reduce milk supply, lead to nutritional deficiencies, cause fatigue, and slow postpartum recovery. It is important to meet your full calorie needs to support both your health and your baby's growth.