Breastfeeding Calorie Needs Calculator
Estimate the extra calories to add for milk production while breastfeeding, based on your maintenance needs, how much you nurse, and any weight-loss goal.
How it works
Calories = maintenance + milk energy cost − energy from fat stores · Milk cost ≈ 500 kcal/day exclusive, 330 partial · Weight-loss goal draws ≈ 170 kcal/day from stores · Floor 1,800 kcal
Making milk costs energy — roughly 500 kcal a day for exclusive feeding in the first six months. Adding most of that to your maintenance calories supports supply. If you want gradual postpartum weight loss, letting about 170 kcal a day come from fat stores creates a gentle deficit while still fuelling milk. Cutting too hard can reduce supply and energy, so intake should not fall below about 1,800 kcal while breastfeeding.
Worked example
With 2,000 kcal maintenance, exclusive feeding, and a maintain goal, add 500 kcal for about 2,500 kcal/day. Choosing gradual loss instead draws 170 kcal from stores, so you eat about 2,330 kcal while still losing slowly.
Frequently asked questions
Will eating less hurt my milk supply?
Modest deficits are usually fine once feeding is established, but sharp restriction can lower supply and leave you exhausted. Keep intake at or above about 1,800 kcal and lose weight gradually.
Does exclusive feeding really need 500 extra calories?
Roughly, yes — that is the energy content of the milk produced. Partial or combination feeding produces less milk, so the extra need is smaller, around 330 kcal.
How fast can I safely lose weight while nursing?
About 0.5 kg (1 lb) per week is a common gentle target once supply is stable. Faster loss is generally discouraged during lactation.
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Educational estimate only, not medical advice. Cycles, nutrient needs and risk vary between people — discuss decisions with a qualified clinician.