Breastfeeding Calorie Calculator
Breastfeeding burns about 450–500 calories a day. Enter your details to see how many calories, how much protein, and how much fluid you need to keep your milk supply and your own recovery on track.
Reviewed by Shelley Darlington, Strong Curves founder and women's strength coach
Breastfeeding Calorie Calculator
Find your daily calorie, protein, and hydration needs while breastfeeding — calculated for women.
Enter your details to see your breastfeeding calorie and protein needs
How Many Calories Does Breastfeeding Burn?
Exclusive breastfeeding burns roughly 450–500 calories a day once your supply is established. Combination feeding (breast and formula) burns closer to 300 calories a day. Over a day that is about the same as a brisk 90-minute walk, and over six months of exclusive feeding it adds up to around 80,000 calories.
Your body does not expect you to eat all of it back. Part of the cost is covered by fat stored during pregnancy, which is why guidelines suggest eating about 330–400 extra calories a day rather than the full 500. That built-in gap is also why gradual weight loss while nursing is normal and safe.
How Many Calories Should You Eat While Breastfeeding?
For most exclusively breastfeeding women the answer lands between 2,300 and 2,800 calories a day, but the right number depends on your height, weight and how much you move.
This calculator starts from your own maintenance calories — estimated from your age, height, weight, and activity using the Mifflin-St Jeor equation for women — and adds the breastfeeding cost on top, so the number is personal to you rather than a generic average.
Breastfeeding Calorie Needs at a Glance
| Feeding pattern | Extra calories/day | Extra protein/day |
|---|---|---|
| Exclusive breastfeeding | +450–500 | ~25g |
| Partial / combination | +300 | ~15–20g |
| Weaning / occasional | Taper toward maintenance | Normal needs |
Protein and Hydration While Nursing
- Protein: aim for roughly 1.3g per kg of body weight while breastfeeding — protein supports milk production and your own tissue recovery.
- Fluids: target around 3.8 litres of total fluids per day (from drinks and food). A practical cue is to drink a glass of water each time you feed.
- Key nutrients: calcium (1000mg), iodine, choline, omega-3 DHA, and vitamin D matter for both you and your baby — continuing a prenatal or postnatal supplement is common.
Can You Lose Weight While Breastfeeding?
Yes — gently. Breastfeeding itself uses energy, and a modest calorie deficit is generally considered safe once your supply is well established (usually after the first 6–8 weeks). The important rule is pace: aim to lose no more than about 0.5 kg (1 lb) per week. Faster loss, very low-calorie dieting, or dropping below roughly 1,800 calories per day can reduce milk supply. Prioritise nutrient-dense whole foods over restriction.
Signs You're Eating Enough
- A steady, adequate milk supply
- Your baby gaining weight appropriately
- Stable energy and mood through the day
- Gradual (not rapid) return toward your pre-pregnancy weight
A note on individual needs
These are evidence-based averages. Twins, cluster feeding, thyroid conditions, and activity level can all shift your real needs. Use this as a starting point and adjust with your energy, supply, and your baby's growth — and check with your doctor or a lactation consultant if you're unsure.
Frequently Asked Questions
How many calories does breastfeeding burn a day?
Exclusive breastfeeding burns roughly 450–500 calories a day once your supply is established, and about 300 a day if you combine breast and formula. Your body covers part of that from fat stored during pregnancy, which is why the usual advice is to eat about 330–400 extra calories rather than the full amount.
How many calories should I eat while breastfeeding?
Most exclusively breastfeeding women need 2,300–2,800 calories a day, depending on height, weight and activity. The calculator above works this out for you: it estimates your maintenance calories with the female Mifflin-St Jeor equation, then adds the breastfeeding cost. Very few nursing mothers should be below 1,800 calories a day.
Can I be in a calorie deficit while breastfeeding?
Yes, a gentle one, once your supply is settled (usually after 6–8 weeks). A deficit of up to about 500 calories below your breastfeeding total, while staying above roughly 1,800 calories a day, supports losing about 0.5 kg (1 lb) a week without affecting milk supply. The calculator shows this as your supply-safe fat-loss target.
Why am I gaining weight while breastfeeding if it burns calories?
Breastfeeding increases appetite, and it is easy to eat more than the 450–500 calories it burns, especially with broken sleep, which also raises hunger hormones. Extra fluid retention and less movement in the early months add to it. Tracking intake for a week against your calculated needs usually shows where the gap is.
Do I need more calories if I am breastfeeding twins?
Yes. Producing milk for two roughly doubles the cost, so add about 900–1,000 calories a day above maintenance rather than 500, with more protein to match. Use the calculator’s exclusive setting and add a further 450–500 calories to the result, and check in with your doctor or a lactation consultant.
Can I do intermittent fasting while breastfeeding?
It is generally not recommended in the first few months, and only with care after that. Long fasting windows make it hard to reach your calorie, protein and fluid needs, and some women see a supply dip. If you try a shorter eating window, keep total calories and fluids up and watch supply and your baby’s weight gain closely.
Related Calculators
- Still pregnant? Pregnancy calorie calculator covers trimester-by-trimester needs.
- Recovering after birth? Postpartum calorie calculator handles recovery whether or not you're nursing.
- Want your baseline? TDEE calculator for women.