Breastfeeding Calorie Calculator
Quick answer
Estimate how many extra calories you need each day while breastfeeding. We start from your usual maintenance calories (Mifflin-St Jeor BMR × activity level) and add the lactation allowance for exclusive or partial breastfeeding.
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How daily needs are calculated
BMR (Mifflin-St Jeor, female) = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
TDEE = BMR × activity factor (1.2 sedentary → 1.9 very active)
Total = TDEE + lactation addition: +500 kcal (exclusive) · +250 kcal (partial)
The +500 kcal figure is the commonly used standard within the IOM / DGA lactation range of about +450–500 kcal/day. Actual needs vary with supply, your baby’s age and your weight goals.
Worked example
- 1
A 30-year-old breastfeeding mother, 165 cm and 62 kg.
- 2
BMR = 10 × 62 + 6.25 × 165 − 5 × 30 − 161 ≈ 1340 kcal/day.
- 3
Lightly active (×1.375): TDEE ≈ 1843 kcal/day.
- 4
Exclusively breastfeeding: ≈ 1843 + 500 ≈ 2343 kcal/day.
How lactation changes your needs
| Your result | Category | What it means |
|---|---|---|
| Exclusive breastfeeding | +450 to +500 kcal/day | Producing a full milk supply is energy-intensive. IOM / DGA guidance centres on roughly +450–500 kcal/day (we use 500) on top of your usual needs. |
| Partial breastfeeding | +250 kcal/day | Mixed feeding — some breastmilk with formula or solids — needs about half the extra energy of exclusive feeding. |
| Over time | Needs ease off | Early months and frequent feeds raise needs; the number dips as solids are introduced and feeds become fewer. |
Lactation add-ons sit on top of your usual TDEE. Needs also shift with your baby’s age, milk supply and how active you are.
Frequently asked questions
Sources & further reading
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Open calculatorThis calculator provides general estimates for informational purposes only and is not medical advice. For personal guidance, consult a qualified healthcare provider.