Pregnancy · Nutrition
Pregnancy Calorie Calculator
How many extra calories during pregnancy? Less than you think. NO extra in T1, +340 kcal in T2, +452 kcal in T3 (singleton). Twins ~+600. Breastfeeding +500. Quality > quantity. NICE NG201.
Last reviewed 2 June 2026
Pregnancy calorie needs
Daily calorie target by trimester
Activity level
Trimester
Enter your weight, height and age to see your daily calorie target.
Pregnancy calorie needs by trimester
- T1: NO extra calories.
- T2: +340 kcal/day (singleton).
- T3: +452 kcal/day.
- Twins: ~+600/day from T2.
Breastfeeding calories
- Exclusive: ~500 kcal/day extra.
- ~200 mobilised from fat (helps weight loss); 300 from diet.
- Partial breastfeeding: scale down.
- Postpartum weight loss: ~0.5 kg/week safe; faster reduces supply.
Weight gain target (IOM 2009 singleton)
- Underweight (BMI <18.5): 12.5-18 kg.
- Normal (18.5-24.9): 11.5-16 kg.
- Overweight (25-29.9): 7-11.5 kg.
- Obese (≥30): 5-9 kg.
Nutrient-dense pregnancy foods
- Dark leafy greens.
- Legumes.
- Eggs (choline).
- Dairy.
- Oily fish 1-2/week (low mercury).
- Nuts + seeds.
- Whole grains.
- Berries, citrus, peppers.
Avoid liver (vitamin A toxicity).
Caffeine limit
<200 mg/day. ~1 instant coffee (75), 1 espresso (75), 1 filter (140), 1 cup tea (50), 1 can cola (40).
Key supplements
- Folic acid 400 mcg pre-pregnancy to 12 wk (5 mg if BMI ≥30, T1DM, AEDs, NTD history).
- Vitamin D 10 mcg (400 IU)/day.
- Iron only if anaemic (NICE Hb cutoffs).
- Routine pregnancy multivitamin.
- Vegan: B12, omega-3, calcium, vitamin D, choline focus.
Where weight goes
Average 12.5 kg gain:
- Baby ~3.5 kg.
- Placenta ~0.5 kg.
- Amniotic fluid ~1 kg.
- Uterus ~1 kg.
- Breasts ~0.5 kg.
- Blood ~1.5 kg.
- Interstitial fluid ~1.5 kg.
- Fat stores ~3.5 kg.
Different scenarios
Scenario 1: T1, normal BMI, eating normally
No extra calories needed. Focus on nutrient quality + folic acid.
Scenario 2: T3, BMI 32, weight gain on track
Target 5-9 kg total gain. Smaller extra calorie addition than normal BMI.
Scenario 3: Hyperemesis, struggling to eat
Hydration first. Whatever stays down. Antiemetics. Don’t focus on balanced diet during acute phase.
Scenario 4: Vegan + pregnant
Pregnancy multivitamin essential. Focus B12 + omega-3 + iron + calcium + choline.
Scenario 5: Exclusive breastfeeding, want to lose weight
~500 kcal/day extra; gradual weight loss 0.5 kg/week safe.
Care guidance
- Not eating for two — calorie excess unhelpful.
- Nutrient quality > quantity.
- Caffeine <200 mg/day.
- Folic acid + vitamin D + multivitamin routine.
- Iron only if anaemic.
- Dietitian referral if eating disorder history or vegan / specific needs.
Sources
- NICE NG201. Antenatal care.
- Institute of Medicine 2009. Weight gain in pregnancy.
- NHS. Healthy eating in pregnancy.
Recommended for this calculator
Frequently asked questions
Is pregnancy really not 'eating for two'?
NOT in calorie terms. T1: NO extra calories needed. T2: +340 kcal/day (about a yoghurt + banana with peanut butter). T3: +452 kcal/day (a small extra meal). What DOES roughly double: specific nutrients — folate, iron, choline, iodine, calcium. QUALITY > quantity. TWINS: +600 kcal/day from T2; triplets more.
Why so few extra calories?
Body becomes MORE EFFICIENT during pregnancy at using nutrients. Reduced energy needed for physical activity (often less in 3rd trimester). Stored fat in early pregnancy used in later for milk production. AVERAGE woman: less than people think; INDIVIDUAL needs vary based on baseline weight, activity, BMI, multiples.
What about breastfeeding calories?
FULL BREASTFEEDING: ~500 kcal/day extra. About 200 kcal mobilised from fat stores (helps postpartum weight loss); ~300 kcal extra needed from diet. EXCLUSIVE: full 500 kcal/day. PARTIAL: scale down. POSTPARTUM WEIGHT LOSS: gradual ~0.5 kg/week safe; faster reduces supply. /calculators/breastfeeding-calorie.
What if I'm underweight or overweight?
PRE-PREGNANCY BMI affects gain target (IOM 2009 ranges, singleton): UNDERWEIGHT <18.5: gain 12.5-18 kg; NORMAL 18.5-24.9: 11.5-16 kg; OVERWEIGHT 25-29.9: 7-11.5 kg; OBESE ≥30: 5-9 kg. EXTRA calorie target adjusted accordingly — overweight women need fewer extra calories. INDIVIDUAL guidance from dietitian / GP. /calculators/pregnancy-weight-gain.
Pregnancy 'cravings' — give in or resist?
MIXED. Some research: cravings reflect nutrient needs (calcium / iron from ice cream cravings sometimes); others: cultural / hormonal. STRATEGY: LISTEN with sense — small portions; healthier swap (apple + peanut butter for biscuits sometimes); not RESTRICT entirely. PICA (cravings for non-food — ice, dirt, paper) = check iron status, see GP.
What foods are nutrient-dense for pregnancy?
(1) DARK LEAFY GREENS (spinach, kale) — folate, iron, calcium; (2) LEGUMES (lentils, beans) — protein, iron, folate, fibre; (3) EGGS — choline (brain development), protein; (4) DAIRY — calcium, protein; (5) OILY FISH (salmon, sardines — 1-2 portions/week; avoid high-mercury); (6) NUTS + SEEDS — healthy fats, vitamin E; (7) WHOLE GRAINS — fibre, B vitamins; (8) BERRIES, citrus, peppers — vitamin C + iron absorption. AVOID: liver (vitamin A toxicity).
How does weight gain happen in pregnancy?
AVERAGE 12.5 kg gain (singleton, normal BMI): BABY ~3.5 kg; PLACENTA ~0.5 kg; AMNIOTIC FLUID ~1 kg; UTERUS ~1 kg; BREASTS ~0.5 kg; BLOOD ~1.5 kg; INTERSTITIAL fluid ~1.5 kg; FAT STORES ~3.5 kg (for breastfeeding). TIMING: T1 ~0.5-2 kg; T2 + T3 ~0.5 kg/week typically. /calculators/pregnancy-weight-gain.
Calorie tracking apps — useful?
MIXED in pregnancy. CAN help: identify nutrient gaps; spot under / over-eating; build awareness. RISKS: obsessive tracking; pre-existing eating disorder triggers; missing micronutrients. NICE NG201 doesn't recommend strict tracking — INTUITIVE eating + balanced diet often better. DIETITIAN referral if struggling. /calculators/pregnancy-nutrition.
Hyperemesis — eating despite vomiting?
SEVERE pregnancy sickness — can't keep food / fluids down. PRIORITY: hydration + electrolytes first; small frequent intake of whatever stays down; calorie intake secondary; don't worry about 'balanced'. MEDICAL TREATMENT (antiemetics, IV fluids) often needed. /calculators/hyperemesis-protocol.
Vegan / vegetarian in pregnancy — special considerations?
WORKS WELL with planning. ATTENTION TO: PROTEIN (legumes, tofu, tempeh, quinoa); IRON (with vitamin C for absorption); B12 (fortified foods OR supplement); OMEGA-3 (algae-based DHA); CALCIUM (fortified plant milks, leafy greens, almonds); VITAMIN D (UK winter supplement); CHOLINE. PREGNANCY MULTIVITAMIN important. PRENATAL dietitian helpful. NHS supports vegan pregnancy with right planning.
What about caffeine?
LIMIT TO <200 mg/day (NHS / NICE). Roughly: 1 INSTANT coffee (~75 mg); 1 ESPRESSO (~75 mg); 1 FILTER coffee (~140 mg); 1 cup tea (~50 mg); 1 can cola (~40 mg); 1 50g dark chocolate (~25 mg). EXCESS caffeine associated with miscarriage, low birth weight. DECAF + herbal teas (most) OK. AVOID green tea + caffeine pre-workout drinks.
Iron + supplements — when needed?
(1) ROUTINE pregnancy multivitamin (NHS) — recommended; (2) IRON only if anaemic (NICE): Hb <110 in T1, <105 in T2/T3, <100 postpartum; (3) FOLIC ACID 400 mcg from 3 months pre-pregnancy to 12 weeks; 5 mg if BMI ≥30, diabetes, on AEDs, family history of neural tube defects; (4) VITAMIN D 10 mcg (400 IU)/day; (5) AVOID liver, retinol supplements (vitamin A teratogenic). NEVER 'natural' / high-dose multivitamins without checking.
How does this relate to other calculators on BumpBites?
Companion: /calculators/pregnancy-bmi; /calculators/pregnancy-weight-gain; /calculators/pregnancy-nutrition; /calculators/breastfeeding-calorie; /calculators/water-intake; /calculators/hyperemesis-protocol; /calculators/gdm-ogtt; /calculators/pregnancy-food-safety.