Pregnancy Calorie Calculator
Estimate how many calories you need each day during pregnancy, adjusted for your trimester, body size, and activity level — with a protein, carb, and fat breakdown based on ACOG and Institute of Medicine guidance.
Calculate your daily calorie needs
Enter your details below. Use your pre-pregnancy weight for the most accurate estimate.
Suggested daily nutrient targets
These figures are general estimates derived from the Mifflin-St Jeor equation plus trimester-specific energy additions recommended by ACOG and the Institute of Medicine. They are not a substitute for individualized advice. Your obstetric provider or a registered dietitian can tailor targets to your health history, weight-gain pattern, and any conditions such as gestational diabetes.
Quick answer
Most people don’t need extra calories in the first trimester. In the second trimester you need roughly +340 calories a day, and in the third trimester about +450 calories a day above your pre-pregnancy needs — figures from the Institute of Medicine that ACOG endorses. Carrying twins raises needs further, to roughly +600–700 calories a day by the second and third trimester, though your OB or a registered dietitian should individualize this for you. For an average woman that works out to roughly 2,200–2,900 kcal/day overall — but your real number depends on your body size, activity, and whether you’re carrying more than one baby.
How many calories do you really need in pregnancy?
“Eating for two” is the most repeated phrase in pregnancy — and one of the most misleading. A growing baby does increase your energy needs, but nowhere near doubling them. The additional energy a pregnancy requires is modest and arrives gradually, mostly in the second half.
Your total daily calorie need is built from two parts: your pre-pregnancy maintenance calories (the energy your body burns to keep you going at your size and activity level) plus a trimester-specific addition for the work of growing the baby, placenta, and supporting tissues. The calculator above adds these together for you, but it helps to understand both pieces.
Your maintenance baseline
This is your basal metabolic rate — the calories burned at rest — multiplied by an activity factor. A taller, more active person needs more; a smaller, more sedentary person needs less.
The pregnancy addition
A small, stage-dependent top-up. It’s effectively zero early on and rises as your baby grows fastest in the third trimester.
Key facts at a glance
The numbers behind pregnancy calorie needs, distilled. These are population reference values — your calculator result personalizes them to your body.
Calorie needs by trimester
The Institute of Medicine and ACOG both describe pregnancy energy needs as rising across the three trimesters rather than as one flat increase. Here’s the widely used reference pattern, on top of your individual pre-pregnancy maintenance calories:
| Stage | Weeks | Extra calories/day | What’s happening |
|---|---|---|---|
| First trimester | 1–13 | ~0 (no routine increase) | Early development needs little extra energy; nausea often reduces intake anyway |
| Second trimester | 14–27 | +340 kcal | Rapid maternal tissue growth, expanding blood volume, steady fetal growth |
| Third trimester | 28–40 | +450 kcal | Fastest fetal weight gain and brain development |
Extra daily calories by trimester
What the extra calories actually look like
The trimester additions sound abstract until you see them as food. The point of these examples is reassurance in both directions: the increase is real and worth meeting, but it’s genuinely small — a snack or two, built from nutrient-dense foods rather than extra treats.
Building the trimester top-up from real food
Second trimester · about +340 kcal
Third trimester · about +450 kcal
How this calculator works
The estimate uses the Mifflin-St Jeor equation, the formula most dietitians consider the most accurate for everyday use. It first calculates your basal metabolic rate (BMR) from your age, height, and pre-pregnancy weight, then scales it by your activity level and adds the trimester energy increase.
The three steps
- Basal metabolic rate (BMR): 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161.
- Maintenance calories: BMR × your activity factor (1.2 sedentary up to 1.725 very active).
- Pregnancy target: maintenance + trimester addition (0, 340, or 450 kcal), with a small extra allowance for twins.
The result is shown as a small range rather than a single number, because real-world energy needs vary day to day and the formula itself carries a margin of error. Use the midpoint as your everyday guide and adjust based on hunger, energy, and your provider’s weight-gain checks.
Not sure how far along you are?
Find your exact week and trimester first, then come back to fine-tune your calorie target.
It’s about quality, not just quantity
Hitting a calorie number is only half the picture. During pregnancy your needs for several nutrients rise much more steeply than your need for calories does — meaning the food those extra calories come from matters more than usual. Nutrient-dense choices let you meet higher demands for folate, iron, calcium, iodine, and choline without excess energy.
Folate
Critical for neural-tube development. Leafy greens, legumes, fortified grains, plus a prenatal supplement as advised.
Iron
Supports expanding blood volume. Lean red meat, beans, lentils, and fortified cereals, paired with vitamin C.
Calcium & vitamin D
Build the baby’s skeleton. Dairy or fortified alternatives, tinned fish with bones, and leafy greens.
Protein, carbs & healthy fats
Within your calorie budget, a balanced split of the three macronutrients supports both you and your baby. The calculator suggests targets using widely accepted pregnancy reference ranges:
| Nutrient | Pregnancy target | Why it matters |
|---|---|---|
| Protein | About 1.1 g per kg body weight (roughly 71 g/day minimum) | Builds fetal tissue, placenta, and maternal blood supply |
| Carbohydrates | At least 175 g/day; ~45–60% of calories | Primary fuel for you and your baby’s brain; fiber aids digestion |
| Fat | About 20–35% of calories | Omega-3s (DHA) support fetal brain and eye development |
A balanced pregnancy plate
A sample day of eating
Here’s how a balanced day might come together for someone in the second trimester targeting roughly 2,200 calories. It’s an illustration of structure and balance — portion sizes and choices should flex to your own targets, preferences, and any dietary needs.
| Meal | Example | Approx. calories |
|---|---|---|
| Breakfast | Oatmeal with milk, berries, and a spoon of nut butter | ~450 kcal |
| Morning snack | Greek yogurt with a banana | ~250 kcal |
| Lunch | Wholegrain wrap with chicken or beans, salad, and avocado | ~550 kcal |
| Afternoon snack | Apple with a small handful of almonds | ~200 kcal |
| Dinner | Salmon or lentils, brown rice, and roasted vegetables | ~600 kcal |
| Evening | A glass of milk or fortified alternative | ~150 kcal |
Eat little and often
Smaller, frequent meals ease nausea, heartburn, and the “no room for food” feeling common in late pregnancy.
Front-load protein
Including protein at each meal helps steady blood sugar and supports the steady tissue-building pregnancy requires.
Hydration counts
Aim for around 8–10 cups of fluid a day; needs rise with your expanding blood volume and in warm weather.
Calories and healthy weight gain
Calorie intake and pregnancy weight gain go hand in hand, and the right amount of gain depends on your pre-pregnancy body mass index (BMI). The Institute of Medicine guidelines below are the standard reference your provider uses:
| Pre-pregnancy BMI | Category | Recommended total gain (single baby) |
|---|---|---|
| Below 18.5 | Underweight | 28–40 lb (12.5–18 kg) |
| 18.5–24.9 | Healthy weight | 25–35 lb (11.5–16 kg) |
| 25–29.9 | Overweight | 15–25 lb (7–11.5 kg) |
| 30 or above | Obese | 11–20 lb (5–9 kg) |
Most of this gain happens in the second and third trimesters — typically about 1 to 2 pounds per week in the later months for someone starting at a healthy weight. The calculator factors your BMI into the weight-gain guidance it shows alongside your calorie target.
Twins, BMI & special situations
Carrying twins
A twin pregnancy needs more energy — often roughly 300 additional calories a day beyond a singleton pregnancy — and a higher recommended weight gain. The calculator adds an allowance when you select twins, but individualized guidance is essential.
Starting overweight or obese
You still need the trimester calorie additions for the baby’s growth, but your maintenance baseline and target weight gain are lower. Pregnancy is not the time for active weight-loss dieting.
Gestational diabetes
Total calories may be similar, but the timing and type of carbohydrate matter enormously. A dietitian-designed plan, not a generic calculator, should guide your intake.
Severe nausea (HG)
If you can’t keep food down, focus on hydration and small frequent intake, and contact your provider. Calorie targets are secondary to preventing dehydration.
Pregnancy calorie myths, debunked
“You’re eating for two, so double your food.”
FactThe extra energy a pregnancy needs peaks at roughly 450 calories a day — about a fifth of an average daily intake, not a second portion of everything.
“You need extra calories from day one.”
FactThe first trimester generally needs no calorie increase at all. The bump in needs starts in the second trimester.
“Cravings tell you exactly what your body needs.”
FactCravings are real but aren’t reliable nutritional signals. A balanced diet plus your prenatal supplement covers needs more dependably.
“Gaining as little as possible is safest.”
FactToo little gain raises the risk of low birth weight and preterm birth. The goal is the right amount for your BMI, not the least.
Frequently asked questions
Dr. Khan reviews all nutrition, weight-gain, and gestational-stage content on PregCalc.com for clinical accuracy against current ACOG, Institute of Medicine, NHS, and Mayo Clinic guidance. Last reviewed: . View reviewer credentials →
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Why Use a Pregnancy Calorie Calculator
A pregnancy calorie calculator helps you understand how your daily energy needs change as your pregnancy progresses, factoring in your trimester, activity level, and pre-pregnancy weight. Getting your calorie intake right supports healthy fetal growth while helping you avoid excessive weight gain. For a broader view of your pregnancy timeline, try our Pregnancy Week by Week guide, and always follow personalized nutrition guidance from your healthcare provider. Learn more about recommended nutrition during pregnancy from the American College of Obstetricians and Gynecologists.