Pregnancy Calorie Needs Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/5/2026
Contrary to the popular idea of "eating for two," the recommended calorie supplement during pregnancy stays modest: about +70 kcal/day in the first trimester, +260 kcal/day in the second trimester, and about +500 kcal/day in the third trimester, added to your usual pre-pregnancy calorie need.
Explanation
The popular phrase "eating for two" during pregnancy is misleading: the real extra energy needs remain modest compared to that image, and increase gradually over the course of pregnancy rather than doubling all at once. According to the French food safety agency ANSES, daily energy needs barely increase in the first trimester (+70 kcal/day, roughly the equivalent of a slice of bread with a bit of cheese), then rise to +260 kcal/day in the second trimester, before reaching their peak in the third trimester — sources consulted here generally cite a figure around +500 kcal/day, with a real gap between references (some citing 450 kcal/day instead), noted explicitly here rather than hidden behind a single figure wrongly presented as perfectly fixed. This calculator takes your usual (pre-pregnancy) calorie need as a starting point — use our daily calorie needs calculator to estimate it if you don't already know it — and simply adds the supplement specific to the current trimester. These benchmarks remain population averages: a twin or multiple pregnancy, a particular activity level, or a specific medical condition (gestational diabetes, for example) may call for an individualized adjustment that only a healthcare professional (midwife, doctor, registered dietitian) can determine while accounting for your full situation.
Example: a 2,000 kcal base need, second trimester
Inputs
Usual calorie need: 2,000 kcal/day. Trimester: 2nd.
Calculation
Estimated total need = 2,000 + 260 (second-trimester supplement) = 2,260 kcal/day.
Result
The estimated daily calorie need for this trimester is about 2,260 kcal.
Frequently asked questions
Do you really need to "eat for two" during pregnancy?
No, this is a widespread misconception that current nutritional guidelines clearly refute. The real extra energy needs are modest, especially early in pregnancy (barely 70 kcal/day in the first trimester), and only increase gradually — far from a doubling of intake.
Why does the third-trimester supplement vary depending on the source consulted?
Because real energy needs depend on many individual factors (activity level, starting weight, weight gain already observed), which is why reference bodies sometimes settle on slightly different estimates (450 to 500 kcal/day depending on the source) for the same population average. This calculator uses 500 kcal/day, a commonly cited value, while flagging this variability rather than hiding it.
Does this calculator work for a twin or multiple pregnancy?
No, these benchmarks correspond to a single pregnancy. A twin or multiple pregnancy involves higher additional energy needs, which should be assessed individually by a midwife, doctor, or registered dietitian rather than estimated using single-pregnancy benchmarks.
How do I know which trimester I'm in?
Pregnancy is counted in weeks of amenorrhea from the last menstrual period: the 1st trimester covers weeks 1 to 14, the 2nd weeks 15 to 28, and the 3rd week 29 through delivery. Our due date calculator directly shows the current week of pregnancy from the date of your last period.